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| Registros recuperados: 43 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 43 | |
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