An Observational Analysis of Twin Births, Calf Sex Ratio, and Calf Mortality in Holstein Dairy Cattle
Del Río, N. Silva ; Stewart, S. ; Rapnicki, P. ; Chang, Y.M. ; Fricke, P.M.
Journal of dairy science, 2007-03, Vol.90 (3), p.1255-1264 [Periódico revisado por pares]Savoy, IL: Elsevier Inc
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