Genetic relationships between scrotal circumference and female reproductive traits1
نویسندگان
چکیده
منابع مشابه
Genetic relationships between scrotal circumference and female reproductive traits.
Records for yearling scrotal circumference (SC; n = 7,580), age at puberty in heifers (AP; n = 5,292), age at first calving (AFC; n = 4,835), and pregnancy, calving, or weaning status following the first breeding season (PR1, CR1, or WR1, respectively; n = 7,003) from 12 Bos taurus breeds collected at the Meat Animal Research Center (USDA) between 1978 and 1991 were used to estimate genetic par...
متن کاملRelationships of Scrotal Circumference to Puberty and Subsequent Reproductive Performance in Male and Female Offspring
Reproductive efficiency, obtained through cost-effective measures, is the most important factor affecting profitability of the cow-calf enterprise. The reproductive efficiency of bulls and females both contribute to expressed reproductive performance of the cow herd. It is quite possible that although females are culled for low expressed reproduction, sires with only average reproductive potent...
متن کاملAdditive genetic relationships between scrotal circumference, heifer pregnancy, and stayability in Nellore cattle.
Scrotal circumference data from 47,605 Nellore young bulls, measured at around 18 mo of age (SC18), were analyzed simultaneously with 27,924 heifer pregnancy (HP) and 80,831 stayability (STAY) records to estimate their additive genetic relationships. Additionally, the possibility that economically relevant traits measured directly in females could replace SC18 as a selection criterion was verif...
متن کاملRelationships of sire scrotal circumference to offspring reproduction and growth.
Reproductive and growth data were obtained on 779 and 564 yearling beef heifers and bulls, respectively, that had sires with yearling scrotal circumference data at the San Juan Basin Research Center, Hesperus, CO. Partial regression coefficients of reproductive and growth traits on inbreeding (FXC) and age of the individual and adjusted scrotal circumference of sire (SCSI) were obtained. Growth...
متن کاملGenetic parameters and relationships between growth traits and scrotal circumference measured at different ages in Nellore cattle
Records from 106,212 Nellore animals, born between 1998 and 2006, were used to estimate (co)variance components and genetic parameters for birth weight (BW), average weight gains from birth to weaning (GBW), average weight gains from weaning to after yearling (GWAY), weaning hip height (WHH), postweaning hip height (PHH) and scrotal circumferences at 9 (SC9), 12 (SC12) and 15 (SC15) months of a...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 2003
ISSN: 0021-8812,1525-3163
DOI: 10.2527/2003.812395x