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《China Dairy Cattle》 2010-01
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Effect of of Nutritional Factors on Concentrations of Milk Urea Nitrogen

Huang Wenming1,2, Wang Zhisheng2, Wang Tian3, Wang Yu4, Wen Wan4, Shao Huaifeng4, Li Shengli1, Cao Zhijun1 (1. College of Animal Science and Technology, China Agricultural University, Beijing 100193; 2. Institute of Animal Nutrition, Sichuan Agricultural University, Yaan 625014; 3. College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095; 4. Ningxia Animal Husbandry Workstation, Yinchuan 750004)  
The research used 21 trials with 92 treatments and 551 lactating cows to analyze the effect of nutritional factors on concentrations of MUN of Chinese Holstein cows. The results showed that single factors yielded extremely significant regressions on MUN, including dietary crude protein(CP), net energy(NEL),rumen degradable protein(RDP),net energy to protein ratio(N∶P),rumen undegradable protein(RUP)(P 0.01). CP had the strongest relationship with MUN concentrations, followed by NEL, RDP, N∶P, RUP, ADF, RDP∶RUP, DMI and NDF. About the mixed effects models, every combination of dietary factors had extremely significant regressions on MUN(P0.01), the R2 of the combination of CP and RDP:RUP was the highest. The results indicate that dietary CP is the major factor.
【Fund】: 中国农业大学-南京农业大学青年教师开放基金资助(CN2007008);; 公益性行业(农业)科研专项经费资助(nyhyzx07-036)
【CateGory Index】: S823.91
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