中国荷斯坦牛乳中尿素氮变化规律的研究
发布时间：2018-09-08 13:37
【摘要】：为探索荷斯坦牛乳中尿素氮(Milk Urea Nitrogen,MUN)含量变化规律,利用最小二乘法对江苏某大型奶牛场5008头中国荷斯坦奶牛2010年1月到2013年12月98 882条DHI测定日记录中的MUN含量进行了分析。研究表明:该牛场MUN含量为(12.30±0.01)mg/dL,不同年度、测试季节、产犊季节、泌乳月和胎次对MUN含量的影响均达到极显著水平(P0.01)。其中2013年MUN含量显著高于其余三年;夏季测定的MUN含量较高,冬季较低;冬季产犊的奶牛乳中MUN含量显著高于其余三个季节,夏秋两季产犊的MUN含量最低;第7、8泌乳月的MUN含量最高,第1个泌乳月的MUN含量最低,且差异显著;各胎次间MUN含量差异显著,其中第三胎的MUN含量最高,第一胎最低。该结果可指导牧场重点关注夏冬两季、泌乳前期及冬季产犊奶牛乳中的MUN含量。此外,各胎次间乳中的MUN含量也应区别对待,并根据变化趋势合理调整奶牛日粮配方,以期提高牧场管理水平和经济效益。
[Abstract]:In order to explore the change rule of urea nitrogen (Milk Urea Nitrogen,MUN) content in Holstein milk, the MUN content in 98 882 daily records of 5008 Chinese Holstein cows from January 2010 to December 2013 in a large dairy in Jiangsu Province was analyzed by least square method. The results showed that the MUN content in the cattle farm was (12.30 卤0.01) mg/dL, in different years. The effect of test season, calving season, milking month and birth number on MUN content was significant (P0.01). The MUN content in 2013 was significantly higher than that in the other three years, the content of MUN in summer was higher than that in winter, the content of MUN in milk of calving in winter was significantly higher than that in the other three seasons, and the content of MUN in calving in summer and autumn was the lowest. The content of MUN was the highest in the 7th month of lactation, and the lowest in the first month of lactation, and the difference was significant, and the content of MUN in the third fetus was the highest, and that in the first baby was the lowest. The results can guide the pasture to focus on the MUN content in the milk of dairy cows in summer and winter, in the early stage of lactation and in the calving in winter. In addition, the content of MUN in milk should be treated differently, and the formula of dairy cattle diet should be adjusted according to the changing trend, in order to improve the level of pasture management and economic benefit.
【作者单位】： 扬州大学动物科学与技术学院;扬州市江都区畜牧兽医站;
【基金】：江苏省苏北专项(BN2016027) 江苏省研究生创新计划资助项目(SJZZ15_0182) 江苏省优势学科项目(PAPD) 江苏省农业三新工程项目(SXGC[2015]328)
【分类号】：S823
本文编号：2230672
[Abstract]:In order to explore the change rule of urea nitrogen (Milk Urea Nitrogen,MUN) content in Holstein milk, the MUN content in 98 882 daily records of 5008 Chinese Holstein cows from January 2010 to December 2013 in a large dairy in Jiangsu Province was analyzed by least square method. The results showed that the MUN content in the cattle farm was (12.30 卤0.01) mg/dL, in different years. The effect of test season, calving season, milking month and birth number on MUN content was significant (P0.01). The MUN content in 2013 was significantly higher than that in the other three years, the content of MUN in summer was higher than that in winter, the content of MUN in milk of calving in winter was significantly higher than that in the other three seasons, and the content of MUN in calving in summer and autumn was the lowest. The content of MUN was the highest in the 7th month of lactation, and the lowest in the first month of lactation, and the difference was significant, and the content of MUN in the third fetus was the highest, and that in the first baby was the lowest. The results can guide the pasture to focus on the MUN content in the milk of dairy cows in summer and winter, in the early stage of lactation and in the calving in winter. In addition, the content of MUN in milk should be treated differently, and the formula of dairy cattle diet should be adjusted according to the changing trend, in order to improve the level of pasture management and economic benefit.
【作者单位】： 扬州大学动物科学与技术学院;扬州市江都区畜牧兽医站;
【基金】：江苏省苏北专项(BN2016027) 江苏省研究生创新计划资助项目(SJZZ15_0182) 江苏省优势学科项目(PAPD) 江苏省农业三新工程项目(SXGC[2015]328)
【分类号】：S823
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