摘要： 为研究共轭亚油酸钙对奶牛乳脂肪的影响,选取16头泌乳中期的奶牛饲喂不同日粮,分为对照组(基础日粮)、共轭亚油酸钙低剂量组(基础日粮+50 g/(头.d))、中剂量组(基础日粮+100 g/(头.d))、高剂量组(基础日粮+200 g/(头.d)),试验共进行14 d,分析乳产量和乳成分。结果表明,日粮中添加共轭亚油酸钙对奶牛的乳产量、乳蛋白和乳糖没有影响,但极显著降低了乳脂肪含量(P<0.01)。检测脂肪酸组成发现奶牛的中、短链脂肪酸(C6、C10、C12、C16)含量显著降低(P<0.05),而长链脂肪酸(C18、C18:1)的含量显著增加(P<0.05);发现添加共轭亚油酸钙显著降低了各种脂肪酸的产量。研究结果显示,奶牛饲料中添加共轭亚油酸钙能够降低乳脂率,改变脂肪酸的组成。
关键词:
奶牛,
共轭亚油酸,
乳成分,
脂肪酸
Abstract: To investigate the effect of Ca-CLA on the milk yield and quality， sixteen lactating cows were selected and allocated randomly into 4 treatments，basal diet plus 0 g /d( control), 50 g /d( Low group),1 00 g /d( medium group) and 200 g /d( high group) Ca-CLA for two weeks， then the milk yield and composition was analyzed． The results showed that the milk yield，protein content and lactose content had no difference among the 4 treatments，while the milk fat content was significantly reduced in Ca-CLA supplement groups( P ＜ 0． 01),compared with the control． The gas-liquid chromatography analysis of FAME revealed that the fatty acid composition of milk was markedly altered by Ca-CLA treatments． Adding Ca-CLA in the diet of lactating cows decreased significantly the composition of short and midium chain fatty acids( C6，C10，C12 and C16),but increased significantly the concentration of stearic ( C18: 0) and linoleic( C18: 2) acids in milk fat( P ＜ 0． 05). The yield of total milk fatty acid reduced significantly in the Ca-CLA supplement treatments． This suggested that the supplement of Ca-CLA in dietary resulted in the reduction of milk fat rate and the alternation of milk fatty acid composition．
Key words:
Mik Cow,
Conjugated linoleic acid,
Milk composition,
Fatty acid
中图分类号:
庞坤, 王亚宾, 王会峰, 郭爽, 韩立强. 共轭亚油酸钙对奶牛产奶量和品质的影响[J]. 华北农学报, 2012, 27(6): 167-171. doi: 10.3969/j.issn.1000-7091.2012.06.033.
PANG Kun, WANG Ya-bin, WANG Hui-feng, GUO Shuang, HAN Li-qiang. Effect of Adding Ca-CLA on Milk Yield and Quality of Lactating Cows[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(6): 167-171. doi: 10.3969/j.issn.1000-7091.2012.06.033.