Estimativas de parâmetros genéticos para os escores visuais e suas associações com peso corporal em bovinos de corte

Filho, W. Koury; Albuquerque, Lúcia Galvão de; Forni, S.; Vasconcelos, J.A.; Yokoo, M. J. I.; Alencar, M. M. de

doi:10.1590/s1516-35982010000500011

Cited by 51 publications

(40 citation statements)

References 16 publications

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“…Although Murrah buffalo cows had the shortest body length, their thoracic perimeter was statistically similar to that of the Mediterranean. The thoracic perimeter together with the body length form an anatomical area related to the limits of muscular tissue development and gain weight capacity (Koury Filho et al, 2010). Therefore, it is recommended to select buffalo cows within the herd considering their greater precocity and lower height in relation to thoracic perimeter and body length (Menezes et al, 2012;Rezende et al, 2014b).…”

Section: Resultsmentioning

confidence: 99%

“…Using Genes software (Universidade Federal de Viçosa, MG, Brazil), the method of Singh (1981), based on the average Euclidean distance, was used to reduce the number of variables, thus eliminating those that did not contribute much to breed differentiation considering three groups of characteristics (linear measures, pelvic measures and zootechnical indexes). Subsequently, the similarity degree between breeds was evaluated using principal component analysis, in scatter biplot graphs developed in Past software (Hammer et al, 2001). The dissimilarity matrices between breeds were calculated using the generalized Mahalanobis distance D 2 in the Genes program.…”

Section: Methodsmentioning

confidence: 99%

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Phenotypic diversity in buffalo cows of the Jafarabadi, Murrah, and Mediterranean breeds

Rezende

Ferraz

Carneiro³

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to estimate the phenotypic diversity in Jafarabadi, Murrah, and Mediterranean buffalo cows (Bubalus bubalis). Thoracic perimeter, withers-and-rump height, body length, and biiliac, external biischiatic, external ilioischiatic, sacropubic, and mean biiliac diameters were measured. The following indexes were calculated: anamorphosis index, pelvic index, withers-to-rump ratio, body index, lateral-body index, relative body index, body capacity indexes 1 and 2, transversal pelvic index, longitudinal pelvic index, and thoracic-perimeter-to-withers ratio index. The effect of breed was evaluated using univariate (mean tests) and multivariate (size-free discriminant analysis and Fisher's linear discriminant function) analyses. The diversity among the breeds and their correlation with the variables were also evaluated using biplot graphs developed from principal component analysis. The breeds evaluated show a rectilinear, midline body model with similar capacity of muscular tissue development in body parts from which the most valuable cuts are extracted, and intermediate suitability for meat and milk production. The Jafarabadi breed has a larger body size, with a rear portion wider than longer, while the Murrah and Mediterranean breeds show similar biotypes, mainly differentiated in the pelvic region.Index terms: Bubalus bubalis, biometric measurements, pelvimetry, zootechnical indexes. Diversidade fenotípica em búfalas Jafarabadi, Murrah e MediterrâneoResumo -O objetivo deste trabalho foi estimar a diversidade fenotípica em búfalas (Bubalus bubalis) das raças Jafarabadi, Murrah e Mediterrâneo. Mensuraram-se perímetro torácico, altura de anterior e de garupa, comprimento do corpo e diâmetros do biilíaco, biisquiático externo, ilioisquiático externo, sacropúbico e biilíaco médio. Calcularam-se os seguintes índices: de anamorfose, pélvico, relação cernelha-garupa, corporal, corporal-lateral, corporal relativo, capacidade corporal 1 e 2, pélvico transversal, pélvico longitudinal e relação perímetro torácico-cernelha. Avaliou-se o efeito de raça por meio das análises univariada (teste de médias) e multivariada (análise discriminante independente do tamanho e função discriminante linear de Fisher). Também avaliaram-se a diversidade entre as raças e a sua relação com as variáveis, por meio de gráficos biplot, elaborados a partir da análise de componentes principais. As raças apresentam modelo corpóreo retilíneo, mediolíneo e com capacidade igual para desenvolvimento de tecido muscular em locais de onde são extraídos cortes nobres, com aptidões intermediárias para produção de carne e leite. A raça Jafarabadi apresenta maior porte corporal, assim como uma porção traseira mais larga do que comprida, enquanto a Murrah e a Mediterrâneo apresentam biótipos próximos, diferenciados principalmente na região pélvica.Termos para indexação: Bubalus bubalis, medidas biométricas, pelvimetria, índices zootécnicos.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Phenotypic diversity in buffalo cows of the Jafarabadi, Murrah, and Mediterranean breeds

Rezende

Ferraz

Carneiro³

et al. 2017

Pesq. agropec. bras.

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“…Thus all the estimates were of moderate magnitude they were similar to those reported in previous studies. Koury Filho et al (2010) reported heritability estimates for CONF, PREC and MUSC evaluated in yearling beef cattle of 0.24, 0.32 and 0.27, respectively. Estimates of heritability of 0.26 for PREC and MUSC traits analyzed under a multi-trait linear threshold Bayesian approach were reported by Santana Jr et al (2013).…”

Section: Resultsmentioning

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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“…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%

“…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%

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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Estimativas de parâmetros genéticos para os escores visuais e suas associações com peso corporal em bovinos de corte

Cited by 51 publications

References 16 publications

Phenotypic diversity in buffalo cows of the Jafarabadi, Murrah, and Mediterranean breeds

Phenotypic diversity in buffalo cows of the Jafarabadi, Murrah, and Mediterranean breeds

Categorical Visual Score Traits of a Nellore Beef Cattle Population

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

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