Consulta: creatorFacets:"Kristensen, Troels"
Registros recuperados: 43
Data/hora: 12/06/2024 07:01:37

Environmental life cycle assessment of organic grass protein from multispecies mixtures
Provedor de dados: 21
Autores: Knudsen, Marie Trydeman; Dorca-preda, Teodora; Djomo, Sylvestre Njakou; Kristensen, Troels; Ambye-Jensen, Morten; Møller, Henrik B.; Dupont, Y.L.; Cong, W-F; Eriksen, Jørgen.
Including grass leys in organic arable rotations has potentially several benefits such as suppression of certain weeds, increased biodiversity (i.e. pollinators), increased soil carbon sequestration and productivity among others. The biomass from the grass mixtures can be refined into protein feed concentrate for monogastrics that can partly replace imported soybean, while the fibre fraction can be used as ruminant feed or for biogas. The grass mixtures can also be used directly for biogas. Increasing diversity of the mixtures will potentially also increase the yield stability and the benefits for biodiversity (pollinators), while the number of cuts per year will also have an effect. Thus, the use of multispecies mixtures in organic arable rotation for...
Tipo: Journal paper
Palavras-chave: Air and water emissions; Biodiversity and ecosystem services.
Ano: 2020
URL: http://orgprints.org/35188/1/Knudsen%20et%20al.%20%28manuscript%29%20Environmental%20LCA%20of%20organic%20grass%20protein.doc

Produktionsøkonomi ved økologisk opdræt af Holstein tyre og Limousine x Holstein krydsningstyre og -kvier i et græsbaseret produktionssystem
Provedor de dados: 21
Autores: Munk, Arne; Vestergaard, Mogens; Kristensen, Troels.
Sammenfattende viser resultaterne, at LIM x DH tyre kan opdrættes i et græsbaseret produktionssystem med et forholdsvis fornuftigt restbeløb. Med økologitillæg og forventet slagtepræmie i perioden 2015-2020, kan der opnås et restbeløb til dækning af stald, arbejde og risiko på cirka 1.800 kr. per dyr (ca. 3,50 kr. per dag), selv om der gives et tillæg på 800 kr. per spædkalv i forhold til prisen på en renracet DH-tyr. For LIM x DH kvier kan der opnås et restbeløb på cirka 1.400 kr. per dyr (2,70 kr. per dag). Hvis krydsningstyrene og kvierne ses under et, kan der således opnås et restbeløb på cirka 1.600 kr. per krydsningsdyr (godt 3 kr. per dag) i gennemsnit under de nævnte forudsætninger.  Med et restbeløb på 390 kr. per dyr er der ikke økonomi i at...
Tipo: Report
Palavras-chave: Farm economics; Farming Systems; Beef cattle.
Ano: 2014
URL: http://orgprints.org/27960/7/27960.pdf

Effect of Herbage on Milk Composition
Provedor de dados: 21
Autores: Fretté, Xavier C.; Kristensen, Troels; Eriksen, Jørgen; Søegaard, Karen; Sørensen, John; Nielsen, Jacob H.
A grazing study was performed in 2006 over three two-week periods in May, June and August at the organic research station Rugballegaard, Denmark, where a herd of 48 Holstein dairy cows was split into four groups of 12 cows. Each group grazed one of four swards: 1) lucerne, 2) red clover, 3) white clover and 4) white clover with chicory, all four in mixture with perennial ryegrass. Milk and grass samples were analyzed to study the effect of each sward type on milk composition as well as seasonal variations.
Tipo: Working paper
Palavras-chave: Denmark.
Ano: 2008
URL: http://orgprints.org/14796/1/Artikel_milk%2Dgrass%2Dcomposition%2D2008%2D09%2D23.doc

Phyto-oestrogens in herbage and milk from cows grazing white clover, red clover, lucerne or chicory-rich pastures
Provedor de dados: 21
Autores: Andersen, Charlotte; Nielsen, Tina Skau; Purup, Stig; Kristensen, Troels; Eriksen, Jørgen; Søegaard, Karen; Sørensen, John; Fretté, Xavier C.
A grazing experiment was carried out to study the concentration of phyto-oestrogens in herbage for cattle and in milk during two periods (May and June). Forty-eight Danish Holstein cows were divided into four groups with four treatment diets; white clover, red clover, lucerne and chicory-rich pastures. Each experimental period lasted 15 days. Herbage samples from the first day and individual milk samples from the last day of the experimental period were analysed for phyto-oestrogens using LC-MS technique. The total concentration of phyto-oestrogens was 21 399 mg/kg DM for red clover and 238-466 mg/kg DM for the other three herbages mainly due to a much higher concentration of biochanin A, formononetin and glycitein in red clover. In the milk, the total...
Tipo: Journal paper
Palavras-chave: Health and welfare.
Ano: 2009
URL: http://orgprints.org/16072/1/16072.pdf

