Estimates of genetic parameters and genetic trends for reproductive traits and weaning weight in Tabapuã cattle1,2

Bernardes, Priscila Arrigucci; Grossi, D. A.; Savegnago, Rodrigo Pelicioni; Buzanskas, Marcos Eli; Urbinati, Ismael; Bezerra, Luiz Antônio Framartino; Lôbo, Raysildo Barbosa; Munari, Danísio Prado

doi:10.2527/jas.2015-9212

Cited by 16 publications

(13 citation statements)

References 34 publications

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“…For W210, the direct heritability estimates were in agreement with those obtained by Zuin et al (2012), Bernardes et al (2015), and Pires et al (2016) for the Nelore, Tabapuã, and Canchim breeds. Lopes et al (2016), Vargas et al (2014), and Mota et al (2013) observed h 2 d for W450 in Nelore, Brahman, and Simmental animals of 0.52 ± 0.02, 0.22 ± 0.06, and 0.27, respectively.…”

Section: Resultssupporting

confidence: 82%

Evaluation of body weight and visual scores for genetic improvement of Nelore cattle

Paterno

Buzanskas

Filho³

et al. 2016

Trop Anim Health Prod

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The aims of our study were to estimate genetic parameters for body weight and visual scores and to evaluate their inclusion as selection criteria in the Nelore breeding program in Brazil. The traits studied were the body weight adjusted to 210 (W210) and to 450 (W450) days of age and visual scores for body structure, finishing precocity, and muscling evaluated at weaning (BS, FP, and MS) and yearling (BS, FP, and MS) ages. A total of 33,242, 26,259, 23,075, and 26,057 observations were considered to analyze W210, W450, and visual scores at weaning and yearling. The significant (P < 0.05) fixed effects for all traits were farm, birth season, birth year, sex, and management group. Single-trait analyses were performed to define the most fitting model to our data using the average information restricted maximum likelihood algorithm, for weaning traits. Subsequently, these models were used in single- and two-trait analyses considering the Bayesian inference algorithm. Two-trait Bayesian analyses resulted in average direct heritability estimates for BS, FP, MS, W210, BS, FP, MS, and W450 of 0.28, 0.30, 0.27, 0.28, 0.40, 0.44, 0.39, and 0.50, respectively. Genetic correlations varied from 0.40 to 0.96. Benefits to animal performance can best be achieved by considering body structure, finishing precocity, and muscling as selection criteria in the Nelore breeding programs. The decision to use visual scores measured at weaning should be considered in order to decrease generation interval and assist pre-selecting individuals, expecting carcass improvements in the future progeny.

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Section: Resultssupporting

confidence: 82%

Evaluation of body weight and visual scores for genetic improvement of Nelore cattle

Paterno

Buzanskas

Filho³

et al. 2016

Trop Anim Health Prod

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“…Furthermore, in the present study, the estimated heritability of GL (0.081) was consistent with that in in Japanese Black cows (0.080) [28], whereas it is lower (0.037) in the Rubia Gallega breed [15]. In our study, AFC was the reproductive trait that demon strated the highest heritability (0.180), which was consistent with (0.215) in Japanese Black cattle [18], higher heritability (0.28) in Angus heifers [8], and lower heritability (0.09) in the Tabapuã beef breed [29].…”

Section: F-value P-value F-value P-value F-value P-value F-value P-vasupporting

confidence: 83%

Genetics of heifer reproductive traits in Japanese Black cattle

Setiaji

Oikawa

2020

Asian-Australas J Anim Sci

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Objective: The objective of this study was to identify environmental factors strongly asso ciated with and to estimate genetic parameters of reproductive traits in Japanese Black heifers. Methods: Data included reproduction records of Japanese Black heifers born between 2004 and 2014. First service nonreturn rate (NRR) to 56 days from first to successful insemination (FS), number of services per conception (IN), age at first calving (AFC) and gestation length were analyzed with the use of the general linear model. Genetic parameters were estimated with the use of the univariate animal model of the residual maximum likelihood. Results: Averages of reproductive traits over eleven years were assessed, and the effects of farm, year, month, artificial insemination technician and interaction of farm×year on the traits were determined. Estimated heritability of FS was very low and that of AFC was higher than that of the other traits. A close genetic relation was observed among NRR, IN, and FS; however, their heritabilities were very low. AFC shows favorable genetic correlation with IN and FS. Conclusion: Low heritabilities of most reproductive traits in Japanese Black heifers are strongly influenced by farm management practices, and that large residual variances make genetic evaluation difficult. Among the reproductive traits, AFC is potentially more useful for genetic improvement of heifer reproductive traits because it has high heritability and favorable genetic correlations with IN and FS.

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“…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: 66%

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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Estimates of genetic parameters and genetic trends for reproductive traits and weaning weight in Tabapuã cattle1,2

Cited by 16 publications

References 34 publications

Evaluation of body weight and visual scores for genetic improvement of Nelore cattle

Evaluation of body weight and visual scores for genetic improvement of Nelore cattle

Genetics of heifer reproductive traits in Japanese Black cattle

Parameter estimates for reproductive and carcass traits in Nelore beef cattle

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