Genetic associations of visual scores with subsequent rebreeding and days to first calving in Nellore cattle

Boligon, Arione Augusti; Ayres, Denise Rocha; Pereira, Rodrigo Junqueira; Morotti, N. P.; Albuquerque, Lúcia Galvão de

doi:10.1111/j.1439-0388.2012.00998.x

Cited by 11 publications

(22 citation statements)

References 26 publications

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“…Higher heritability estimates were reported by Barichello et al (2010) in Canchim cattle for the same trait, which was assessed at weaning, and varied from 0.17 to 0.27. Heritability estimates for other visual score assessments in Nellore and Angus herds obtained at the weaning and yearling stages have ranged from 0.19 to 0.38 (Cardoso et al, 2004;Boligon and Albuquerque, 2010;Faria et al, 2009Faria et al, , 2010Koury Filho et al, 2010;Boligon et al, 2012;Wenceslau et al, 2012). These differences in heritability estimates could be caused by differences in the definition of visual assessment scores, the model applied to estimate the (co)variance components, as well as to differences in genetic and environmental variability between the populations or herds studied.…”

Section: Resultsmentioning

confidence: 99%

“…Boligon and Albuquerque (2010) studied Nellore cattle, and estimated low genetic correlations between AFC and yearling scores of conformation (-0.26 ± 0.01), precocity (-0.29 ± 0.02), and muscling (-0.23 ± 0.02). Recently, Boligon et al (2012) obtained low and favorable genetic correlations between days to first calving and yearling scores of conformation, precocity, and muscling, which ranged from -0.11 ± 0.09 to -0.19 ± 0.09. Therefore, the selection of animals with a good body composition as evaluated by visual slaughter conformation scores in yearlings would not affect female sexual precocity.…”

Section: Resultsmentioning

confidence: 99%

“…Selection based on visual slaughter conformation scores has the potential to improve overall performance in Nellore cattle, as indicated by favorable correlations with weight at different ages (Faria et al, 2009;Koury Filho et al, 2010), carcass traits measured by ultrasound (Gordo et al, 2012), and reproductive and sexual precocity traits (Boligon et al, 2012). Although visual slaughter conformation scores are used as selection criteria in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Genetic correlations between visual slaughter conformation scores and growth and reproductive traits in Canchim cattle

et al. 2016

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ABSTRACT. We obtained heritability and (co)variance component estimates for slaughter conformation scores at 420 days of age (SCS 420 ), age at calving (first, AFC; second, ASC), calving occurrence until 38 months of age (CP 38 ), weight at 420 days of age (W 420 ), and scrotal circumference at 420 days (SC 420 ) in Canchim (5/8 Charolais + 3/8 Zebu) cattle. A total of 23,168 records of Canchim animals, including 12,493 females and 10,675 males, were analyzed. SCS 420 indicated carcass structure, muscle development, and subcutaneous fat deposition. The slaughter conformation score of each animal was relative to the whole contemporary group; 1 corresponded to the lowest expression of the trait and 6 to the highest. Heritabilities, and genetic and residual correlation estimates between SCS 420 and reproductive and weight traits, were estimated by multitrait analyses using an animal model with Bayesian inference, employing a linear model for AFC, ASC, SC420, and W420 and a threshold model for CP38 and SCS420. Heritability estimates for SCS 420 , AFC, ASC, CP 38 , W 420 , and SC 420 were 0.11, 0.15, 0.15, 0.15, 0.30, and 0.30, respectively. Genetic correlation estimates between SCS 420 and the other traits were 0.08 (AFC), 0.58 (ASC), 0.08 (CP 38 ), 0.43 (W 420 ), and 0.17 (SC 420 ). Visual slaughter conformation scores respond to individual selection and can be used as selection criteria in Canchim cattle. Selection to improve sexual precocity would not be effective in improving carcass conformation and composition, and selection for animals with high breeding values for yearling weight may improve slaughter conformation at the yearling stage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic correlations between visual slaughter conformation scores and growth and reproductive traits in Canchim cattle

et al. 2016

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“…Although rules exist for the judging of Zebu animals, cattle ranking in championships is a subjective trait like other traits used in beef cattle breeding programs in Brazil, e.g., visual scores of conformation, muscling, structure, and navel, among others (Van Melis et al, 2003;Faria et al, 2009;Boligon et al, 2012). For animals ranking in championships, competitions could be structured according to the level (or importance) of the event, i.e., there are more important competitions in which very good animals participate and the level can be considered high, or vice-versa.…”