Sensory milk properties at the farm level – the terroir dimension
Provedor de dados: 21
Autores: Vestergaard, Jannie S.; Kristensen, Troels; Søegaard, Karen; Bredie, Wender L.P.
In recent years, the Danish milk market has shown an increase in the consumption of organic milk as well as a growing variety of milk with specific features including farm milk. The production of milk from a single farm and pasture-based (PB) feeding regimes is of special interest as it implies a “sense of place” or terroir. The PB feeding regimes vary with season and might also vary on a day-to-day basis. It is therefore important to understand the impact of the feed on the sensory properties of the milk [1].    This study aims at demonstrating how analytical sensory analysis can provide important information about the influence of breed, season and variation in farm management from PB feeding regimes on the sensory properties of organic farm milk. The...
Tipo: Conference paper, poster, etc.
Palavras-chave: Food security; Food quality and human health.
Ano: 2009
URL: http://orgprints.org/16354/2/16354a.pdf

Cows fed vitamin-rich feed produce vitamin-rich milk
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels; Jensen, Søren K.; Søegaard, Karen.
On five organic dairy farms there was a positive effect of a high vitamin content in the home-grown roughage on the vitamin content of the milk produced.   Vitamins and minerals are of crucial importance for the health and performance of the animals, and they also affect the nutritional value of the products. The highest concentrations of pro-vitamin A (in the form of beta-carotene) and vitamin E (alfa-tocopherol) are found in grass, legumes and other green plants, while seeds and whole-crop silage only contain small amounts of vitamins. While the requirements for for fat-soluble vitamins of grazing cattle are normally met via their intake from pasture, the supply of fat-soluble vitamins may decrease to very low amounts when conserved herbage is used...
Tipo: Newspaper or magazine article
Palavras-chave: Farming Systems; Animal husbandry; Feeding and growth; Farm nutrient management.
Ano: 2010
URL: http://orgprints.org/17870/1/17870.pdf

Dairy cow defecation and urination frequency and spatial distribution in relation to time-limited grazing
Provedor de dados: 21
Autores: Oudshoorn, Frank; Kristensen, Troels; Nadimi, Esmaeil.
The objective of this paper was to investigate the effect of limited grazing time on urination and defecation frequency, spatial distribution of excrement in the paddock, and the resulting nitrogen balance at animal and field level. During a 6-week period in early summer, 60 Holstein Frisian dairy cows (31.0±5.4 kg ECM) were randomly allocated to three different treatments, with grazing at clover-grass pasture during daytime for 4, 6.5 or 9 h daily. Indoor feeding, with a mixture of roughage and concentrates (13% crude protein), was restricted for treatment 4 and 6.5 h to the amount the 9-h treatment could eat. Cows allowed grazing at pasture for 4 h moved more rapidly during pasture, moved longer distance per active hour and used a higher proportion of...
Tipo: Journal paper
Palavras-chave: Dairy cattle; Air and water emissions.
Ano: 2008
URL: http://orgprints.org/13856/1/13856.pdf

Mælkens indholdsstoffer ved afgræsning
Provedor de dados: 21
Autores: Larsen, Mette Krogh; Nielsen, Jacob Holm; Kristensen, Troels; Søegaard, Karen; Eriksen, Jørgen.
Forsøgene viser hvordan mængden af afgræsning har betydning for mælkens sammensætning, og denne effekt er væsentlig højere for Holstein køer end for Jersey. Specielt skal bemærkes, at det ved øget afgræsning er muligt at øge mælkens indhold af linolensyre for Holstein, hvilket ikke er tilfældet for Jersey. Mælkens E-vitaminindhold øges ligeledes ved afgræsning, og dermed opnås en vis beskyttelse mod oxidation af den højere andel af umættet fedt.
Tipo: Report chapter
Palavras-chave: Farming Systems; Animal husbandry; Feeding and growth; Farm nutrient management.
Ano: 2010
URL: http://orgprints.org/17917/1/17917a.pdf

Effect of grazing white clover pasture on milk composition of Holstein and Jersey cows
Provedor de dados: 21
Autores: Fretté, C.; Kristensen, Troels; Eriksen, J.; Søegaard, Karen; Sørensen, John; Wiking, L.; Nielsen, J.H.
Because of its high saturated fatty acid (FA) content milk fat is considered hypercholesterolemic. Intake of unsaturated FA (UFA) reduces the plasma cholesterol concentrations. Especially conjugated linoleic acids (CLA) have shown positive effects on cardiovascular diseases, prevention of cancer and obesity. The aim of our project is to investigate how grazing can enhance the content of these beneficiary FA in milk. For bith types of cow races we observed no direct effect of increased grazing in the diet on the short chain FA (SCFA) content in milk, implying that the de novo synthesis of these FA remained unaffected. Regarding the content of CLA c9,t11 there was a strong positive effect on Holstein milk (R2 = 0,88), but almost none on Jersey milk when the...
Tipo: Conference paper, poster, etc.
Palavras-chave: Food security; Food quality and human health Feeding and growth.
Ano: 2009
URL: http://orgprints.org/16366/1/16366.pdf

Indirekte beregning af N-fiksering
Provedor de dados: 21
Autores: Kristensen, Ib Sillebak; Dalgaard, Randi; Kristensen, Troels.
Indirekte beregning af N-fiksering dels ud fra målt udbytte af bælgplantetørstof, dels ud fra bedømt kløverdækning og dels ud fra ukendt kløverandel.
Tipo: Report chapter
Palavras-chave: Nutrient turnover Farming Systems Pasture and forage crops Cereals; Pulses and oilseeds.
Ano: 2002
URL: http://orgprints.org/295/1/NFIX_red_ISK.doc

