阴外动脉灌注氨基酸对泌乳奶牛乳中主要脂肪酸组成的影响

doi:10.11843/j.issn.0366-6964.2016.03.015

Abstract

Abstract:

The objective of this study was to investigate the effects of intra-arterial infusion of amino acids on milk performance and milk composition of fatty acids in dairy cows.8 Chinese Holstein cows，fitted with intra-arterial catheters that was terminated in right external pudendal，were used in this study.Cows were fed with TMR based on corn stover basal diet.The experiment lasted for 27 days，including 21-day preliminary period followed by 3-day carrier infusion(CSc) and 3-day amino acids infusion(CSa).Milk was collected twice daily at the last 2 days of each infusion period，and mixed according to the milk production of each cow.The composition of milk fatty acids was determined by GC-FID.The results showed as follows：1) The milk fat percentage of CSa was significantly higher with 5.92% than that of CSc(P＜0.05)，whereas the remaining milk components showed no significant difference between CSa and CSc(P＞0.05)；2) The concentration of C4∶0，C6∶0，C8∶0，C10∶0，C12∶0，C14∶0 and C16∶0 in milk were significantly reduced after amino acids infusion(P＜0.05)，and the concentration of C18∶1cis-9 in milk tended to decrease(P＜0.10)；3) Compared with CSc，AA infusion significantly decreased the total fatty acids concentration by 27.24% in milk(P＜0.05) in CSa group.These results indicate that intra-arterial infusion of amino acids can decrease the content of short- and medium-chain fatty acids in milk，which did not affect long-chain fatty acids content in milk.

CLC Number:

ZHANG Fu-quan，AO Chang-jin，KHAS-Erdene，LIU Shuai-wang，BAI Chen，WANG Xian-jue，GAO Peng，ZHANG Ying. Effects of Intra-arterial Infusion of Amino Acids on Milk Fatty Acids Composition in Lactating Dairy Cows[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2016, 47(3): 529-535.

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Effects of Intra-arterial Infusion of Amino Acids on Milk Fatty Acids Composition in Lactating Dairy Cows

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