动物营养学报2009，Vol.21Issue(3)：301-311,11.DOI:10.3969/j.issn.1006-267x.2009.03.006
饱和脂肪酸对高温环境条件下泌乳中期奶牛产奶性能及牛奶脂肪酸组成的影响
Effects of Supplementation of Saturated Fatty Acid on Milk Production and Milk Fatty Acid Profile of Mid-lactating Cows during Hot Weather
摘要
Abstract
The objective of this study was to investigate the effects of supplemental saturated fatty acid on milk yield, components and fatty acid profile of mid-lactating cows during hot weather. A total of 48 Chinese Holstein cows were divided into three groups according to randomly block design by milk yield, days in milk (DIM,150～210 d)and parity, and were fed isonitroenous diets containing 0 (SFA 0), 1.5% (SFA 1.5) and 3.0% (SFA 3.0) saturated fatty acid, respectively. The minimum temperature humidity index (THI) was normally more than 72 during experimental period. Results showed that the milk yields were higher in SFA 1.5 and SFA 3.0 than those in SFA 0 (P＜0.05), and there was no difference between SFA 1.5 and SFA 3.0. The contents of milk fat and total solid in SFA 3.0 were higher than those in SFA 0 (P＜0.05) , and there were no differences among treatments in milk protein, lactose, milk urea nitrogen and somatic cell score (P＞0.05).The contents of milk fat and total solid were increased linearly (P＜0.05)and milk protein was increased quadratically (P＜0.05) by supplemental fatty acids. There were no differences among treatments in medium-chain, long-chain, long-chain unsaturated (LUFA) , total unsaturated (TUFA) , t10c12 conjugated linoleic acid (CLA) , total saturated fatty acid and the ratio of LUFA to TUFA (P＞0.05). The contents of short-chain fatty acid in SFA 3.0 were lower than those in SFA 0(P＜0.01) and SFA 1.5 (P＜0.05), but there was no difference between SFA 0 and SFA 1. 5. Supplemental saturated fatty acid decreased linearly the contents of medium-chain fatty acid (P = 0. 03) and c9t11CLA (P＜0.01). The contents of c9t11CLA in SFA 0, SFA 1.5 and SFA 3.0 were 0.72, 0.64 and 0.55 g/100 g fat acid methyl esters, respectively. It was concluded that milk yield, milk fat content and total solid were improved by supplemental saturated fatty acid. There was no effect of supplemental saturated fatty acid on milk fatty acid profile except that c9t11CLA was decreased within a normal level.关键词
热应激/奶牛/产奶量/脂肪酸/乳组成Key words
Heat stress/Dairy cows/Milk yield/Fatty acid/Milk component分类
农业科技引用本文复制引用
王建平,王光文,袁耀明,王加启,卜登攀,霍小凯,郭同军,魏宏阳,周凌云,李发弟,梁建光..饱和脂肪酸对高温环境条件下泌乳中期奶牛产奶性能及牛奶脂肪酸组成的影响[J].动物营养学报,2009,21(3):301-311,11.基金项目
"Undeca Fifth"National Dairy Scientific and Technological Support Plan (2006BAD04A14,2006BAD12B08) （2006BAD04A14,2006BAD12B08）
