阴外动脉灌注氨基酸对奶山羊乳腺摄取乳成分前体物的影响

doi:10.3864/j.issn.0578-1752.2011.21.017

Abstract

Abstract: 【Objective】 An experiment was conducted to study the effects of different balance models of amino acids in the artery blood flow by infusing amino acids into the external pudendal artery on nutrient uptake in the mammary gland of dairy goats. 【Method】 Three dairy goats at 2-3-year old of age with similar body weight and milk yield were intubated in the external pudendal artery and the abdominal subcutaneous vein, in this study. Different balance models of amino acids in the blood flow were made by infusing amino acids into the external pudendal artery. Arterio-venous plasma, at the start and the end of infusion, were collected to measure the changes of milk protein precursors (MPP), milk fat precursors (MFP) and milk lactose precursors (MLP) concentrations as well as nutrients uptake in the mammary gland. 【Result】 The uptake of MPP and MFP in the mammary gland was step up after infusing amino acids into the external pudendal artery (P＜0.05). Compared with the control group, the uptake of MLP by the mammary gland was increased after infusing, but there was no significant difference in the ideal amino acids model group (P＞0.05), meanwhile the difference was significant in the balance model group (P＜0.05). The milk production and milk content of the dairy goats were significantly different in the two groups (P＜0.05) compared with the control group. 【Conclusion】 Under the conditions of the experiment, the amino acids balance could change the uptake of milk components precursors in the mammary gland and in favor of the synthesis of milk. The uptake of milk components precursors in the mammary gland was optimum when the amino acid model was arrived at the ideal balance level (AABI=0.972).

Key words:

external pudendal artery, balance model, amino acid, infusion, milk components precursors

WANG Qiang, AO Chang-Jin, GA 尔Di, LU De-Xun, GAO Min, DUAN Bin, FENG Zi-Qi. Influence of Infusing Amino Acids into the External Pudendal Artery on Nutrient Uptake in the Mammary Gland of Dairy Goats[J].Scientia Agricultura Sinica, 2011, 44(21): 4481-4487.

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Influence of Infusing Amino Acids into the External Pudendal Artery on Nutrient Uptake in the Mammary Gland of Dairy Goats

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