Genetic parameters and relationships of heifer pregnancy and age at first calving with weight gain, yearling and mature weight in Nelore cattle
نویسندگان
چکیده
منابع مشابه
Genetic associations between age at first calving and heifer body weight and scrotal circumference in Nelore cattle.
Summary Age at first calving (AFC) measures the entry of heifers into the beef cattle production system. This trait can be used as a selection criterion for earlier reproductive performance. Using data from Nelore cattle participating in the 'Program for Genetic Improvement of the Nelore Breed' (PMGRN-Nelore Brazil), bi-trait analyses were performed using the restricted maximum likelihood metho...
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the aim followed in the present study was to investigate the economic aspects of , and to derive economic weights (ews) for mature body weight (mbw) as well as for age at first calving (afc) in holstein dairy cattle of iran. economic values (evs) for traits were estimated using trait-by-trait bio-economic models. absolute evs were rls -16400 and -17900 per cow per year for mbw and afc, respecti...
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Cattle behavior, including measures of docility, is important to beef cattle producers not only from a human safety perspective but also due to potential correlations to economically relevant traits. Field data from the American Hereford Association was used to estimate genetic parameters for chute score (CS; = 25,037), weaning weight (WW; = 24,908), yearling weight (YW; = 23,978), and intramus...
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ژورنال
عنوان ژورنال: Livestock Science
سال: 2011
ISSN: 1871-1413
DOI: 10.1016/j.livsci.2011.04.009