CLA-indhold i komælk
Provedor de dados: 21
Autores: Refsgaard Andersen, Henning; Sejrsen, Kristen; Sørensen, Martin Tang; Kristensen, Troels; Straarup, Else Marie.
Foreløbig konklusion  CLA-indholdet i mælk fra forskellige besætninger vil i staldfodringsperioden typisk variere mellem 0,3 og 0,8 g pr. 100 g fedtsyrer. Indholdet kan dog øges helt op til 1,8 g pr. 100 g fedtsyrer ved fodring med meget store mængder umættet fedt (solsikkefrø). Ligeledes er det dokumenteret, at CLA-indholdet er betydeligt højere hos køer på græs end hos staldfodrede dyr
Tipo: Web product
Palavras-chave: Dairy cattle.
Ano: 2003
URL: http://orgprints.org/1348/1/Artikkel_CLA.doc

Extended lactation may improve cow health and productivity and reduce greenhouse gas emission from organic dairy cows
Provedor de dados: 21
Autores: Lehmann, Jesper Overgård; Mogensen, Lisbeth; Kristensen, Troels.
The concept of extended lactation is supposed to improve cow health and productivity and at the same time reduce greenhouse emission from high-yielding organic dairy cows in a product perspective. This effect is achieved through fewer calvings per year and hence a production of fewer replacement heifers, which then reduces the annual herd requirement for feed. We believe that the average milk yield per feeding day – days lactating plus days dry – per cow will be unchanged. However, this requires that the average cow will have to produce milk for a longer timeframe, and thus they will become older before being culled. We believe this will be a derived effect of the improved cow health as the majority of disease incidences occur around the time of calving....
Tipo: Conference paper, poster, etc.
Palavras-chave: Production systems; Dairy cattle; Air and water emissions.
Ano: 2014
URL: http://orgprints.org/23572/1/23572_MM.pdf

Økologisk mælkeproduktion - reduceret foderniveau og strategisk anvendelse af tilskudsfoder
Provedor de dados: 21
Autores: Sehested, Jakob; Kristensen, Troels.
På den økologiske forsøgsstation Rugballegaard blev der i 1996 etableret tre produktionssystemer omfattende husdyr og sædskifte. Formålet var at belyse de overordnede bedriftsmæssige konsekvenser af økologiske produktionssystemer med kombinationer af kvæg og svin i forhold til specialiseret produktion af kvæg henholdsvis svin.  Dette indlæg omhandler resulter vedrørende køerne og mælkeproduktionen. Formålet med forsøgene med malkekvægbesætningen var at undersøge malkekøernes produktion, reproduktion, sundhed og foderudnyttelse  samt mælkens kvalitet, når køerne blev fodret på et reduceret niveau med grovfoder alene (primært frisk og/eller konserveret kløvergræs) eller suppleret med små mængder tilskudsfoder først i laktationen.
Tipo: Conference paper, poster, etc.
Palavras-chave: Dairy cattle.
Ano: 2001
URL: http://orgprints.org/111/1/Microsoft_Word_%2D_Okotema_2001.pdf

Økologisk mælkeproduktion:  Resultater fra forsøg med selvforsyning med økologisk foder
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels.
Ved ad libitum foder med en stor andel kløvergræsensilage af god kvalitet gav en ration med byg som tilskudsfoder den samme ydelse som en ration med rapskage og byg . Ved en mindre gunstig grovfodersituation var der en stor effekt af en A-blanding som tilskudsfoder i stedet for byg. Selv ved en stor andel ad libitum foder af god kvalitet kunne grønpiller af standard kvalitet erstatte byg på tørstofbasis uden at EKM-ydelsen faldt signifikant. Ved samme areal til rådighed pr. ko, resulterer dyrkning af raps, byg og hvede og efterfølgende fodring med valsede rapsfrø og byg/hvede i en ændret sammensætning af mælken, men samme eller højere EKM-ydelse sammenlignet med dyrkning af og fodring med byg.
Tipo: Report chapter
Palavras-chave: Dairy cattle.
Ano: 2001
URL: http://orgprints.org/1654/1/Maelkeprod.doc

Carbon footprint from cheese produced on milk from Holstein and Jersey cows feed hay differing in proportion of herbs
Provedor de dados: 21
Autores: Kristensen, Troels; Søegaard, Karen; Eriksen, Jørgen; Mogensen, Lisbeth.
The objective of the study was to assess the impact on emission of green house gasses (GHG) from production of cheese based on milk from different type of hay and breed of cows, and as an integrated part to give figures for emission from production of hay in climate lees favorable for on field hay drying. Emission of GHG was estimate using life cycle assessment with kg of milk and kg of energy corrected milk (ECM) delivered to the dairy factory, and kg of cheese at the retailor level in Denmark as functional units. Allocation at farm gate, between milk and meat, was made by biological relation between energy requirement to milk and meat production or economic allocation and at the dairy between cheese and whey using either economic allocation or system...
Tipo: Journal paper
Palavras-chave: Production systems; Farm economics; Air and water emissions; Biodiversity and ecosystem services.
Ano: 2014
URL: http://orgprints.org/26477/7/26477.pdf

