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11 July 2016 Effects of acetate and long-chain fatty acids infusion into external pudic artery on lactation performance and milk fatty acid composition in lactating dairy cows
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Abstract

Our objective was to observe the effects of milk fat substrates (MFS) [acetate combined with long-chain fatty acid (FA)] supplementation on lactation performance and milk FA composition of cows fed an energy- and nutrient-deficient diet. Eight Holstein cows (99 ± 11 d) were averagely assigned to two diets based on either corn stover (CS) or mixed forages (MFs). Experiment included two stages and each lasted for 27 d with a 21 d preliminary and a 6 d infusion. Cows with CS diet [NEL = 1.35 Mcal kg-1 of dry matter (DM)] received carrier at the first 3 d and MFS at the following 3 d of infusion period. Cows with MF diet (NEL = 1.66 Mcal kg-1 of DM) received carrier during the 6 d infusion period. The differences in milk production, milk yields of fat, and protein between the two diet groups were compensated by MFS infusion (from -3.5 to -1.3, -0.19 to -0.08, and -0.13 to -0.07 kg d-1, respectively). Infusion of MFS increased the concentrations of 18:2 and 18:3 in milk fat. The results suggested that supplement of MFS could influence milk fat synthesis and lactation performance in cows fed an energy- and nutrient-deficient diet.

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Chen Bai, XianXian Huo, Khas- Erdene, ChangJin Ao, ShuaiWang Liu, XianJue Wang, FuQuan Zhang, and Peng Gao "Effects of acetate and long-chain fatty acids infusion into external pudic artery on lactation performance and milk fatty acid composition in lactating dairy cows," Canadian Journal of Animal Science 97(1), 127-135, (11 July 2016). https://doi.org/10.1139/cjas-2015-0160
Received: 26 October 2015; Accepted: 1 June 2016; Published: 11 July 2016
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