中國荷斯坦牛乳中尿素氮變化規(guī)律的研究
[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 鹵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.
【作者單位】: 揚州大學動物科學與技術(shù)學院;揚州市江都區(qū)畜牧獸醫(yī)站;
【基金】:江蘇省蘇北專項(BN2016027) 江蘇省研究生創(chuàng)新計劃資助項目(SJZZ15_0182) 江蘇省優(yōu)勢學科項目(PAPD) 江蘇省農(nóng)業(yè)三新工程項目(SXGC[2015]328)
【分類號】:S823
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