Heritability estimates and genetic correlations for body weight and scrotal circumference adjusted to 12 and 18 months of age for male Nellore cattle

Frizzas, O. G.; Grossi, D. A.; Buzanskas, Marcos Eli; Paz, Cláudia Cristina Paro de; Bezerra, Luiz Antônio Framartino; Lôbo, Raysildo Barbosa; Oliveira, João Ademir de; Munari, Danísio Prado

doi:10.1017/s175173110800373x

Cited by 27 publications

(21 citation statements)

References 27 publications

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“…Thus, these traits provided evidence that a substantial proportion of the variation in these traits is determined by genes of additive action and could respond to selection. Similar results were observed by Frizzas et al [5] for scrotal circumference measured at 12 and 18 months of age in Nelore cattle. Terakado et al [20] obtained direct heritability estimates for SC365 and SC450 equal to 0.35 and 0.40, respectively.…”

Section: Traitssupporting

confidence: 91%

“…The genetic improvement of reproductive traits in females is generally challenging due to difficulties in measuring the traits as well as to the low genetic variability, which results in a slow response to selection [2][3][4]. Thus, breeding programs have been considering reproductive measures taken in males (i.e., scrotal circumference) in the selection criteria due to moderate to high heritability estimates and ease of measurement [5].…”

Section: Introductionmentioning

confidence: 99%

“…Scrotal circumference is indicative of fertility and development in beef cattle, due to favorable genetic correlations with reproductive traits (semen volume, age at puberty in males and related females, and heifer pregnancy) [6][7][8] and production traits (body weight and longissimus muscle area) [5,9,10].…”

Section: Introductionmentioning

confidence: 99%

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Parameter estimates for reproductive and carcass traits in Nelore beef cattle

et al. 2017

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The aim of this study was to estimate genetic parameters for scrotal circumference at 365 (SC365) and 450 (SC450) days of age, age at first calving (AFC), ribeye area (REA), backfat (BF) thickness, and rump fat (RF) thickness, in order to provide information on potential traits for Nelore cattle breeding program. Genetic parameters were estimated using the Average Information Restricted Maximum Likelihood method in single- and multitrait analyses. Four different animal models were tested for SC365, SC450, REA, BF, and RF in single-trait analyses. For SC365 and SC450, the maternal genetic effect was statistically significant (P < 0.01) and was included for multitrait analyses. The direct heritability estimates for SC365, SC450, AFC, REA, BF, and RF were equal to 0.31, 0.38, 0.24, 0.32, 0.16, and 0.19, respectively. Maternal heritability for SC365 and SC450 was equal to 0.06 and 0.08, respectively. The highest genetic correlations were found among the scrotal circumferences. Testing for the inclusion of maternal effects in genetic parameters estimation for scrotal circumference should be evaluated in the Nelore breeding program, mostly for correctly ranking the animal's estimated breeding values. Similar heritability estimates were observed for scrotal circumference, as well as favorable genetic correlations of this trait with AFC and carcass traits. Thus, scrotal circumference measured at 365 days of age could be a target trait for consideration in the Nelore selection index in order to improve most of the traits herein analyzed.

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Section: Traitssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Parameter estimates for reproductive and carcass traits in Nelore beef cattle

et al. 2017

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“…Alencar et al (1993) estimated heritabilities for SC at 18 months of age in Canchim animals and obtained a value of moderate magnitude (0.36). For Nelore cattle, heritability estimates for SC in yearling ranging from 0.42 to 0.65 have been reported Grossi et al, 2009;Frizzas et al, 2009).…”

