Reproductive Traits Selection in Nelore Beef Cattle

Moreira, Heverton Luís; Buzanskas, Marcos Eli; Munari, Danísio Prado; Canova, Érika Breda; Lôbo, Raysildo Barbosa; Paz, Cláudia Cristina Paro de

doi:10.1590/s1413-70542015000400006

Cited by 19 publications

(17 citation statements)

References 28 publications

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“…The annual mean genetic change obtained in the present study for SC was close to the value of 0.04% reported for the same trait by Laureano et al (2011). Similarly, Moreira et al (2015) described genetic gain of 0.025 and 0.034 cm year -1 for scrotal circumference at 365 and 450 days of age, in Nellore herds. Evaluating animals of Guzerat breed, Grupioni, Guidolin, Venturini, Lôbo, and Munari (2015) reported a favorable and significant genetic increase for scrotal circumference measured at 365 and 450 days of age, with gains of 0.040 and 0.020 cm year -1 , respectively, which could be due to direct selection process, since these traits are considered in the index used.…”

Section: Resultssupporting

confidence: 88%

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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Section: Resultssupporting

confidence: 88%

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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“…All methods showed moderate heritabilities (Table 3) for AFC (0.18 to 0.20); with the exception of the TLcens (0.09). In general, heritability estimates for AFC reported in the literature oscillated such as in the present study, ranging from 0.10 to 0.37 in Brazilian Zebu cattle (Boligon and Albuquerque, 2011;Barrozo et al, 2012;Moreira et al, 2015;Oliveira et al, 2017). Variation in Table 1 Average mean square error (MSE) and correlations between observed and predicted phenotypes from 10 fold cross-validation with respective standard deviation.…”

Section: Resultssupporting

confidence: 49%

Censored Bayesian models for genetic evaluation of age at first calving in Brazilian Brahman cattle

et al. 2019

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We compared different Bayesian models to handle censored data for genetic parameters estimation of age at first calving (AFC) in Brazilian Brahman cattle. Data from females with AFC above 1825 days of age were assumed to have failed to calve and were considered as censored records. Data including information of 53,703 cows were analyzed through the following methods: conventional linear model method (LM), which consider only uncensored records; simulation method (SM), in which the data were augmented by drawing random samples from positive truncated normal distributions; penalty method (PM), in which a constant of 21 days was added to censored records; and the bivariate threshold-linear method (TLcens). The LM was the most suited for genetic evaluation of AFC in Brazilian Brahman cattle based on the predictive ability evaluation through cross-validation analysis. The similar results for LM and PM regarding Spearman correlations, and the higher percentages of selected animals in common, indicated that there was not relevant reranking of animals when censored records were used. In summary, the heritability estimates for AFC ranged from 0.09 (TLcens) to 0.20 (LM). Given its poor predictive performance, the SM is not recommended for handling censored records for genetic evaluation of AFC.

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“…Grossi et al (2009); Buzanskas et al (2010) and Bernardes et al (2015) estimated lower AFC heritability for Nellore, Canchim and Tabapuã cattle, respectively. Moreira et al (2015) and Silva et al (2016) reported higher AFC heritability estimates, 0·2 ± 0·01 and 0·3 ± 0·06 for Nellore and Gir, respectively. These findings would predict that direct selection for AFC might result in slow improvement compared to selection for other reproductive traits such as HP.…”

Section: Discussionmentioning

confidence: 91%

Genetic analysis of visual assessment and body weight traits and their relationships with reproductive traits in Nellore cattle

Paterno

Buzanskas

Filho³

et al. 2017

J. Agric. Sci.

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SUMMARYGenetic parameters for visual assessment traits measured at 487 days of age (body structure (BS), finishing precocity (FP) and muscling (MS)), body weight at 450 days of age (W450), age at first calving (AFC), heifer pregnancy (HP) and stayability (STAY, i.e. the probability of a cow to produce at least three calves before reaching 76 months of age) were estimated in Nellore cattle, seeking to include these traits in the selection criteria for dams. The statistical models included additive genetic and residual random effects using single- and two-trait Bayesian analyses. The average heritability estimates were equal to 0·37 for BS, 0·42 for FP, 0·37 for MS and 0·48 for W450. Age at first calving had a low average heritability estimate (0·13), while HP and STAY estimates were higher (0·36 and 0·24, respectively). The genetic correlations between AFC, HP and STAY with visual assessment traits and body weight were favourable, indicating that selecting animals with higher BS, FP, MS and W450 values will result in the indirect selection of animals with lower AFC and successful scores for HP and STAY. The selection of heifers that present an early pregnancy should anticipate AFC and improve HP in the current herd. Except for AFC, the heritability and genetic correlation estimates between the studied traits justify their inclusion in the selection criteria of the Nellore breeding programme.

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Reproductive Traits Selection in Nelore Beef Cattle

Cited by 19 publications

References 28 publications

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

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

Censored Bayesian models for genetic evaluation of age at first calving in Brazilian Brahman cattle

Genetic analysis of visual assessment and body weight traits and their relationships with reproductive traits in Nellore cattle

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