Birth Weight Weaning Weight Yearling Weight Scrotal Circum
نویسنده
چکیده
Understanding and using EPDs continues to be a popular topic among cattle producers because of their effectiveness when properly used in genetic selection. Use of EPDs, as with many other standard management tools, is not required to survive in the beef cattle business, but those who do will excel in terms of genetic improvement. With so many traits to monitor in a cow herd, producers should not limit themselves to selecting a herd bull based primarily on his own individual weight traits. More than one producer has found out bigger is not always better.
منابع مشابه
Estimation of variance components and prediction of breeding values for scrotal circumference and weaning weight in Limousin cattle.
Variance and covariance components were estimated for yearling scrotal circumference and weaning weight from Limousin field data. Records of 8.226 bulls were used to evaluate 584 sires and 653 maternal grandsires. Data included all herdbook records of bulls with a recorded scrotal circumference and their weaning contemporaries. Analyses were performed by restricted maximum likelihood techniques...
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Data associated with 1,531 Herefords shown at the National Western Stock Show at Denver from 1978 to 1984 were used to estimate heritability and repeatability of show-ring placing (SRP) and genetic, environmental and phenotypic correlations. The correlations were those between: SRP and individual measurements (IM) taken at the time of show and available to the judges, SRP and parents' SRP and I...
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Simultaneous selection for low birth weight and high yearling weight has been advocated to improve efficiency of beef production. Two sublines of Line 1 Hereford cattle were established by selection either for below-average birth weight and high yearling weight (YB) or for high yearling weight alone (YW). Direct effects on birth weight and yearling weight diverged between sublines with approxim...
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Selection was applied from 1964 to 1978 for increased weaning weight (WWL) or yearling weight (YWL) in two Hereford lines. An Angus line was maintained as an unselected control line (CL). Each line was maintained with 50 cows and four sires each year (two sires selected each year and used for 2 yr). Primary traits measured in the lines were birth weight (BW), preweaning daily gain (WDG), weanin...
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