Effect of barley or rape seed cake as supplement to silage for high-yielding organic dairy cows
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels.
An experiment was carried out to investigate the effects of barley or rape seed cake as supplement to silage given ad libitum on milk production and health of dairy cows. A total of 103 cows were divided into two groups on two farms. Before the experiment, the cows had an average milk yield of  26.9 kg ECM and they were in milk for an average of 99 days. Their average parity was 2.3 and their weight 596 kg. The cows in each group received either solely barley or an isoenergetic mixture of rape cake seed and barley as supplement. The supplement feed was fed frequently by automatic feeding. A mixture of clover grass silage and whole crop silage was fed ad libitum.    The daily milk yields were not significantly different in the barley and rape seed cake...
Tipo: Journal paper
Palavras-chave: Dairy cattle.
Ano: 2002
URL: http://orgprints.org/1342/1/Acta_LIM_2002_52.pdf

Tilskudsfoder til vinterfodringen af økologiske malkekøer
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels; Sehested, Jakob.
Kapitlet omhandler tilskudsfoder til en vintergrundration, som primært består af kløvergræsensilage. Resultaterne er baseret på en række forsøg på Studielandbrug og Den Økologiske Forsøgsstation Rugballegård. Korn indgår i alle delforsøgene som den ene behandling i sammenligning med tilskudsfodermidler, som bidrager med en større mængde protein, fedtsyrer eller cellevægge. I nogle forsøg er tilskudsfodermidlerne substitueret på grundlag af fylde, og i andre på grundlag af udbyttet på et givet areal. Proteinrige tilskudsfodermidler gav ved en grundration med højt stivelsesindhold og lav proteinværdi samme eller højere energikorrigerede mælkeydelse end byg. Ved kvotebegrænsning var mælkeindtægten stort set uafhængig af, hvilket tilskudsfoder der blev...
Tipo: Report chapter
Palavras-chave: Production systems.
Ano: 2002
URL: http://orgprints.org/200/1/Microsoft_Word_%2D_nr_17_kap_3.pdf

Estimering af hvidkløver i afgræsningsmarken
Provedor de dados: 21
Autores: Kristensen, Troels; Søegaard, Karen.
Andelen af hvidkløver i afgræsningsmarker bestemt ved visuel vurdering overvurderer indholdet af hvidkløver i forhold til botanisk bestemmelse baseret på planteprøver som håndsorteres. Forskellen er størst i foråret ved lille afgræsningshøjde. Ved bedømmelser af hvidkløverandelen ved 20 til 50 stikprøver fordelt tilfældigt på større arealer kan den visuelt bestemte kløverandel omregnes til botanisk bestemt indhold ved de udledte ligninger, med en sikkerhed på 2-3%-enheder.
Tipo: Working paper
Palavras-chave: Pasture and forage crops.
Ano: 2010
URL: http://orgprints.org/18058/1/18058.pdf

Afgræsning af græsblandinger med bælgplanter og cikorie
Provedor de dados: 21
Autores: Kristensen, Troels; Eriksen, Jørgen; Søegaard, Karen.
Græsblandinger med hvidkløver, rødkløver, lucerne og cikorie havde alle en god foderkvalitet og gav mulighed for en høj produktion af differentieret mælk ved betydelig grad af afgræsning. Det kræver afgræsningssystemer tilpasset den enkelte græsblanding at få en optimal produktion.
Tipo: Newspaper or magazine article
Palavras-chave: Farming Systems.
Ano: 2007
URL: http://orgprints.org/10845/1/10845.pdf

Animal health and nutrition in organic farming
Provedor de dados: 21
Autores: Vaarst, Mette; Weisbjerg, Martin Riis; Kristensen, Troels; Thamsborg, Stig Milan; White, Andrew; Roderick, Stephen; Lockeretz, Willie.
Animals are important in organic farming systems, both as a part of the concept and in practice, where there is great weight on forming an integrated system with harmony between the land, the animals and the people, involving local recirculation of feed and manure. Good animal health and welfare is an important goal for organic husbandry. In contrast to crops, animals are not just parts of the farming system, they are also sentient creatures and as such they deserve special moral consideration. They are individuals that need to be cared for, they can suffer, and they can interact with each other and with the humans and environment around them. Animal management is, therefore, very different from crop management. Humans have a moral obligation to treat...
Tipo: Book chapter
Palavras-chave: Health and welfare.
Ano: 2006
URL: http://orgprints.org/13735/1/13735.pdf

Udfordringer i produktion af urtehø
Provedor de dados: 21
Autores: Søegaard, Karen; Kristensen, Troels.
Organic RDD projektet EcoServe har afdækket nogle udfordringer i produktionen af ur-tehø; nemlig at begrænse marktab og energiforbrug til tørring samt at optimere foder-kvaliteten.
Tipo: Newspaper or magazine article
Palavras-chave: Pasture and forage crops.
Ano: 2013
URL: http://orgprints.org/24761/7/24761.pdf

