Genetic correlations between categorical morphological traits in Nelore cattle by applying Bayesian analysis under a threshold animal model

Faria, Carina Ubirajara de; Pires, Bruno Carlos; Vozzi, A. P.; Magnabosco, C. de U.; Filho, W. Koury; Viu, M. A. O.; Oliveira, Henrique Nunes de; Lôbo, Raysildo Barbosa

doi:10.1111/j.1439-0388.2010.00860.x

Cited by 24 publications

(19 citation statements)

References 20 publications

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“…This implies that the positioning of the navel, prepuce, and sheath, on average, are suitable for animals at pasture (Josahkian et al 2003). E and P had mean scores of 4.19 and 3.87, respectively, in line with those described by Faria et al (2010) The initial weight on test was 232.93 kg with a mean age of 330.20 days (Table 2) and weight corrected for 365 days was 257.48 kg, higher than found by Malhado et al (2010) who obtained 229.16 kg at 365 days with Nelore animals reared at pasture in Northern Brazil and close to that seen by Yokoo et al (2010), which was adjusted for 365 days to 250.39 kg. Average final weight adjusted for 550 days was 354.71 kg, close to that described by Yokoo et al (2010) with 347.14 kg and by Koury Filho et al (2009) who reported 330.91 kg with a mean age of 523.10 days.…”

Section: Resultssupporting

confidence: 85%

Genetic parameters for type classification of Nelore cattle on central performance tests at pasture in Brazil

Lima

Paiva

Cobuci

et al. 2013

Trop Anim Health Prod

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The objective of this study was to characterize Nelore cattle on central performance tests in pasture, ranked by the visual classification method EPMURAS (structure, precocity, muscle, navel, breed, posture, and sexual characteristics), and to estimate genetic and phenotypic correlations between these parameters, including visual as well as production traits (initial and final weight on test, weight gain, and weight corrected for 550 days). The information used in the study was obtained on 21,032 Nelore bulls which were participants in the central performance test at pasture of the Brazilian Association for Zebu Breeders (ABCZ). Heritabilities obtained were from 0.19 to 0.50. Phenotypic correlations were positive from 0.70 to 0.97 between the weight traits, from 0.65 to 0.74 between visual characteristics, and from 0.29 to 0.47 between visual characteristics and weight traits. The genetic correlations were positive ranging from 0.80 to 0.98 between the characteristics of structure, precocity and musculature, from 0.13 to 0.64 between the growth characteristics, and from 0.41 to 0.97 between visual scores and weight gains. Heritability and genetic correlations indicate that the use of visual scores, along with the selection for growth characteristics, can bring positive results in selection of beef cattle for rearing on pasture.

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Section: Resultssupporting

confidence: 85%

Genetic parameters for type classification of Nelore cattle on central performance tests at pasture in Brazil

Lima

Paiva

Cobuci

et al. 2013

Trop Anim Health Prod

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“…In Ireland,McHugh et al (2012) estimated that heritability of the muscularity traits varied from 0.27 for loin development and thigh width to 0.32 for hind quarter development, width at withers and development of inner thigh. The heritabilities estimated in the present study are similar to those reported in the literature for animals of the Nellore breed(Yokoo et al 2009;Faria et al 2010). Using a sample from the same data set, Boligon et al(2011) estimated heritabilities of 0.24 AE 0.02, 0.31 AE 0.02 and 0.32 AE 0.02 for conformation, finishing and muscling scores obtained at yearling, respectively.…”

supporting

confidence: 87%

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

Boligon

Ayres

Pereira

et al. 2012

J Animal Breeding Genetics

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Records of Nellore animals born from 1990 to 2006 were used to estimate genetic correlations of visual scores at yearling (conformation, C; finishing precocity, P; and muscling, M) with primiparous subsequent rebreeding (SR) and days to first calving (DC), because the magnitude of these associations is still unknown. Genetic parameters were estimated by multiple-traits Bayesian analysis, using a nonlinear (threshold) animal models for visual scores and SR and a linear animal models for weaning weight (WW) and DC. WW was included in the analysis to account for the effects of sequential selection. The posterior means of heritabilities estimated for C, P, M, SR and DC were 0.24 ± 0.01, 0.31 ± 0.01, 0.30 ± 0.01, 0.18 ± 0.02 and 0.06 ± 0.02, respectively. The posterior means of genetic correlations estimated between SR and visual scores were low and positive, with values of 0.09 ± 0.02 (C), 0.19 ± 0.03 (P) and 0.18 ± 0.05 (M). On the other hand, negative genetic correlations were found between DC and C (-0.11 ± 0.09), P (-0.19 ± 0.09) and M (-0.16 ± 0.09). The primiparous rebreeding trait has genetic variability in Nellore cattle. The genetic correlations between visual scores, and SR and DC were low and favourable. The genetic changes in C, P and M were 0.02, 0.03 and 0.03/year, respectively. For SR and DC, genetic trends were 0.01/year and -0.01 days/year, respectively, indicating that the increase in genetic merit for reproductive traits was small over time. Direct selection for visual scores together with female reproductive traits is recommended to increase the fertility of beef cows.

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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%

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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Genetic correlations between categorical morphological traits in Nelore cattle by applying Bayesian analysis under a threshold animal model

Cited by 24 publications

References 20 publications

Genetic parameters for type classification of Nelore cattle on central performance tests at pasture in Brazil

Genetic parameters for type classification of Nelore cattle on central performance tests at pasture in Brazil

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

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

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