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首页> 外文期刊>Tropical Animal Health and Production >Effect of micronutrient supplementation on the immune function of crossbred dairy cows under semi-arid tropical environment.
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Effect of micronutrient supplementation on the immune function of crossbred dairy cows under semi-arid tropical environment.

机译：微量营养素对半干旱热带环境下杂交奶牛免疫功能的影响。

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摘要

This study assessed the effect of micronutrient supplementation around peripartum period on immune function, reproductive performance, milk yield and milk quality of crossbred cows. Thirty pregnant crossbred cows in their late gestation were selected and randomly divided into five groups for study. Six cows in each group were supplemented with vitamin E (VE) (2000 IU/cow/day), vitamin A (VA) (100,000 IU/cow/day), copper (Cu) (20 ppm/cow/day), zinc (Zn) (80 ppm/cow/day) individually from 45 days pre-calving to 45 days post-calving and one group without any supplementation served as control. Immune function was studied by in vitro phagocytic activity (PA) of blood neutrophils, lymphocyte proliferation response (LPR) and plasma interleukin-8 (IL-8) concentration. Supplementation of VA significantly (P<0.05) increased the in vitro PA of blood neutrophils and decreased milk somatic cell counts (SCC). Zn supplementation significantly (P<0.05) increased the T lymphocyte proliferation response, whereas B lymphocyte LPR was significantly (P<0.05) increased with both VA and Zn supplementation as compared to the control cows. Plasma IL-8 concentration was significantly (P<0.05) higher in all supplemented cows. Supplementation of VE, VA and Zn significantly (P<0.05) reduces days open, whereas VA significantly (P<0.05) reduced the service per conception. In this study, it is concluded that VE, VA and Zn supplementation around peripartum period can boost the immunity and improve the reproductive performance of crossbred cows in a semi-arid tropical environment.
机译：这项研究评估了围产期补充微量营养素对杂交母牛的免疫功能，生殖性能，产奶量和奶品质的影响。选择30只妊娠后期妊娠杂交母牛，并随机分为五组进行研究。每组六头母牛补充维生素E（VE）（2000 IU /牛/天），维生素A（VA）（100,000 IU /牛/天），铜（Cu）（20 ppm /牛/天），锌产犊前45天至产犊后45天的（Zn）（80 ppm /牛/天），分别以一组不添加任何营养的组作为对照。通过血液中性粒细胞的体外吞噬活性（PA），淋巴细胞增殖反应（LPR）和血浆白介素8（IL-8）浓度研究了免疫功能。 VA的补充显着（P <0.05）增加了血液中性粒细胞的体外PA，并减少了乳体细胞计数（SCC）。补锌和补锌均显着（P <0.05）增强了T淋巴细胞的增殖反应，而补钙和补锌相比，B淋巴细胞的LPR显着提高（P <0.05）。所有补充奶牛的血浆IL-8浓度均显着较高（P <0.05）。 VE，VA和Zn的补充显着（P <0.05）减少了开放天数，而VA显着（P <0.05）减少了每个受孕的服务时间。在这项研究中，可以得出结论，围产期前后补充VE，VA和Zn可以提高杂交母牛在半干旱热带环境中的免疫力并提高其繁殖性能。

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