Græs i sædskiftet - effekt af afstande og belægning
Provedor de dados: 21
Autores: Tvedegaard, Niels; Kristensen, Ib Sillebak; Kristensen, Troels.
Udviklingen inden for den økologiske kvægproduktion resulterer i større bedrifter. En ofte afledt effekt af udviklingen er, at afgræsning med malkekøer ikke er mulig på en del bedriftens arealer pga. store afstande og eller fysiske forhindringer i form af veje mellem mark og stald-faciliteter, hvorfor det er en særlig udfordring at udnytte græsmarken via afgræsning og at sikre en hensigtsmæssig placering af græsmarkerne i sædskiftet til sikring af bedriftens produktion, økonomi og næringsstofomsætning.  Til understøttelse af den strategiske rådgivning og beslutningstagen er der derfor udarbejdet et modelværktøj med fokus på denne problemstilling. I det følgende er beskrevet model forudsætninger og vist enkelte resultater af udvalgte scenarier. Modellen er...
Tipo: Report chapter
Palavras-chave: Farming Systems; Animal husbandry; Feeding and growth; Farm nutrient management.
Ano: 2010
URL: http://orgprints.org/17919/1/17919.pdf

Integrated forage and livestock production
Provedor de dados: 21
Autores: Hermansen, John E.; Kristensen, Troels.
Integrated forage and livestock production can be considered at the farm level and at the herd or animal level. At the farm level it is relevant to consider the overall utilization of N in the system in relation to crops and livestock. It is demonstrated that in organic dairy production a high transformation efficiency of N from input to edible products can be achieved compared, with conventional production. In addition, combining dairy and pig production allows an even higher N utilization. At the herd level the quality of grass or clover-grass based forage is extremely important. This holds for the overall intake and milk production in dairy cows and for the intake of clover-grass by grazing sows. In addition the composition of the sward should be...
Tipo: Conference paper, poster, etc.
Palavras-chave: Production systems.
Ano: 2004
URL: http://orgprints.org/2862/1/2862.pdf

Malkekvæg som dynamo for en alsidig udvikling af økologisk jordbrug
Provedor de dados: 21
Autores: Kristensen, Troels; Kristensen, Ib Sillebak; Sehested, Jakob.
I kapitlet beskrives tre produktionssystemer, som har kørt på Den Økologiske Forsøgsstation Rugballegård gennem tre år: 1) Mælkeproduktion, 2) Svineproduktion samt 3) Kombineret produktion af svin og kvæg, hvor køerne tildeles et reduceret niveau af tilskudsfoder. Kvægbesætningen blev således delt i to hold: N på normalt foderniveau, som afspejlede det rene mælkeproduktionssystem; og L på lavt foderniveau, som afspejlede kombinationssystemet, hvor det energirige foder blev brugt til svineproduktionen. Systemerne er beskrevet gennem modelberegninger og gennem resultater fra Rugballegård. Modelberegningerne viser den højeste gennemsnitlige afgrødeproduktion på 5650 kg ts per ha i kvægsædskiftet (tilhørende malkekvæg på normalt foderniveau) mod 3250 kg ts per...
Tipo: Report chapter
Palavras-chave: Production systems.
Ano: 2002
URL: http://orgprints.org/202/1/Microsoft_Word_%2D_nr_17_kap_4.pdf

COMPARISON OF GROWTH PERFORMANCE OF BEEF CALVES FROM DIFFERENT GENETIC STRAINS REARED UNDER ORGANIC CONDITIONs (D. 3.2)
Provedor de dados: 21
Autores: Cakmakci, Cihan; Jørgensen, Kirstine F.; Kristensen, Troels; Kargo, Morten; Vestergaard, Mogens.
The objective of the present study was to compare growth performance of 15 Danish Holstein bull (DHB) calves, 15 Limousine x Danish Holstein crossbred bull (CB) calves and 15 Limousine x Danish Holstein crossbred heifer (CH) calves reared under organic conditions. Spring-born calves were puchased at private farms and arrived at approximately 20 days of age with an average initial body weight of 52.9, 58.5 and 56.1 kg, (SEM 2.6) for DHB, CB and CH, respectively. Calves were kept indoor until weaning at 3 months of age. Calves were gradually introduced to a grass-silage based ration from 3 to 4 months of age. From 4 to 7 months calves were kept on mix grass pasture of ryegrass and white clover. There were significant differences between treatment groups in...
Tipo: Working paper
Palavras-chave: Beef cattle.
Ano: 2013
URL: http://orgprints.org/24695/3/24695.pdf

Effect of concentrate supplementation level on production, health and efficiency in an organic dairy herd
Provedor de dados: 21
Autores: Sehested, Jakob; Kristensen, Troels; Søegaard, Karen.
The proportions of organic feed and roughage in the feed ration for organic dairy cows have to reach 100 and 60%, respectively, in 2005. The aim of this study was to elucidate the long-term effects of reducing or omitting concentrate supplementation to high genetic merit dairy cows on a basal ad libitum diet of clover-grass (silage and grazing). Three concentrate levels, N, L and L+ (38, 0 and 19% of dry matter (DM) intake, respectively) were investigated in a herd of 60 cows during 3 years. The production in group N was 6723 kg energy corrected milk (ECM) per cow year, based on an intake of 6226 kg DM of which 38% was concentrates. In group L the omission of concentrates reduced intake to 4770 kg DM, and milk production to 5090 kg ECM per cow year. Milk...
Tipo: Journal paper
Palavras-chave: Dairy cattle.
Ano: 2003
URL: http://orgprints.org/1344/1/livestock_rugballegaard.pdf

