Basing on cross design, the production function of Holstein milk production was founded as follows: y=3.614+2.097*Z-1+0.7574*Z-2 -0.03024* Z-1*Z-2+0.044*Z+2-1-0.000574*Z+2-2, by which the economic benefits of Holstein farm could be estimated.
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- 本研究应用正交设计 ;建立了西宁地区荷斯坦牛产奶量的生产函数 :y?=3.;61 4+2