Section: Heritabilitymentioning

confidence: 99%

Genetic associations between stayability and reproductive and growth traits in Canchim beef cattle

et al. 2010

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Stayability is a trait that has a large impact on the costs of rural properties because it is directly related to the cow's ability to produce a certain number of calves over a given period of time. Thus, the objective of this study was to estimate the genetic variance of stayability (STAY) and its genetic associations with age at first calving (AFC), body weight of males and females at 420 days of age (BW420), and scrotal circumference at 420 days of age (SC420), in order to provide support for a genetic evaluation program on Canchim beef cattle. Genetic parameters were estimated by Bayesian inference using the THRGIBBS2F90 program, considering two-trait analysis between STAY and the other traits. A threshold model was established for STAY and a linear model was established for all other traits. The animal model included the contemporary group as the fixed effect and the genetic additive and residual effects as random effects. The heritability estimates and their respective standard deviations (in parentheses) obtained for STAY, AFC, BW420 and SC420 were 0.03 (0.01), 0.04 (0.01), 0.24 (0.04) and 0.24 (0.06), respectively. STAY presented genetic associations with AFC, BW420 and SC420 of − 0.63 (0.20), − 0.09 (0.11) and 0.45 (0.21), respectively. It had environmental correlations with AFC and BW420 of 0.02 (0.01) and − 0.06 (0.04). For SC420, the environmental covariance was set at zero. Selection for BW420 would not contribute towards improving STAY because the genes that acted on one trait did not act on the other. However, selection to increase SC420 should result in changes in this trait and also favor STAY. Despite the favorable genetic correlation estimates between AFC and STAY, the selection response for both traits would be low. Changes in management and environmental conditions could improve both traits.

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“…Growth traits such as body weight, which are measured from the early stage of development of the animal until older ages, are important for determining the economic efficiency of any production system. These measures are traditionally included in the selection criteria of beef cattle breeding programs as they are directly related to meat production and exhibit heritability of moderate to high magnitude, indicating that selection for these traits is effective (Frizzas et al, 2009). The genetic correlation between growth traits varies from moderate to high (Boligon et al, 2009;Baldi et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Genome-wide association study for growth traits in Nelore cattle

Terakado

Costa

Camargo

et al. 2018

Animal

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The objective of this study was to investigate the association of single nucleotide polymorphisms (SNPs) with birth weight, weight gain from birth to weaning and from weaning to yearling, yearling height and cow weight in Nelore cattle. Data from 5064 animals participating in the DeltaGen and PAINT breeding programs were used. The animals were genotyped with a panel of 777 962 SNPs (Illumina BovineHD BeadChip) and 412 993 SNPs remained after quality control analysis of the genomic data. A genome-wide association study was performed using a single-step methodology. The analyses were processed with the BLUPF90 family of programs. When applied to a genome-wide association studies, the single-step GBLUP methodology is an iterative process that estimates weights for the SNPs. The weights of SNPs were included in all analyses by iteratively applying the single-step GBLUP methodology and repeated twice so that the effect of the SNP and the effect of the animal were recalculated in order to increase the weight of SNPs with large effects and to reduce the weight of those with small effects. The genome-wide association results are reported based on the proportion of variance explained by windows of 50 adjacent SNPs. Considering the two iterations, only windows with an additive genetic variance >1.5% were presented in the results. Associations were observed with birth weight on BTA 14, with weight gain from birth to weaning on BTA 5 and 29, with weight gain from weaning to yearling on BTA 11, and with yearling height on BTA 8, showing the genes TMEM68 (transmembrane protein 8B) associated with birth weight and yearling height, XKR4 (XK, Kell blood group complex subunit-related family, member 4) associated with birth weight, NPR2 (natriuretic peptide receptor B) associated with yearling height, and REG3G (regenerating islet-derived 3-gamma) associated with weight gain from weaning to yearling. These genes play an important role in feed intake, weight gain and the regulation of skeletal growth.

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Heritability estimates and genetic correlations for body weight and scrotal circumference adjusted to 12 and 18 months of age for male Nellore cattle

Cited by 27 publications

References 27 publications

Parameter estimates for reproductive and carcass traits in Nelore beef cattle

Parameter estimates for reproductive and carcass traits in Nelore beef cattle

Genetic associations between stayability and reproductive and growth traits in Canchim beef cattle

Genome-wide association study for growth traits in Nelore cattle

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