Introduktion - perspektiver ved 100 pct. økologisk fodring
Provedor de dados: 21
Autores: Kristensen, Troels; Sehested, Jakob.
I kapitlet skitseres den økologiske mælkeproduktion i Danmark samt de gældende og kommende rammer herfor. Desuden diskuteres perspektiverne i en økologisk mælkeproduktion baseret på 100% økologisk foder. Mælkeproduktionens omfang er gennem en kraftig vækst nået op på ca. 10% af den indvejede mælk i 2000. Markedet ser på kort sigt ud til at nærme sig en mætning, hvilket afspejler sig i en faldende merpris til producenten. Der identificeres to overordnede tendenser i udviklingen af produktionen inden for rammerne af 100% økologisk fodring: Den ene med en fastholdelse af de nuværende mål omkring produktionsniveau mv. per dyr, opnået ved en tilpasning af grovfoderkvalitet og økologisk dyrket tilskudsfoder. Den anden trend med en drejning mod en mælkeproduktion...
Tipo: Report chapter
Palavras-chave: Production systems.
Ano: 2002
URL: http://orgprints.org/201/1/Microsoft_Word_%2D_nr_17_kap_1.pdf

Græsmarkens sammensætning og mælkens smag
Provedor de dados: 21
Autores: Kristensen, Troels; Eriksen, Jørgen; Søegaard, Karen.
Enclosed files were presented at workshop april 3rd 2008
Tipo: Report
Palavras-chave: Crop combinations and interactions; Feeding and growth.
Ano: 2008
URL: http://orgprints.org/19690/1/19690a.pdf

Arealforbrug og emission af drivhusgas ved græsbaserede oksekødsproduktionssystemer
Provedor de dados: 21
Autores: Kristensen, Troels.
Arealforbruget og udledningen af drivhusgasser udgør en af de store udfordringer for fødevareproduktionen. Som supplement til de driftsøkonomiske analyser (Munk et al., 2014) er der således lavet en beregning af arealforbrug og udledning af drivhusgasser per kg kød produceret ved tre alternativer økologiske oksekødsproduktionssystemer.
Tipo: Report
Palavras-chave: Farm economics; Food systems.
Ano: 2015
URL: http://orgprints.org/28076/7/28076.pdf

A decision support model simulating the vitamin supply over the year on a farm
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels; Jensen, Søren K.
The aim of this new project is to develop a prototype of a decision support model simulating the feed and vitamin supply during a year to different groups of animals (calves, heifers, dry cows, cows in early and late lactation) on a farm self-sufficient with feed. The model takes into account that the content of vitamin depends on choice of crops, utilization method, cutting date, conservation method and duration of storage together with traditional optimizing the feed-ing scheme.
Tipo: Conference paper, poster, etc.
Palavras-chave: Dairy cattle.
Ano: 2006
URL: http://orgprints.org/7418/1/FOJO_kongress_2006_paper.pdf

Besætningens forsyning med vitaminer og mineraler – case studier og model
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels; Jensen, Søren K.; Søegaard, Karen.
I FØJO3 projektet ECOVIT undersøges, hvorvidt det er muligt for en bedrift med økologisk mælkeproduktion at blive  selvforsynende med vitaminer og mineraler. I projektet indgik et samarbejde med 5 private gårde med mælkeproduktion. På disse gårde blev der fundet en positiv   sammenhæng mellem indholdet af vitaminer i det producerede grovfoder og indholdet i den mælk, der blev produceret heraf. Der er udviklet en model til at beregne det forventede indhold af vitaminer (fokus på A og E) og mineraler (fokus på Cu, Zn og Se) i hjemmeavlet foder som funktion af de faktorer, der påvirker indholdet. Med udgangspunkt i fodringsdata fra en af bedrifterne beregnes vha. modellen indholdet af vitaminer og mineraler i foderet, og der opstilles scenarier for, hvordan...
Tipo: Report chapter
Palavras-chave: Farming Systems; Animal husbandry; Feeding and growth; Farm nutrient management.
Ano: 2010
URL: http://orgprints.org/17916/5/17916a.pdf

Effect of dairy management on quality characteristics of milk
Provedor de dados: 21
Autores: Slots, Tina; Leifert, Carlo; Butler, Gillian; Kristensen, Troels; Nielsen, Jacob Holm.
The objective of the study was (i) to compare the nutritional composition of milk produced in organic and conventional production systems taking into consideration: different proportions of grass or grass silage, maize silage and different amount of concentrate (cereals), and (ii) to define the variation in content of pro- and antioxidants in milk in relation to regional variation, feeding and season. The feeding regime from 25 farms from Denmark, 20 farms from Sweden and 25 farms from United Kingdom was reg-istered and milk samples were collected and analysed for the content of antioxidants and fatty acid compo-sition. The daily milk production was significantly higher in the conventional milk production systems in the two Scandinavian countries compared...
Tipo: Conference paper, poster, etc.
Palavras-chave: Food security; Food quality and human health Farm nutrient management Health and welfare.
Ano: 2006
URL: http://orgprints.org/7631/1/Tina%2DSlots.doc

