Sources of variation in calving difficulty in beef heifers
U. Paputungan, M. Makarechian, M. F. Liu
Asian-Australas J Anim Sci. 1994;7(2):255-260.   Published online 1994 Jun 1     DOI:
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Genetic relationships between calving and carcass traits for Charolais and Hereford cattle in Sweden1
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