摘要
选择产后150～210 d的中国荷斯坦奶牛48头,根据产奶量、分娩时间和胎次分为对照组(SFA0)、1.5%(SFA1.5)和3.0%(SFA3)饱和脂肪酸试验组,来研究饱和脂肪酸对高温环境条件下泌乳中期奶牛血液CO2、离子浓度和离子平衡的影响,旨在为合理利用饱和脂肪酸及其缓解奶牛热应激提供理论依据。结果表明,日粮添加饱和脂肪酸,奶牛血清中CO2的平均含量对照组、1.5%饱和脂肪酸组和3%饱和脂肪酸组分别为20.92,21.82和21.31 mmol/L,1.5%饱和脂肪酸组显著高于对照组(P<0.05),日粮添加饱和脂肪酸对热应激奶牛血液K、Na、Cl、Ca离子和离子平衡无显著影响,日粮添加饱和脂肪酸显著提高产奶量、乳脂和干物质含量(P<0.05)。说明饱和脂肪酸具有改善热应激奶牛生产性能,缓解热应激奶牛血液CO2下降的作用。
The objective of this study was to investigate the effect of supplemental saturated fatty acids on blood CO2, ions concentration and cation-anion balance of mid-lactating dairy cows under heat stress. Forty eight Chinese Holstein cows （150--210 days） were divided into three groups according to random block design with milk yield, DIM （days in milking） and parity. The animals were fed with diets contained 0, 1.5% and 3.0% saturated fatty acid for group 1（control）, group 2 （SFA1. 5） and group 3 （SFA3.0）, respectively. The minimum THI （temperature-humidity index） was normally more than 72 during experimental period. Blood COz concentration was 20.92, 21.82 and 21.31 mmol/L in cows fed with control, SFA1.5 and SFA3 diet, respectively. The blood COx concentration was higher in SFA1. 5 cows than control （P〈0. 05）. There were no effects of treatment on ions concentration and cation anion. The milk yield, milk fat content and total solid were improved by supplemental saturated fatty acid （P〈0.05）. In summary, supplemental saturated fatty acids improved milk yield and milk components and lessened blood COx concentration decrease in mid lactation heat-stressed dairy cows.
出处
《草业学报》
CSCD
北大核心
2013年第3期314-320,共7页
Acta Prataculturae Sinica
基金
"十一五"国家奶业科技支撑计划(2006BAD04A14)
河南科技大学博士基金(09001474)资助
关键词
饱和脂肪酸
热应激
奶牛
CO2
血液离子浓度
血液阴阳离子平衡
heat stress
dairy cows
saturated fatty acids
carbon dioxide
blood ions concentration
blood cat-ion-anion balance