Alfa-tocopherol and beta-carotene in roughages and milk in organic dairy herds
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels; Søegaard, Karen; Jensen, Søren K.; Sehested, Jakob.
The aim of the present study was to increase our knowledge about the vitamin content in roughage at harvest and during storage on organic commercial farms and to analyze the vitamin content in the milk. Roughages produced at the five organic dairy farms were monitored from harvest when the silage was laid in the silo and until the roughage was fed during the winter. The roughages had average α-tocopherol and β-carotene contents during the feeding period of, respectively, 30 mg and 21 mg per kg DM in grass-clover silage (after 281 days at storage), 13 mg and 8 mg per kg DM in maize wholecrop silage (stored for 194 days) and 28 mg and 9 mg per kg DM in cereal wholecrop silage (after 210 days from ensiling to feeding).   The average daily intake of...
Tipo: Journal paper
Palavras-chave: Dairy cattle; Feeding and growth.
Ano: 2011
URL: http://orgprints.org/19448/7/19448.pdf

Organic dairy production based on rapeseed, rapeseed cake or cereals as supplement to silage ad libitum
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Ingvartsen, Klaus L.; Kristensen, Troels; Seested, Susanne; Thamsborg, Stig M.
This experiment presents the effect of 100% organic feed rations grown at an equal area per cow on milk production performance and metabolic responses. A total of 174 Danish Holstein cows were included in two experiments on two commercial organic dairy farms during the winter 2000/2001. Three types of supplementary feed were examined: 5 kg cereals, 3 kg rapeseed/cereal pellet or 1 kg rapeseed cake fed with a mixture of clover grass silage, whole crop silage and grass pellets ad libitum. The supplement of rapeseed/cereal pellet compared with cereals tended to decrease both milk fat and protein content, whereas fat and protein yield were unaffected. Milk yield was increased by supplement of rapeseed/cereal pellet compared with cereals in experiment 1, but...
Tipo: Journal paper
Palavras-chave: Dairy cattle.
Ano: 2004
URL: http://orgprints.org/4682/1/4682.pdf

Mælkeproduktion baseret på 100 procent økologisk dyrket foder
Provedor de dados: 21
Autores: Kristensen, Troels; Sehested, Jakob.
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Tipo: Journal paper
Palavras-chave: Animal husbandry.
Ano: 2001
URL: http://orgprints.org/110/1/Microsoft_Word_%2D_Artikel_landsbl_maj_2001.pdf

Developments in greenhouse gas emissions and net energy use in Danish agriculture - How to achieve substantial CO2 reductions?
Provedor de dados: 21
Autores: Dalgaard, Tommy; Olesen, Jørgen E.; Petersen, B.M.; Petersen, Søren O.; Jørgensen, Uffe; Kristensen, Troels; Hutchings, Nicholas J.; Gyldenkerne, Steen; Hermansen, J.E.
Greenhouse gas (GHG) emissions from agriculture are a significant contributor to total Danish emissions. Consequently, much effort is currently given to the exploration of potential strategies to reduce agricultural   emissions. This paper presents results from a study estimating agricultural GHG emissions in the form of methane, nitrous oxide and carbon dioxide (including carbon sources and sinks, and the impact of energy consumption/bioenergy production) from Danish agriculture in the years 1990-2010. An analysis of possible measures to reduce the GHG emissions indicated that a 50-70% reduction of agricultural emissions by 2050 relative to 1990 is achievable, including mitigation measures in relation to the handling of manure and fertilisers,...
Tipo: Journal paper
Palavras-chave: Nutrient turnover; Air and water emissions; Buildings and machinery; Landscape and recreation; Farm nutrient management.
Ano: 2011
URL: http://orgprints.org/19044/4/19044.pdf

Flere vitaminer i grovfoder giver flere vitaminer i mælken
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels; Jensen, Søren K.; Søegaard, Karen.
På 5 økologiske gårde med mælkeproduktion blev der fundet en positiv sammenhæng mellem indholdet af vitaminer i det producerede grovfoder og indholdet i den mælk, der blev produceret heraf.   Vitaminforsyningen er af stor vigtighed for køernes sundhed og trivsel, ligesom den har stor indflydelse på den producerede mælks ernæringsmæssige kvalitet. Det højeste indhold af vitaminer findes normalt i friske grønne blade på afgrøderne. For malkekvæg kan der derfor være problemer med at sikre forsyningen med de fedtopløselige vitaminer i vinterperioden, hvor fodret består af konserverede og lagrede fodermidler, mens køer på græs i sommerperioden oftest vil få vitaminbehovet opfyldt.  I FØJO III projektet EcoVit blev de to vigtigste partier grovfoder på hver af...
Tipo: Newspaper or magazine article
Palavras-chave: Animal husbandry; Feeding and growth; Farm nutrient management.
Ano: 2010
URL: http://orgprints.org/17869/1/17869.pdf

Content of fatty acids, vitamin E and carotenoids in milk  and herbage as affected by sward composition and period of  grazing
Provedor de dados: 21
Autores: Larsen, Mette Krogh; Fretté, Xavier C.; Kristensen, Troels; Eriksen, J.; Søegaard, Karen; Nielsen, J.H.
The quality of organic milk is affected by feed composition, and especially the high use of legumes has been identified as the reason for high levels of polyunsaturated fatty acids, carotenoids and tocopherols in organic milk.     Four different pastures composed of mainly white clover (WCL), red clover (RCL), lucerne (LUC) or chicory (CIK), respectively, were established to investigate the influence of sward composition on the milk quality of grazing cows. On three occasions during the grazing period (May, June and August), groups of 12 Holstein cows were grazing the pastures for two weeks. About 70% of the daily dry matter intake was pasture, and the remaining dry matter intake was a mixture of oats, hay and minerals (82%, 16%, 2%, respectively). The...
Tipo: Conference paper, poster, etc.
Palavras-chave: Food security; Food quality and human health.
Ano: 2011
URL: http://orgprints.org/18887/4/18887.pdf

