黄上真;蒋振兴;邱奥;解湉;卢迪;李金晓;常瑶;郭彦斌;马亚宾;王雅春;

• 1:中国农业大学动物科学技术学院
• 2:北京首农畜牧发展有限公司
• 3:河北省畜牧良种工作站

摘要(Abstract)：

为探究荷斯坦牛围产后期乳成分变化规律及其影响因素,本研究采集了79头新产母牛产后0～7 d每次挤奶的牛奶样品,测定1 573份样品的乳脂率、乳蛋白率、乳糖率、牛奶尿素氮含量和乳干物质率,比较初乳和常乳在各项乳成分上的差异,并分析乳成分在母牛产后随时间的变化趋势,利用SAS 9.2软件分析胎次和挤奶时间对乳成分的影响。结果表明:与新产牛产后第1次分泌的牛奶相比,产后第2次分泌的牛奶中的乳成分已发生改变;乳脂率、乳蛋白率和乳干物质率在产后逐渐下降(P<0.05),而乳糖率和牛奶尿素氮含量在产后逐渐上升(P<0.05);除乳脂率外,其他乳成分在产后第7天尚未达到常乳水平(P<0.05);胎次对初乳的乳脂率和乳蛋白率均有显著影响,挤奶间隔时长造成早中晚所产牛奶在乳脂率、乳蛋白率和牛奶尿素氮含量上存在显著差异。因此,选择初乳及过渡乳饲喂犊牛时,应充分考虑产后时间、胎次和挤奶间隔等因素对营养成分造成的影响。

关键词(KeyWords)： 新产牛;乳成分;牛奶尿素氮;胎次;挤奶间隔

Abstract:

Keywords:

基金项目(Foundation): 现代农业(奶牛)产业技术体系建设专项资金(CARS-36);; 长江学者和创新团队发展计划(IRT_15R62);; 现代农业产业技术体系北京市奶牛创新团队(BAIC06-2019);; 河北省现代农业产业技术体系奶牛产业创新团队(HBCT201812020)

作者(Authors): 黄上真;蒋振兴;邱奥;解湉;卢迪;李金晓;常瑶;郭彦斌;马亚宾;王雅春;

DOI: 10.19556/j.0258-7033.20190623-01

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