Effects of breed type and age at first calving on length of productive life in a cow-calf system in Southeastern Mexico.
作者： Ildefonso Aranda-Avila , Juan G. Magaña-Monforte , Jose C. Segura-Correa
DOI: 10.1007/S11250-010-9629-8
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摘要: The effect of age at first calving (AFC) and breed type (BG) on cow length productive life in the herd (LPL) cumulative kilograms calves weaned per (KWC) was studied. Data 313 Brahman, 183 Nellore, 269 crossbred cows (undefined crosses European × Zebu cattle) born from 1986 to 2002 were used. Three hundred ninety-one out 765 had non-censored data. LPL curves by BG AFC ( 0.05), but there for hazard ratio culling (p < 0.05). Brahman Nellore produced more 0.05) than cows. influenced = 0.014) KWC 0.012). Cows with <3 years stayed longer those a higher
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