Effect of Adding Ca-CLA on Milk Yield and Quality of Lactating Cows

doi:10.3969/j.issn.1000-7091.2012.06.033

Abstract

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

CLC Number:

S823.91

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.

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