Estimativas de componentes de (co)variância para peso e escores visuais de conformação frigorífica em bovinos Nelore

Wenceslau, Raphael Rocha; Felipe, V.P.S.; Valente, Bruno D.; Rosa, A. P. S. A. da; Nobre, P. R. C.; Nieto, Leonardo Martín; Silva, M. A

doi:10.1590/s0102-09352012000200026

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…Wenceslau et al (2012) em bovinos da raça Nelore. Tendo em vista que os animais do presente estudo foram mantidos em regime de criação a pasto, esse valor pode ser considerado satisfatório.…”

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Desempenho e escores visuais em bovinos ao sobre ano da raça Nelore

Taveira¹,

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Amaral³

et al. 2016

Pubvet

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Objetivou-se avaliar escore visual de 100 novilhos da raça Nelore ao sobre ano. O estudo foi conduzido em propriedade rural localizada no município de Goianésia, estado de Goiás. O método de avaliação visual utilizado foi o CPMUT (Conformação, Precocidade, Musculosidade, Umbigo e Temperamento). O peso médio ao sobre ano encontrado foi de 317,6 kg. As estimativas das correlações simples do peso ao sobre ano com as características de conformação, precocidade, musculosidade foram positiva e variaram de média a alta magnitude. As avaliações visuais de bovinos da raça Nelore ao sobre ano constituem-se em importante ferramenta auxiliar no processo de avaliação e seleção dos animais.

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Desempenho e escores visuais em bovinos ao sobre ano da raça Nelore

Taveira¹,

Neto

Amaral³

et al. 2016

Pubvet

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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%

“…Barichello et al (2010) also reported moderate (0.61) and low (0.17) genetic correlation estimates between slaughter conformation scores and live weight and scrotal circumference at weaning, respectively, in Canchim animals. Recently, Wenceslau et al (2012), working with Nellore cattle, obtained positive and moderate to high genetic correlation estimates that ranged from 0.61 to 0.81 between growth traits (weight at weaning and yearling) and slaughter conformation scores at weaning and yearling. The results obtained in the present study suggest that selection to increase yearling weight would improve carcass conformation and composition.…”

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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“…For the assessmet of Slick Hair mutation, carcass traits were collected by ultrasonography measurements in the Longissimus dorsi muscle between the 12 th and 13 th ribs: ribeye area in squared centimeters (REA), backfat thickness in millimeters (BF) and intramuscular fat expressed in percentage (IMF). In addition, in relation to carcass the score carcass conformation (SCC) described by Wenceslau et al (2012), as a visual assessment in scores of (1 -6) for precocity, muscularity, and structure was used. As growth trait was assessed weight (YW) expressed in kilograms (kg), and as precocity trait the scrotal circumference (SC) in centimeters (cm).…”

Section: Slick Hair Analysismentioning

confidence: 99%

“…and intramuscular fat expressed in percentage (IMF). In addition, in relation to carcass the score carcass conformation (SCC) described by Wenceslau et al (2012) as a visual assessment in scores of (1 -6) for precocity, muscularity, and structure was used. As growth trait was assessed weight (YW) expressed in kilograms (kg), and as precocity trait the scrotal circumference (SC) in centimeters (cm).…”

Section: Traitsmentioning

confidence: 99%

Genetic effects of double muscle and slick hair mutations on selection criteria and genomic study for water efficiency in senepol cattle

Souza

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Concerns about climate change, water resources, and scarcity encourage new research and solutions in all industry sectors, and the livestock is no exception. The possibility of practicing genetic selection to reduce the water footprint of beef may be a viable alternative. However, the inclusion of new traits in breeding programs requires a prior study of their impact on already established traits such as weight gain. Thus, the aim of this study was to describe the genetic parameters of water efficiency measures and conduct a Genome-Wide Association Study (GWAS), as well as Post-GWAS, to assess the effect of Double Muscle (DM) and Slick Hair mutations on selection criteria. Data were provided by the Brazilian Association of Senepol Cattle Breeders - ABCB Senepol and the Embrapa Geneplus Program. It was observed that individuals carrying Slick Hair and not carrying DM are the most recommended. Heritability averages were found for water efficiency measures, and the phenotypic correlation values between weight gain and residual water intake were null. In addition, showed a genetic association of medium to high magnitude with residual feed intake, making them more attractive for selection. This is different from gross measurements that demonstrate a medium to high genetic association with weight gain. Water intake and dry matter intake demonstrated high genetic association (0.85). Only for water conversion ratio were significant SNPs found, reinforcing the polygenic nature of these traits. Enrichment analyses revealed that various biological processes are involved in the expression of this phenotype. In general, there is genetic variability for water efficiency selection; these traits demonstrate a polygenic nature, and several biological processes linked to saliva production, heat stress, water transport, imune sistem, lipid metabolism and oxidoreductase activity are involved with phenotype. Keywords: Adapted Taurine. Genetic Parameters. Genome Wide Association Study. Post-GWAS.

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Estimativas de componentes de (co)variância para peso e escores visuais de conformação frigorífica em bovinos Nelore

Cited by 5 publications

References 10 publications

Desempenho e escores visuais em bovinos ao sobre ano da raça Nelore

Desempenho e escores visuais em bovinos ao sobre ano da raça Nelore

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

Genetic effects of double muscle and slick hair mutations on selection criteria and genomic study for water efficiency in senepol cattle

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