Beef cattle

Genetics of efficient feed utilization and national cattle evaluation: a review

D. H. Denny Crews, Jr., Genetics of efficient feed utilization and national cattle evaluation: a review, vol. 4. pp. 152-165, 2005.

Selection for the wide range of traits for which most beef breed associations calculate expected progeny differences focus on increasing the outputs of the production system, thereby increasing the genetic potential of cattle for reproductive rates, weights, growth rates, and end-product yield. Feed costs, however, represent a large proportion of the variable cost of beef production and genetic improvement programs for reducing input costs should include traits related to feed utilization.

Age-of-dam adjustment factors for birth and weaning weight records of beef cattle: a review

J. M. Rumph and L. Van Vleck, D., Age-of-dam adjustment factors for birth and weaning weight records of beef cattle: a review, vol. 3. pp. 1-17, 2004.

Age-of-dam adjustment factors are used to preadjust birth and weaning weight data for national beef cattle genetic evaluations. Adjustments are used in order to make the means of the different age-of-dam subclasses similar so that a fair comparison of animals can be performed. A review was made of various research studies that have estimated age-of-dam adjustment factors for birth weight and weaning weight of beef cattle.

(Co)variance components, genetic parameters and annual trends for calf weights in a Brahman herd kept on floodable savanna

D. Plasse, Verde, O., Arango, J., Camaripano, L., Fossi, H., Romero, R., M., C. Rodriguez, and Rumbos, J. L., (Co)variance components, genetic parameters and annual trends for calf weights in a Brahman herd kept on floodable savanna, vol. 1, pp. 282-297, 2002.

(Co)variance components and genetic parameters were estimated for body weights of an elite Brahman herd under a designed, supervised management and genetic program, including strategic artificial insemination (AI). Restricted maximum likelihood methods were used with a univariate animal model for birth weight (BW) and a bivariate model for weaning weight (205-day weight, 205W) and 18-month weight (548-day weight, 548W).

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