Section: Resultsmentioning

confidence: 99%

Ranking of Nellore animals in cattle championships: genetic parameters and correlations with production traits

et al. 2014

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ABSTRACT. Records of 17,141 Nellore cattle participating in cattle championships, born from 1994-2009, were used to estimate genetic parameters between animal rank in cattle championships, evaluated from weaning to 36 months of age as repeated traits, and growth, fertility, and carcass traits, evaluated at 365 days of age as single traits. Two traits were defined for animal rank in cattle championships: value 1 was attributed to animals ranked from 1st to 3rd place within the age category, and value 0 was assigned to the remaining animals (TOP3). Value 1 was attributed to animals ranked from 1st to 5th place within the age category and value 0 was assigned to the remaining animals (TOP5). The (co)variance components were estimated based on Bayesian inference under a 2-trait threshold-linear animal model. The posterior means of heritability estimated for TOP3 and TOP5 were 0.182 ± 0.010 and 0.260 ± 0.012, respectively, and their repeatabilities were 0.341 ± 0.007 and 0.400 ± 0.007, respectively. High-ranking animals generally presented higher breeding values for body weight, height, Champion cattle ranking and Production traits body length, and heart girth. The phenotypic correlations indicate that judges of cattle championships primarily rank animals based on weight and heart girth.

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“…The methodologies vary according to the number of evaluated traits, the nature of the phenotypic data distribution, the genetic structure adopted and the estimation method of the variance components. For example, by the assumption of linear (Gordo et al, 2012;Forutan, Mahyari, & Sargolzaei, 2015) or threshold distribution of phenotypes (Faria et al, 2009;Boligon et al, 2012;Forutan, Mahyari, & Sargolzaei, 2015), by using sire or animal models (Forutan, Mahyari, & Sargolzaei, 2015); and by adopting restricted maximum likelihood (Bouquet et al, 2010;Queiroz et al, 2011), Bayesian (Boligon et al, 2012;Santana Jr. et al, 2013) or generalized linear mixed model approaches (Forutan, Mahyari, & Sargolzaei, 2015) as estimation methods. These methodologies can be applied in a combined way.…”

Section: Introductionmentioning

confidence: 99%

Categorical Visual Score Traits of a Nellore Beef Cattle Population

Júnior¹,

Petrini²,

Mourão³

et al. 2017

JAS

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Variance components and genetic parameters of economically relevant traits in livestock, whether continuous or categorical, can be estimated by methods computationally available providing support for the selection and mating of animals in breeding programs. The objectives of this paper were to obtain and compare the variance components estimates for visual traits under continuous or categorical distribution in single-trait analysis and their correlations with continuous productive traits in two-trait analysis. Data of conformation (CONF), precocity of fat deposition (PREC) and muscling (MUSC) visual scores evaluated at 18 months of age as well as the weight at 18 months of age (YW) were collected from animals born from 2000 to 2012, in Nellore cattle herds raised in Southeastern and Central Western tropical regions of Brazil. Methods III of Henderson, Restricted Maximum Likelihood (REML), Bayesian Inference and generalized linear mixed model (GLMM) were tested. Variance components obtained from single-trait analysis were similar to those obtained from two-trait analysis. The estimates of heritability (h 2 ) for the visual scores ranged from 0.1081 to 0.2190. Heritability estimates for traits evaluated by visual scores have moderate to high magnitude justifying the inclusion of visual scores as selection criteria in animal breeding and the selection of animals with higher scores for mating. High genetic correlations between yearling weight and morphological traits were verified. For visual scores of conformation, precocity and muscling, the most suitable model based on one-trait or two-trait analyses considered an animal model, a linear distribution of the data and the estimation method of the components of (co)variance based on Bayesian methodology.

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Genetic associations of visual scores with subsequent rebreeding and days to first calving in Nellore cattle

Cited by 11 publications

References 26 publications

Genetic correlations between visual slaughter conformation scores and growth and reproductive traits in Canchim cattle

Genetic correlations between visual slaughter conformation scores and growth and reproductive traits in Canchim cattle

Ranking of Nellore animals in cattle championships: genetic parameters and correlations with production traits

Categorical Visual Score Traits of a Nellore Beef Cattle Population

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