Genetic Analysis of Postweaning Performance of Hereford Bulls2

Mavrogenis, A. P.; Dillard, E. U.; Robison, O. W.

doi:10.2527/jas1978.4751004x

Cited by 12 publications

(11 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is evidence to suggest their influence on post-weaning growth traits (Mavrogenis, Dillard and Robison, 1978;Meyer, 1992). There is evidence to suggest their influence on post-weaning growth traits (Mavrogenis, Dillard and Robison, 1978;Meyer, 1992).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Estimation of direct additive and maternal additive genetic effects for weaning weight in Mashona cattle of Zimbabwe using an individual animal model

et al. 1995

View full text Add to dashboard Cite

Weaning weights (or weight nearest to 205 days of age) from 8086 Mashona calves were collected from seven herds covering the period 1976 to 1988. Estimates of (co)variance components were obtained by restricted maximum likelihood using a derivative free algorithm and fitting an individual animal model. Estimates of direct additive heritability, maternal additive heritability, their correlation, total heritability and repeatability, obtained under two models were 0·243 and 0·281, 0·113 and 0·392, –0·282 and –0·269, 0·252 and 0·298, and 0·409 and 0·573, respectively. Trends within herd were estimated from the mean value of progeny born within a particular year. There were no significant trends in direct additive breeding values. A general decline in maternal breeding values was observed. Only one herd (herd 1) had a significant eroiyonmeYital freni (0·385 kg/year). It IMS emphftsilfiti that any future revision of the method used to improve the weaning weights of beef cattle should also improve their maternal breeding values.

show abstract

Section: Discussionmentioning

confidence: 99%

“…There is evidence to suggest their influence on post-weaning growth traits (Mavrogenis, Dillard and Robison, 1978;Meyer, 1992). Mazabuka 1965-1977and at Mochipapa Regional Research Station, Choma, 1972-1978 Such practices lengthen the generation interval thereby reducing the rates of response.…”

Section: Discussionmentioning

confidence: 99%

Estimation of direct additive and maternal additive genetic effects for weaning weight in Mashona cattle of Zimbabwe using an individual animal model

et al. 1995

View full text Add to dashboard Cite

show abstract

“…Atchley & Rutledge (1980) also found no significant age-related increase in sex-corrected heritability for trunk circumference while tail length's heritability was significantly positively correlated with age. Agricultural genetic studies of weight in cattle (Mavrogenis, Dillard & Robison, 1978;Trail, Sacker & Fisher, 1971), sheep (Dzakuma, Nielsen & Doane, 1978;Mavrogenis etal. 1980;Martin e<a£.…”

Section: Introductionmentioning

confidence: 99%

Quantitative genetics and the evolution of ontogeny: I. Ontogenetic changes in quantitative genetic variance components in randombred mice

et al. 1983

View full text Add to dashboard Cite

We report the results of an ontogenetic analysis of quantitative genetic variance components with two replicates drawn from the randombred ICR strain of mice. A total of 432 mice from 108 full-sib families raised in a cross-fostering design were used to estimate direct effects heritability, maternal effects, and environmental effects for weight, head length, trunk length, trunk circumference, and tail length at 17, 24, 31, 38, 45, 52, 59, and 66 days of age. There was no significant difference in heritability between the replicates. Heritabilities either stayed more or less constant with age at about 030 (weight, trunk length, trunk circumference) or increased slightly with age (head length, tail length). Maternal effects decreased with age from a maximum of about 050 at weaning to about 015 at age 66 when growth was nearly complete. Environmental effects increased in relative importance during ontogeny.

show abstract

“…Dickerson (1947), Cockerham (1954), and Koch and Clark (1955) covariances of maternal, dominance, and environmental effects (e.g., Bondari, 1971;Burfening et al, 1981;Hohenboken and Brinks, 1971a;Mavrogenis et al, 1978;Martinez et al, 1983).…”

Section: Methodsmentioning

confidence: 99%

“…Koch and Clark (]955) determined that maternal effects play an important role in the expression of growth of an offspring until they are weaned. However, Mavrogenis et al (1978) and Rutledge et al (1972) determined that these maternal effects even play an important role into the postweaning period of life. Extensive reviews present evidence of maternal effects in small rodents (Legates, 1972), sheep (Bradford, 1972), swine (Robison, 1972), and beef cattle (Koch, 1972).…”

Section: Review Of Literaturementioning

confidence: 99%

Direct genetic and maternal variance and covariance component estimates from Angus and Hereford field data

Skaar

View full text Add to dashboard Cite

INFORMATION TO USERSThis reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted.The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity.2. When an image on the film is obliterated with a round black mark, it is an indication of either blurred copy because of movement during exposure, duplicate copy, or copyrighted materials that should not have been filmed. For blurred pages, a good image of the page can be found in the adjacent frame. If copyrighted materials were deleted, a target note will appear listing the pages in the adjacent frame.3. When a map, drawing or chart, etc., is part of the material being photographed, a definite method of "sectioning" the material has been followed. It is customary to begin filming at the upper left hand comer of a large sheet and to continue from left to right in equal sections with small overlaps. If necessary, sectioning is continued again-beginning below the first row and continuing on Uiitil cOjiipleîc.

show abstract

Genetic Analysis of Postweaning Performance of Hereford Bulls2

Cited by 12 publications

References 25 publications

Estimation of direct additive and maternal additive genetic effects for weaning weight in Mashona cattle of Zimbabwe using an individual animal model

Estimation of direct additive and maternal additive genetic effects for weaning weight in Mashona cattle of Zimbabwe using an individual animal model

Quantitative genetics and the evolution of ontogeny: I. Ontogenetic changes in quantitative genetic variance components in randombred mice

Direct genetic and maternal variance and covariance component estimates from Angus and Hereford field data

Contact Info

Product

Resources

About