Genetic effects on beef heifer puberty and subsequent reproduction

Martín, Lourdes; Brinks, J. S.; Bourdon, R. M.; Cundiff, L. V.

doi:10.2527/1992.70124006x

Cited by 153 publications

(125 citation statements)

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“…These results were consistent with previously published estimates [11]. The postpartum interval to first positive progesterone test was also a relatively heritable trait (h 2 = 0.32).…”

Section: Discussionsupporting

confidence: 83%

Genetic relationship between cyclic ovarian activity in heifers and cows and beef traits in males

et al. 2001

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-Records were collected in an experimental herd over an 11-year period from purebred Charolais heifers (n = 351), cows (n = 615) and young entire bulls (n = 383). The objective of the study was to estimate the genetic relationship between the components of female ovarian activity (age at puberty and postpartum anoestrus length), their growth rate and body condition score and beef traits measured on related bulls. Two methods were used to estimate age at puberty and postpartum anoestrus length: the detection of oestrous behaviour and a test of cyclicity based on plasmatic progesterone assay. This study shows the existence of significant heritability estimates for the different cyclicity traits (h 2 between 0.11 and 0.38). Most of the genetic correlation coefficients between ovarian activity and growth rate of females and males are negative and favourable (r g between −0.43 and 0.06). Cyclicity is also favourably related with body condition score in young or adult females (r g between −0.65 and −0.22). The genetic relationship between female ovarian activity and proportion of adipose tissue in the male carcass is, however, close to zero. These results show that an antagonism between male beef traits measured in this study and female ovarian activity is unlikely to be a cause for concern in the short term. genetic relationships / ovarian activity / beef-traits / cattle

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“…These results were consistent with previously published estimates [11]. The postpartum interval to first positive progesterone test was also a relatively heritable trait (h 2 = 0.32).…”

Section: Discussionsupporting

confidence: 83%

Genetic relationship between cyclic ovarian activity in heifers and cows and beef traits in males

et al. 2001

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“…Most significant SNPs in terms of P-values are reported in bold. Note that SNP BTA-97369-no-rs was the only SNP not associated with both calibration and validation dataset for neither AGE26 nor AGECL (see Supplementary Material Tables S1, S2 environmental factors, as well as the use of different phenotypic measurements (Martin et al 1992;Cammack et al 2009). …”

Section: Discussionmentioning

confidence: 99%

“…There is a historical and increasing body of evidence reporting the genetic correlations between female and male puberty in cattle (Martin et al 1992). Scrotal circumference of bulls correlates with puberty in their female relatives.…”

Section: Introductionmentioning

confidence: 99%

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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“…For females, the trait most commonly used for measuring sexual precocity is age at first calving (AFC). According to Martin et al (1992), the reproductive performance of heifers depends on the age at which they calve for the first time, with heifers calving earlier having a longer productive life than those calving later. Selection for sexual precocity has been applied directly to AFC and also indirectly, using SC as an indicator trait because SC usually presents a favorable genetic correlation with AFC and shows higher heritability estimates than AFC.…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle

Barrozo

Buzanskas

Oliveira

et al. 2012

Animal

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Animal temperament is a trait of economic relevance and its use as a selection criterion requires the identification of environmental factors that influence this trait, as well as the estimation of its genetic variability and interrelationship with other traits. The objectives of this study were to evaluate the effect of the covariates dam age at calving (ADC), long yearling age (YA) and long yearling weight (YW) on temperament score (T) and to estimate genetic parameters for T, scrotal circumference (SC) at long YA and age at first calving (AFC) in Nellore cattle participating in a selection program. The traits were analyzed by the restricted maximum likelihood method under a multiple-trait animal model. For all traits, contemporary group was included as a fixed effect and additive genetic and residual as random effects. In addition to these effects, YA, YW and ADC were considered for analyzing T. In the case of SC and AFC, the effect of long YW was included as a covariate. Genetic parameters were estimated for and between traits. The three covariates significantly influenced T. The heritability estimates for T, SC and AFC were 0.18 6 0.02, 0.53 6 0.04 and 0.23 6 0.08, respectively. The genetic correlations between T and SC, and T and AFC were 20.07 6 0.17 and 20.06 6 0.19, respectively. The genetic correlation estimated between SC and AFC was 20.57 6 0.16. In conclusion, a response to selection for T, SC and AFC is expected and selection for T does not imply correlated responses with the other traits.

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Genetic effects on beef heifer puberty and subsequent reproduction

Cited by 153 publications

References 0 publications

Genetic relationship between cyclic ovarian activity in heifers and cows and beef traits in males

Genetic relationship between cyclic ovarian activity in heifers and cows and beef traits in males

Finding genes for economically important traits: Brahman cattle puberty

Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle

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