Effects of lipid-encapsulated conjugated linoleic acid supplementation on milk production, bioenergetic status and indicators of reproductive performance in lactating dairy cows
dc.contributor.author | Hutchinson, Ian A. | * |
dc.contributor.author | de Veth, Michael J. | * |
dc.contributor.author | STANTON, CATHERINE | * |
dc.contributor.author | Dewhurst, Richard J. | * |
dc.contributor.author | Lonergan, P. | * |
dc.contributor.author | Evans, A.C.O. | * |
dc.contributor.author | Butler, Stephen | * |
dc.date.accessioned | 2012-12-18T13:19:22Z | |
dc.date.available | 2012-12-18T13:19:22Z | |
dc.date.issued | 2011-07 | |
dc.identifier.citation | Ian Hutchinson, Michael J de Veth, Catherine Stanton, Richard J Dewhurst, Pat Lonergan, Alex C O Evans and Stephen T Butler (2011). Effects of lipid-encapsulated conjugated linoleic acid supplementation on milk production, bioenergetic status and indicators of reproductive performance in lactating dairy cows. Journal of Dairy Research, 78, pp 308-317. doi:10.1017/S0022029911000422. Copyright © Proprietors of Journal of Dairy Research | en_GB |
dc.identifier.issn | 1469-7629 | |
dc.identifier.uri | http://hdl.handle.net/11019/307 | |
dc.description | Peer-reviewed | en_GB |
dc.description.abstract | Conjugated linoleic acid (CLA) reduces mammary milk fat synthesis in a dose-dependent manner. Our objective was to determine the effects of lipid-encapsulated CLA (LE-CLA) supplementation on milk production, reproductive performance and metabolic responses in lactating dairy cows fed a grass silage-based diet. Seventy-two Holstein-Friesian cows (32 primiparous and 40 multiparous) were used in a completely randomized block design. Cows received either 80 g of LE-CLA daily or 60 g of calcium salts of palm fatty acids daily (control) from parturition until 60 days in milk. LE-CLA contained a 50:50 mix of cis-9,trans-11 CLA and trans-10,cis-12 CLA, resulting in a daily intake of 6 g of each isomer. Milk production and dry matter intake were recorded daily, and blood samples were collected 3-times a week. Blood samples were analysed for circulating concentrations of glucose, non-esterified fatty acids (NEFA), β-hydroxybutyrate (BHBA), insulin and insulin-like growth factor-I (IGF-I). Progesterone was measured in blood samples collected after the first post-partum insemination. Ovarian ultrasound examinations commenced at 8–10 d post partum and were carried out 3-times a week until first ovulation. LE-CLA treatment resulted in decreased milk fat concentration, with consequent improvements in energy balance and body condition score (BCS). The peak concentration of NEFA in blood was reduced by LE-CLA, but circulating concentrations of insulin, glucose, IGF-I, BHBA and progesterone were not affected. There was no effect of LE-CLA supplementation on the post-partum interval to first ovulation. Services per conception tended to be reduced. The reduction in milk energy output and improvement in energy status and BCS in LE-CLA-supplemented cows provides a strong rationale for further studies with greater cow numbers to test effects on reproductive performance. | en_GB |
dc.language.iso | en | en_GB |
dc.publisher | Cambridge University Press: Published for the Institute of Food Research and the Hannah Research Institute | en_GB |
dc.relation.ispartofseries | Journal of Dairy Research;vol 78 | |
dc.subject | Conjugated linoleic acid | en_GB |
dc.subject | Reproduction | en_GB |
dc.subject | Milk fat | en_GB |
dc.subject | Energy Balance | en_GB |
dc.title | Effects of lipid-encapsulated conjugated linoleic acid supplementation on milk production, bioenergetic status and indicators of reproductive performance in lactating dairy cows | en_GB |
dc.type | Article | en_GB |
dc.identifier.rmis | 5890 | |
dc.identifier.doi | http://dx.doi.org/10.1017/S0022029911000422 | |
dc.contributor.sponsor | National Development Plan Ireland | |
refterms.dateFOA | 2018-01-12T07:44:48Z |
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Animal & Bioscience [736]
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Animal & Bioscience [736]