Genetic relationships among traits related to reproduction and growth of Nelore females

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

doi:10.1016/j.theriogenology.2014.06.001

Cited by 49 publications

(40 citation statements)

References 35 publications

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“…However, the multiple-trait analyses were effective in reducing the bias from selection, as previously stated by Schaeffer [22]. In addition, the posterior mean of the heritability for AFC of commercial animals on pasture obtained from the multiple-trait analysis was similar to the mean heritability of 0.17 obtained from three different samples of Nellore heifers [23–25]. …”

Section: Discussionsupporting

confidence: 64%

Selection of performance-tested young bulls and indirect responses in commercial beef cattle herds on pasture and in feedlots

et al. 2016

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BackgroundCentral testing is used to select young bulls which are likely to contribute to increased net income of the commercial beef cattle herd. We present genetic parameters for growth and reproductive traits on performance-tested young bulls and commercial animals that are raised on pasture and in feedlots.MethodsRecords on young bulls and heifers in performance tests or commercial herds were used. Genetic parameters for growth and reproductive traits were estimated. Correlated responses for commercial animals when selection was applied on performance-tested young bulls were computed.ResultsThe 90% highest posterior density (HPD90) intervals for heritabilities of final weight (FW), average daily gain (ADG) and scrotal circumference (SC) ranged from 0.41 to 0.49, 0.23 to 0.30 and 0.47 to 0.57, respectively, for performance-tested young bulls on pasture, from 0.45 to 0.60, 0.20 to 0.32 and 0.56 to 0.70, respectively, for performance-tested young bulls in feedlots, from 0.29 to 0.33, 0.14 to 0.18 and 0.35 to 0.45, respectively, for commercial animals on pasture, and from 0.24 to 0.44, 0.13 to 0.24 and 0.35 to 0.57 respectively, for commercial animals in feedlots. The HPD90 intervals for genetic correlations of FW, ADG and SC in performance-tested young bulls on pasture (feedlots) with FW, ADG and SC in commercial animals on pasture (feedlots) ranged from 0.86 to 0.96 (0.83 to 0.94), 0.78 to 0.90 (0.40 to 0.79) and from 0.92 to 0.97 (0.50 to 0.83), respectively. Age at first calving was genetically related to ADG (HPD90 interval = −0.48 to −0.06) and SC (HPD90 interval = −0.41 to −0.05) for performance-tested young bulls on pasture, however it was not related to ADG (HPD90 interval = −0.29 to 0.10) and SC (HPD90 interval = −0.35 to 0.13) for performance-tested young bulls in feedlots.ConclusionsHeritabilities for growth and SC are higher for performance-tested young bulls than for commercial animals. Evaluating and selecting for increased growth and SC on performance-tested young bulls is efficient to improve growth, SC and age at first calving in commercial animals. Evaluating and selecting performance-tested young bulls is more efficient for young bulls on pasture than in feedlots.

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Section: Discussionsupporting

confidence: 64%

Selection of performance-tested young bulls and indirect responses in commercial beef cattle herds on pasture and in feedlots

et al. 2016

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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%

“…In beef cattle, the reproductive performance of the cows, which is represented by the number of calves born annually, is one of the main economic factors affecting the production system [1]. 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%

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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“…The estimates obtained here were similar to those reported in the literature for Zebu cattle raised in tropical environments. Boligon and Albuquerque [19] and Eler et al [20] estimated heritabilities of 0.10 and 0.18, respectively, for AFC1 in Nelore cattle. Pereira et al [7] and Panetto et al [21] reported estimates of 0.06 and 0.12 for FCI in Nelore and Guzerat cattle, respectively.…”

Section: Discussionmentioning

confidence: 97%

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

et al. 2015

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Genetic relationships among traits related to reproduction and growth of Nelore females

Cited by 49 publications

References 35 publications

Selection of performance-tested young bulls and indirect responses in commercial beef cattle herds on pasture and in feedlots

Selection of performance-tested young bulls and indirect responses in commercial beef cattle herds on pasture and in feedlots

Parameter estimates for reproductive and carcass traits in Nelore beef cattle

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

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