Two-trait random regression model to estimate the genetic association of scrotal circumference with female reproductive performance in Nelore cattle

Júnior, Mário Luiz Santana; Eler, Joanir Pereira; Bignardi, Annaíza Braga; Ferraz, José Bento Sterman

doi:10.1016/j.theriogenology.2015.02.003

Cited by 26 publications

(14 citation statements)

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“…The heritability estimate found in our study for AFC was equal to 0.24 AE 0.02. This estimate was higher than most of the consulted literature for the Nelore breed [4,[29][30][31]. Martínez-Velázquez et al [32] and Bernardes et al [33] obtained heritability estimates of 0.28 AE 0.06 and 0.09 AE 0.02 in Angus heifers and Tabapuã beef cattle, respectively.…”

Section: Traitsmentioning

confidence: 69%

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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: Traitsmentioning

confidence: 69%

“…For genetic correlation between AFC and scrotal circumference at 550 days of age, Pereira et al [41] found estimates which varied from À0.23 to À0.29. In addition, Santana et al [30] highlighted that scrotal circumference measures obtained after 440 days of age presented higher genetic correlations with AFC.…”

Section: Traitsmentioning

confidence: 99%

Parameter estimates for reproductive and carcass traits in Nelore beef cattle

et al. 2017

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“…Scrotal circumference is an easy trait to measure and has moderate to the high magnitude of heritability estimates (Gressler et al, 2000;Fridrich et al, 2005;Eler et al, 2006;Boligon et al, 2010b). Thus, scrotal circumference presents favorable genetic correlations between semen quantity and quality (Latif et al, 2009), age at puberty in females (Santana et al, 2015), and ponderal development (Ortiz Peña et al, 2001;Brito et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…The genetic correlation among body weights and scrotal circumference traits found in this work (Table 2) indicated that selection based on scrotal circumference will result in a correlated response in the same direction for growth traits and increase the productivity of herds. Irano et al (2016) performed GWAS for indicators of sexual precocity in Nelore cattle and found that windows with great effects for scrotal perimeter and sexual precocity traits were not superimposed, although there is a moderate genetic correlation between these traits in Nelore cattle (Santana et al, 2015). Camargo et al (2015), studying causal mutations, showed that highly significant SNP for andrological traits were not significant for female reproductive traits.…”

Section: Discussionmentioning

confidence: 99%

Genetic parameters, genetic trends, and principal component analysis for productive and reproductive traits of Guzera beef cattle

et al. 2019

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The objectives of this study were to estimate genetic parameters and genetic trends and perform principal component analysis for the following traits: body weight adjusted at 210 days of age (W210), one year (W365), and yearling or 450 days of age (W450); weight gain from birth to weaning or 210 days of age (WGBW), from weaning to 365 days of age (WGW365), and from one year to yearling (WGY); and scrotal circumference adjusted at 365 (SC365) and 450 (SC450) days of age of Guzera beef cattle. Variance components were estimated under a two-trait animal model using the restricted maximum likelihood method. The fixed effects included in the model were birth season, contemporary group, and covariable age of dam at calving as linear and quadratic effects. Heritability estimates ranged from 0.10 (WGY) to 0.41 (W450 and SC450). The studied traits could be used as selection criteria because of their sufficient additive genetic variability to respond to the selection process. However, lower selection efficiency is expected for WGBW and WGY. Genetic trends studied were significant for all traits, except WGY. The W365 and W450 traits belonged to the "Genetic Merit Total" index and responded to selection with favorable genetic gain per year. The traits that were not included in the selection index showed favorable positive genetic correlations attributed to the indirect selection processes. The principal component analysis identified two groups of traits. The first group related to body weight and weight gain and the second related to the scrotal circumference, indicating that selection could be applied to one group of traits within each observed group. The genetic gains were attributed in the same direction for the other traits belonging to the groups. Thus, we recommend selecting animals for W365 based on first group, and SC365 based on second.

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“…Although the females' reproductive traits are indicated as selection criteria, the scrotal circumference is widely used in breeding programs because it is associated with reproductive efficiency of males and females (Santana Júnior, Eler, Bignardi, & Ferraz, 2015;Silva et al, 2011;Terakado, Boligon, Baldi, Silva, & Albuquerque, 2015). Recent studies with Nellore animals suggest that the scrotal circumference obtained at younger ages could be a reasonable indicator of female puberty (Santana Júnior et al, 2015;Silva et al, 2011;Terakado et al, 2015), since the genetic parameters for scrotal circumference change according to the animal age at measurement (Boligon, Baldi, & Albuquerque, 2011). In addition, the bull selection is an efficient way of obtaining genetic progress due the higher selection intensity applied to males rather than females.…”

Section: Introductionmentioning

confidence: 99%

Direct and maternal annual genetic changes for selected traits at weaning and yearling in beef cattle

Boligon

Vicente

Roso³

et al. 2018

Acta Sci. Anim. Sci.

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Heritability and direct and maternal genetic changes were estimated in Nellore cattle for the following traits: birth to weaning weight gain (BWG), weaning to yearling weight gain (YWG), weaning conformation (WC), weaning precocity (WP), weaning muscling (WM), yearling conformation (YC), yearling precocity (YP), yearling muscling (YM) and yearling scrotal circumference (SC). Direct and maternal heritability for weaning traits were 0.21±0.03 and 0.13±0.01 (BWG); 0.19±0.03 and 0.07±0.01 (WC); 0.22±0.03 and 0.07±0.01 (WP); 0.20±0.03 and 0.07±0.01 (WM), respectively. For yearling traits, direct heritability were 0.19±0.04 (YWG); 0.32±0.05 (YC); 0.37±0.05 (YP); 0.38±0.05 (YM) and 0.41±0.04 (SC). Positive and significant direct genetic changes (p < 0.05) were found for all traits, except for WC (p = 0.09), equal to 0.138 kg year-1 (BWG), 0.003 units year-1 (WC), 0.011 units year-1 (WP), 0.009 units year-1 (WM), 0.132 kg year-1 (YWG), 0.003 units year-1 (YC), 0.011 units year-1 (YP), 0.011 units year-1 (YM) and 0.020 cm year-1 (SC), indicating favorable genetic gains in the period. For weaning traits, we obtained negative and non-significant (p > 0.05) maternal genetic trends, with values of -0.084 kg year-1 (BWG), -0.004 units year-1 (WC), -0.004 units year-1 (WP) and -0.004 units year-1 (WM). Thus, greater emphasis should be given for maternal genetic merit of weaning traits in this population, if improvements in maternal ability were desirable.

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Two-trait random regression model to estimate the genetic association of scrotal circumference with female reproductive performance in Nelore cattle

Cited by 26 publications

References 28 publications

Parameter estimates for reproductive and carcass traits in Nelore beef cattle

Parameter estimates for reproductive and carcass traits in Nelore beef cattle

Genetic parameters, genetic trends, and principal component analysis for productive and reproductive traits of Guzera beef cattle

Direct and maternal annual genetic changes for selected traits at weaning and yearling in beef cattle

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