Characterization of Biological Types of Cattle IV. Postweaning Growth and Puberty of Heifers

Laster, D. B.; Smith, Gerald M.; Gregory, K. E.

doi:10.2527/jas1976.43163x

Cited by 108 publications

(56 citation statements)

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“…These heritabilities are within the range, from 0.20 to 0.67, of other estimates for age at puberty (Arije and Wiltbank 1971;Smith et al 1976;Laster et al 1979). Reported heritability estimates for scrotal circumference range from 0.39 to 0.75 (Lunstra et al 1988;Martinez-Velazquez et al 2003;Corbet et al 2009).…”

Section: Discussionmentioning

confidence: 48%

Finding genes for economically important traits: Brahman cattle puberty

Fortes

Lehnert

Bolormaa³

et al. 2012

Anim. Prod. Sci.

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Abstract. Age at puberty is an important component of reproductive performance in beef cattle production systems. Brahman cattle are typically late-pubertal relative to Bos taurus cattle and so it is of economic relevance to select for early age at puberty. To assist selection and elucidate the genes underlying puberty, we performed a genome-wide association study (GWAS) using the BovineSNP50 chip (~54 000 polymorphisms) in Brahman bulls (n = 1105) and heifers (n = 843) and where the heifers were previously analysed in a different study. In a new attempt to generate unbiased estimates of singlenucleotide polymorphism (SNP) effects and proportion of variance explained by each SNP, the available data were halved on the basis of year and month of birth into a calibration and validation set. The traits that defined age at puberty were, in heifers, the age at which the first corpus luteum was detected (AGECL, h 2 = 0.56 AE 0.11) and in bulls, the age at a scrotal circumference of 26 cm (AGE26, h 2 = 0.78 AE 0.10). At puberty, heifers were on average older (751 AE 142 days) than bulls (555 AE 101 days), but AGECL and AGE26 were genetically correlated (r = 0.20 AE 0.10). There were 134 SNPs associated with AGECL and 146 SNPs associated with AGE26 (P < 0.0001). From these SNPs, 32 (~22%) were associated (P < 0.0001) with both traits. These top 32 SNPs were all located on Chromosome BTA 14, between 21.95 Mb and 28.4 Mb. These results suggest that the genes located in that region of BTA 14 play a role in pubertal development in Brahman cattle. There are many annotated genes underlying this region of BTA 14 and these are the subject of current research. Further, we identified a region on Chromosome X where markers were associated (P < 1.00E-8) with AGE26, but not with AGECL. Information about specific genes and markers add value to our understanding of puberty and potentially contribute to genomic selection. Therefore, identifying these genes contributing to genetic variation in AGECL and AGE26 can assist with the selection for early onset of puberty.

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Section: Discussionmentioning

confidence: 48%

Finding genes for economically important traits: Brahman cattle puberty

Fortes

Lehnert

Bolormaa³

et al. 2012

Anim. Prod. Sci.

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“…Management of these animals has been reported by Smith et al (1976a,b), Laster et al (1976Laster et al ( , 1979, Gregory et al (1978Gregory et al ( , 1979a, and Cundiff et al (1981Cundiff et al ( , 1984. In brief, calves were born in the spring, castrated within 24 h, and weaned at approximately 200 d of age, except that calves born in 1974 were weaned at 167 d of age because of drought conditions.…”

Section: E553mentioning

confidence: 99%

Correlations for genetic expression for growth of calves of Hereford and Angus dams using a multivariate animal model2

Núñez-Domínguez

Vleck

Boldman

et al. 1993

Journal of Animal Science

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“…Heifers were managed to first calve at 2 yr of age and were fed a diet of approximately 50% corn silage and 50% alfalfa or grass haylage, as well as protein or mineral supplement. See Laster et al (1976Laster et al ( , 1979, Gregory et al (1979a), and Cundiff et al (1993) for details regarding postweaning heifer management. In Cycle I, heifers were bred to Hereford, Angus, Devon, Holstein, and Brahman bulls by artificial insemination.…”

Section: Methodsmentioning

confidence: 99%

Genetic parameters for sex-specific traits in beef cattle.

Splan

Cundiff

Vleck³

1998

Journal of Animal Science

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ABSTRACT:Data from 3,593 beef heifers and 4,079 of their steer paternal half-sibs were used to estimate genetic parameters of and among female growth and reproductive traits and male carcass traits. Estimates of heritability for adjusted 205-d weight, adjusted 365-d weight, age at puberty, calving rate, and calving difficulty measured on females were . 16, .38, .47, .19, and .18, respectively; estimates for calving rate and calving difficulty were expressed on a normal scale. Estimates of heritability for hot carcass weight; retail product percentage; fat percentage; bone percentage; rib eye area; kidney, pelvic, and heart fat percentage; adjusted fat thickness; marbling score; Warner-Bratzler shear force; taste panel tenderness; taste panel juiciness; and taste panel flavor that were measured on steers at an average age of 447 d (weaning age = 185, days on feed = 262) were . 50, .66, .58, .54, .61, .48, .66, .71, .26, .31, .00, and .04, respectively. Genetic correlations were positive for heifer weights with hot carcass weight, fat percentage, rib eye area, adjusted fat thickness, marbling score, and Warner-Bratzler shear force, and they were negative with retail product percentage and kidney, pelvic, and heart fat percentage of steers. Age at puberty was genetically correlated with taste panel tenderness but not with other carcass traits. Calving rate had positive genetic correlations with fat percentage, rib eye area, adjusted fat thickness, and taste panel flavor, and it had negative genetic correlations with retail product percentage; bone percentage; and kidney, pelvic, and heart fat percentage. Calving difficulty had favorable genetic correlations with hot carcass weight, retail product percentage, and measures of carcass tenderness, but it was unfavorably correlated with traits that involve carcass fatness. These results indicate that selection for some traits expressed in one sex of beef cattle may result in undesirable responses in traits expressed in the opposite sex.

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Characterization of Biological Types of Cattle IV. Postweaning Growth and Puberty of Heifers

Cited by 108 publications

References 0 publications

Finding genes for economically important traits: Brahman cattle puberty

Finding genes for economically important traits: Brahman cattle puberty

Correlations for genetic expression for growth of calves of Hereford and Angus dams using a multivariate animal model2

Genetic parameters for sex-specific traits in beef cattle.

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