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