不同养殖规模下奶牛产奶量､氮素平衡与利用效率研究
马骁远1, 高志岭1, 高艳霞2, 谷秋莳1, 李建国2, 马文奇1
Milk production,nitrogen balance and utilization efficiency of lactating cows in dairy operations with different sizes
MA Xiao-yuan1,GAO Zhi-ling1,GAO Yan-xia2,GU Qiu-shi 1,LI Jian-guo2,MA Wen-qi1
河北农业大学学报
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2014, (3): 88
-93
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DOI: 10.13320/j.cnki.jauh.2014.0070
