Effect of saturated fatty acid supplementation on production and metabolism indices in heat-stressed mid-lactation dairy cows

文献类型： 外文期刊

第一作者： Wang, J. P.

作者： Wang, J. P.;Bu, D. P.;Wang, J. Q.;Huo, X. K.;Guo, T. J.;Wei, H. Y.;Zhou, L. Y.;Wang, J. P.;Rastani, R. R.;Baumgard, L. H.;Li, F. D.

作者机构：

关键词： saturated fatty acid;heat stress;milk yield;metabolism

期刊名称：JOURNAL OF DAIRY SCIENCE （ 影响因子：4.034； 五年影响因子：4.354 ）

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收录情况： SCI

摘要： Experimental objectives were to determine the effects of supplemental saturated fatty acids on production, body temperature indices, and some aspects of metabolism in mid-lactation dairy cows experiencing heat stress. Forty-eight heat-stressed Holstein cows were allocated into 3 groups (n = 16/group) according to a completely randomized block design. Three treatment diets consisted of supplemental saturated fatty acids (SFA) at 0 (SFA0), 1.5 (SFA1.5), or 3.0% (SFA3) of dry matter (DM) for 10 wk. Diets were isonitrogenous (crude protein = 16.8%) and contained 1.42, 1.46, and 1.49 Mcal of net energy for lactation/kg of DM for the SFA0, SFA1.5 and SFA3 diets, respectively. The average temperature-humidity index at 0700, 1400 and 2200 h was 72.2, 84.3, and 76.6, respectively. Rectal temperatures at 1400 h were decreased with fat supplementation. Treatment did not affect dry matter intake (20.1 +/- 0.02 kg/d), body condition score (2.72 +/- 0.04), body weight (627 +/- 16.1 kg), or calculated energy balance (1.32 +/- 0.83 Mcal/d). Saturated fatty acid supplementation increased milk yield, milk fat content, and total milk solids. Increasing fat supplementation decreased plasma nonesterified fatty acids (8%) but had no effect on other energetic metabolites or hormones. In summary, supplemental SFA improved milk yield and milk fat content and yield and reduced peak rectal temperatures in mid-lactation heat-stressed dairy cows. This demonstrates the remarkable amount of metabolic heat that is "saved" by energetically replacing fermentable carbohydrates with supplemental SFA.

分类号： TS252

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