Så meget koster øko-hømælk at producere
Provedor de dados: 21
Autores: Tvedegaard, Niels; Kristensen, Troels.
”Hømælk” er mælk fra køer hvor foderensilagen er skiftet ud med hø. Det foderskifte koster penge! Produktionen kræver fx faciliteter til håndtering og tørring af høet, græsudbyttet i marken falder, der er omkostninger til energi ved nedtørringen og mælkeydelsen falder lidt. Den samlede meromkostning for landmanden er beregnet til ca. 60 øre pr kg mælk. Landmændene oplever til gengæld velfærd i staldene og arbejdsglæde ved produktionsformen.
Tipo: Journal paper
Palavras-chave: Production systems; Farm economics; Biodiversity and ecosystem services.
Ano: 2014
URL: http://orgprints.org/26478/7/26478.pdf

Prototyping of organic dairy production systems self-sufficient with feed – consequences on productivity, environment and economy
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels; Danfær, Allan.
In 2005, 100% organically grown feed become a requirement for all organic dairy cows in EU. To create a better understanding of which effect introducing 100% organically grown feed will have on the whole farming system, six production strategies was set up and the effects on productivity, environment effect and economy were analysed. The strategies differ with respect to type of concentrated feed, level of fresh grass-clover in the ration and length of the calving interval. It was found that supplement of cereal, rapeseed/cereals or grass pellets gave very similar productivity and economic result, but supplement of rapeseed cake reduced crop production and economic result. Increased level of grazing has a smaller positive effect on the economic result. On...
Tipo: Journal paper
Palavras-chave: Dairy cattle.
Ano: 2007
URL: http://orgprints.org/6033/1/6033.doc

Bedriftens økonomi, produktivitet og ressourceforbrug ved forskellige strategier for selvforsyning med foder
Provedor de dados: 21
Autores: Mogensen, Lisbeth; Kristensen, Troels.
Forbedres grovfoderkvaliteten, via øget andel kløvergræs, stiger såvel foderoptagelsen som mælkeydelsen per ko per år og der opnås en meget positiv effekt på bedriften økonomien. Modelberegninger viser imidlertid også at kvælstofoverskud per ha i stiger dette system, med deraf øget risiko for kvælstofudvaskning. Som en konsekvens heraf er der behov for at se kritisk på den traditionelle ompløjning af græsmarkerne efter 2 til 3 år, frem for mere længerevarende marker.
Tipo: Report chapter
Palavras-chave: Production systems.
Ano: 2005
URL: http://orgprints.org/4706/1/4706.pdf

Parameters affecting the environmental impact of a range of dairy farming systems in Denmark, Germany and Italy
Provedor de dados: 21
Autores: Guerci, Matteo; Knudsen, Marie Trydeman; Bava, Luciana; Zucali, Maddalena; Schönbach, Philipp; Kristensen, Troels.
The environmental impact of 12 dairy farms in Denmark, Germany and Italy was evaluated using an LCA approach and the most important parameters influencing their environmental sustainability were identified. The farms represent different production methods (organic vs. conventional), summer feeding systems (confinement vs. pasture) and annual production levels (6275–10,964 kg ECM cow−1). There was large variability in stocking rates (1.1–11.0 LU ha−1) among farms, which has a major impact on the production per unit area of farmland, on feed self-sufficiency and on farm surplus of nitrogen. The proportion of grassland on farmland used for forage production or pasture varied from 0 to 100%. The lowest global warming potential (GWP), acidification,...
Tipo: Journal paper
Palavras-chave: Dairy cattle; Air and water emissions; Biodiversity and ecosystem services.
Ano: 2013
URL: http://orgprints.org/22798/7/22798.pdf

BRIDGING THE GAP BETWEEN FARMERS AND CONSUMERS: VALUE CREATION AND MEDIATION IN “PASTURE-RAISED BEEF” FOOD NETWORKS
Provedor de dados: 31
Autores: Bedoin, Florence; Kristensen, Troels; Noe, Egon.
The aim of this article is to explore how different quality dimensions (safety, aesthetics, ethics and rooted ness) are created in food networks; how these qualities are transferred until the consumers; and how this process is supported by the organisation of the food network. Our postulate is that combining the quality and organisation dimensions and exploring the link between them will provide an interesting perspective for improving the sharing of values in food networks. This framework is applied to five case studies of “pasture-raised beef” food networks in France, representing a diversity of organisations such as public label scheme, cooperate owned brand and direct sell from farmer to consumer. The results highlight the importance of the role of...
Tipo: Conference Paper or Presentation
Palavras-chave: Grassland; Meat quality; Sustainability; Food labeling; Case study; Agricultural and Food Policy; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety.
Ano: 2009
URL: http://purl.umn.edu/57475