Economical and biological efficiencies of beef cattle differing in level of milk production.
作者： M Van Oijen , M Montano-Bermudez , Merlyn K Nielsen
DOI: 10.2527/1993.71144X
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摘要: Economical and biological efficiencies of beef production to weaning slaughter were estimated in three groups, different milk available (low, medium, high) the calves but with same potential for growth. Data from breed groups cows (low (Ll = Hereford x Angus, medium (MI Red Poll high (HI Milking Shorthorn Angus) used. efficiency was ratio income expenses calf weight total feed energy required. Income derived cull at or carcasses fed slaughter. Feed non-feed cowherd included economical efficiency. Efficiencies assuming observed reproductive rates requirements maintenance, as well equal require- ments maintenance M H groups. With requirements,
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