ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2013, Vol. 44 ›› Issue (12): 1954-1960.doi: 10.11843/j.issn.0366-6964.2013.12.014

Previous Articles     Next Articles

Comparison of Amino Acids Content in Plasma of Caudal Artery and External Pudic Artery of Lactating Dairy Cows

LIU Na1, KHAS-ERDENE1, ZHANG Xing-fu1, SONG Li-wen1, AO Chang-jin1*, GAO Min2*   

  1. (1.College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, China; 2.Institute of Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010030, China)
  • Received:2013-03-04 Online:2013-12-23 Published:2013-12-23

Abstract:

This aim of the experiment was to investigate whether the external pudic artery blood could be replaced by the caudal artery blood in studies, such as research on amino acids uptake efficiency in mammary gland, through the comparison of the content of amino acids between caudal artery plasma and external pudic artery plasma under three different diets in lactating dairy cows. Thirty Holstein dairy cows in middle lactation ((120±24)d) were randomly assigned to three groups, ten cows each group with similar body weight ((554±21)kg) and milk yield ((24.30±1.47) kg·d-1). The complete random design was used in this study. The diets were diet 1 (Alfalfa + Whole Corn Silage + Leymus chinensis mixed roughage diet group), diet 2 (proximate nutrients approximately equal to diet 1 straw diet group) and diet 3 (straw substituted the roughage in diet 1 totally). The experiment lasted 28 days, the external pudic artery blood samples and the caudal artery blood samples were collected, and the contents of free amino acids in the external pudic artery blood and the caudal artery blood were tested among the last two days. The result showed no significant difference (P>0.05) in content of the most of the single amino acids between the external pudic artery plasma and the caudal artery plasma under three diets, there was significant difference only in content of Thr (P=0.023 4). It was suggested that the caudal artery blood could substitute the external pudic artery blood in study on amino acids uptake efficiency in mammary gland under certain circumstances.

CLC Number: