Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle

Boligon, Arione Augusti; Albuquerque, Lúcia Galvão de

doi:10.1590/s1516-35982012000300017

Cited by 5 publications

(4 citation statements)

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“…The Geweke test [ 26 ] indicated convergence of the chains ( Table 1 ). The heritability was 0.19 for HR and NC53 ( Table 1 ), in agreement with the estimates reported in other studies on the Nellore breed [ 2 , 5 , 6 ]. This result indicates that, in addition to being highly influenced by the environment, HR and NC53 are affected by an additive genetic component, a finding justifying the execution of GWAS.…”

Section: Resultssupporting

confidence: 91%

“…Heifers that conceive soon after the first calving permit a fast return on investments. HR has been considered as a selection criterion in some breeding programs, particularly in indicine breeds [ 1 , 2 ] as cows of these breeds usually present low rebreeding rates [ 3 ]. This trait shows a high genetic correlation with other important reproductive traits such as age at first calving [ 4 ] and stayability [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Genome-wide association study provides strong evidence of genes affecting the reproductive performance of Nellore beef cows

et al. 2017

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Reproductive traits are economically important for beef cattle production; however, these traits are still a bottleneck in indicine cattle since these animals typically reach puberty at older ages when compared to taurine breeds. In addition, reproductive traits are complex phenotypes, i.e., they are controlled by both the environment and many small-effect genes involved in different pathways. In this study, we conducted genome-wide association study (GWAS) and functional analyses to identify important genes and pathways associated with heifer rebreeding (HR) and with the number of calvings at 53 months of age (NC53) in Nellore cows. A total of 142,878 and 244,311 phenotypes for HR and NC53, respectively, and 2,925 animals genotyped with the Illumina Bovine HD panel (Illumina®, San Diego, CA, USA) were used in GWAS applying the weighted single-step GBLUP (WssGBLUP) method. Several genes associated with reproductive events were detected in the 20 most important 1Mb windows for both traits. Significant pathways for HR and NC53 were associated with lipid metabolism and immune processes, respectively. MHC class II genes, detected on chromosome 23 (window 25-26Mb) for NC53, were significantly associated with pregnancy success of Nellore cows. These genes have been proved previously to be associated with reproductive traits such as mate choice in other breeds and species. Our results suggest that genes associated with the reproductive traits HR and NC53 may be involved in embryo development in mammalian species. Furthermore, some genes associated with mate choice may affect pregnancy success in Nellore cattle.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Genome-wide association study provides strong evidence of genes affecting the reproductive performance of Nellore beef cows

et al. 2017

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“…These estimates are similar to those reported in the literature for the same traits in Nellore animals (Laureano et al, 2011;Boligon and de Albuquerque, 2012;Ferriani et al, 2013). All traits should, therefore, respond rapidly to direct selection, except for GWY, which exhibited a heritability of 0.12.…”

Section: Resultssupporting

confidence: 88%

Genetic association of growth traits with carcass and meat traits in Nellore cattle

Tonussi¹,

Espigolan²,

Gordo³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. The aim of this study was to estimate genetic and phenotypic associations of growth traits with carcass and meat traits in Nellore cattle. Data from male and female animals were used for weaning weight (WW; N = 241,416), yearling weight (YW, N = 126,596), weight gain from weaning to yearling (GWY, N = 78,687), and yearling hip height (YHH, N = 90,720), respectively; 877 male animals were used for hot carcass weight (HCW) and 884 for longissimus muscle area (LMA), backfat thickness (BT), marbling score (MS), and shear force (SF). The variance components were estimated by the restricted maximum likelihood method using three-trait animal models that included WW. The model for WW included direct and maternal additive genetic, maternal permanent environmental, and residual effects as random effects; contemporary group as fixed effects; and age of dam at calving and age of animal as covariates (linear and quadratic effects). For the other traits, maternal effects and the effect of age of dam at calving were excluded from the model. Heritability ranged from 0.10 ±

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“…Studies show that this trait is Table 3 Estimates of marginal posterior distributions of variance components and heritabilities, obtained in bi-trait analyses, for number of calvings at 53 months (NC53), heifers rebreeding (HR), stayability (STAY) and scrotal circumference (SC) of Nellore Cattle strongly influenced by environmental factors (Pereira, 2008;Boligon and Albuquerque, 2012), as heifers have to conciliate pregnancy and subsequent lactation concomitant to their own growth. The heritability estimated in the present study for this trait was low (0.15 ± 0.021, Table 3) and similar to the value of 0.14 reported by Boligon and Albuquerque (2012), confirming the large influence of environmental effects on this trait.…”

Section: Resultsmentioning

confidence: 99%

Genetic relationship among reproductive traits in Nellore cattle

Guarini¹,

Neves²,

Schenkel

et al. 2015

Animal

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In order to achieve improvements in production efficiency in livestock, herds of high sexual precocity and good fertility are needed. These traits increase the availability of animals in herd, either for sale or selection, allowing both greater selective intensity and greater genetic progress. This study aimed at estimating genetic parameters for reproductive traits measured directly in females in order to verify whether they could be used as selection criteria for genetic improvement in Nellore cows, as well as estimating the genetic relationship among these traits and scrotal circumference (SC), the traditional selection criterion for sexual precocity in cattle. In addition to SC, stayability (STAY), number of calvings at 53 months (NC53) and heifers rebreeding (HR) were studied. The (co)variances and genetic parameters were estimated using Bayesian inference. STAY, NC53 and HR were analyzed assuming a threshold model, whereas SC was analyzed with a linear model. Heritability estimated for NC53 was 0.22, and this trait was strongly and positively correlated with STAY, meaning selection for NC53 would improve productive longevity of Nellore cows. Correlations estimated between HR and STAY (≈0.97) and between HR and NC53 (≈0.99) allow an improvement on HR rates if selection was applied to traits related to longevity. Genetic correlations among SC and female reproductive traits were positive but weak, suggesting the need to use reproductive traits directly measured in females in order to obtain greater improvements in sexual precocity and longevity.

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Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle

Cited by 5 publications

References 10 publications

Genome-wide association study provides strong evidence of genes affecting the reproductive performance of Nellore beef cows

Genome-wide association study provides strong evidence of genes affecting the reproductive performance of Nellore beef cows

Genetic association of growth traits with carcass and meat traits in Nellore cattle

Genetic relationship among reproductive traits in Nellore cattle

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