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热应激对不同泌乳阶段奶牛瘤胃内环境发酵指标的影响 被引量:3

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摘要 该试验旨在研究热应激对不同泌乳阶段奶牛瘤胃内环境发酵指标,即瘤胃液pH值、氨氮浓度(NH3-N)以及挥发性脂肪酸浓度(VFA)的影响。选用不同泌乳阶段且胎次相近的荷斯坦奶牛18头,按照同一泌乳阶段奶牛泌乳天数和产奶量相近的原则,平均分为3组,泌乳前期组、中期组和后期组,根据实测试验期牛舍温湿指数(THI)的变化,进行热应激与非热应激的对照试验。结果表明:奶牛热应激时,各泌乳阶段奶牛瘤胃液pH值均较非热应激期有所升高(P>0.05),但都在正常范围之内;热应激显著降低了瘤胃液NH3-N和总VFA浓度(P<0.01),而乙酸与丙酸的比例显著提高(P<0.01)。总之,奶牛热应激严重影响了奶牛瘤胃内环境健康,最终可能影响奶牛正常生产性能的发挥。
出处 《畜牧与饲料科学》 2011年第9期68-71,共4页 Animal Husbandry and Feed Science
基金 国家农业公益性行业(农业)科研专项--气候变化对农业生产的影响及应对技术研究(200903003) 国家现代农业产业技术体系建设专项资金(nycytx-02-05)
关键词 热应激 瘤胃 奶牛
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参考文献12

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二级参考文献26

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