Genetic parameters for growth and carcass traits of Brahman steers1,2

Smith, Timothy P. L.; Domingue, J. D.; Paschal, Joe C.; Franke, D. E.; Bidner, T. D.; Whipple, G.

doi:10.2527/jas.2006-653

Cited by 59 publications

(74 citation statements)

References 34 publications

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“…Hump height (HMP) was measured as a component of the MSA system, as an indicator of the B. indicus content of carcasses. The trait was more heritable in BRAH than TCOMP (h 2 = 0.21 and 0.06, respectively), though the estimate for BRAH was lower than those presented in the literature, where Smith et al (2007) and Riley et al (2003) reported heritabilities of 0.38 and 0.52, respectively.…”

Section: Genetic and Phenotypic Variances And Heritabilities For Carccontrasting

confidence: 40%

“…Table 5 presents the additive and phenotypic variances and heritabilities for carcass and meat quality traits in BRAH and TCOMP steers. Several studies (O'Connor et al 1997;Elzo et al 1998;Newman et al 2002;Johnston et al 2003b;Reverter et al 2003a;Riley et al 2003;Domingue 2005;Smith et al 2007) have examined the genetic parameters of meat quality and carcass traits in tropically adapted beef cattle. Generally, levels of phenotypic variation and heritabilities in this study were consistent with those presented by Johnston et al (2003b) and Reverter et al (2003b) from previous studies conducted by the Beef CRC in Australia.…”

Section: Genotype Differencesmentioning

confidence: 99%

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Genetics of meat quality and carcass traits and the impact of tenderstretching in two tropical beef genotypes

et al. 2009

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Abstract. Meat quality and carcass traits were measured for 2180 feedlot finished Brahman (BRAH) and Tropical Composite (TCOMP) steers to investigate genetic and non-genetic influences on shear force, and other meat quality traits. Genetic and phenotypic correlations were estimated between carcass and meat quality traits, and with live animal measurements collected in steers from weaning to feedlot exit, and their heifer half-sibs up to their first mating, which were managed in Australia's tropical or subtropical environments. Left sides of carcasses were tenderstretched (hung by the aitch-bone) while right sides were conventionally hung (by the Achilles tendon). Tenderstretching reduced mean shear force by 1.04 kg, and phenotypic variance by 77% of that observed in conventionally hung sides. Genotype differences existed for carcass traits, with TCOMP carcasses significantly heavier, fatter, with greater eye muscle area, and lower retail beef yield than BRAH. TCOMP had lower shear force, and higher percent intramuscular fat. Meat quality and carcass traits were moderately heritable, with estimates for shear force and compression of 0.33 and 0.19 for BRAH and 0.32 and 0.20 for TCOMP respectively. In both genotypes, estimates of heritability for carcass traits (carcass weight, P8 and rib fat depths, eye muscle area and retail beef yield) were consistently moderate to high (0.21 to 0.56). Shear force and compression were genetically correlated with percent intramuscular fat (r g = -0.26 and -0.57, respectively), and meat colour (r g = -0.41 and -0.68, respectively). For TCOMP, lower shear force was genetically related to decreased carcass P8 fat depth (r g = 0.51). For BRAH steers and heifers measured at pasture, fatness traits and growth rates were genetically correlated with shear force, although the magnitude of these relationships varied with time of measurement. Net feed intake was significantly genetically correlated with carcass rib fat depth (r g = 0.49), eye muscle area (r g = -0.42) and retail beef yield (r g = -0.61). These results demonstrate that selection to improve production and carcass traits can impact meat quality traits in tropically adapted cattle, and that genotype specific evaluations will be necessary to accommodate different genetic relationships between meat quality, carcass and live animal traits.

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Section: Genetic and Phenotypic Variances And Heritabilities For Carccontrasting

confidence: 40%

Section: Genotype Differencesmentioning

confidence: 99%

Genetics of meat quality and carcass traits and the impact of tenderstretching in two tropical beef genotypes

et al. 2009

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“…Detailed management procedures were given by Smith et al (2007). Briefly, calves were castrated, vaccinated for appropriate diseases, dewormed, dehorned if necessary, and backgrounded through autumn until ryegrass (Lolium multiflorum) could be grazed in early winter each year.…”

Section: Methodsmentioning

confidence: 99%

“…Riley et al (2003) reported low heritability estimates (0.14 to 0.06) for shear force measurements after 7, 14 and 21 days of loin steaks from Brahman steers and heifers fed in Florida. Smith et al (2007) reported slightly higher heritability estimates (0.29 ± 0.14 and 0.20 ± 0.11, respectively) for shear force measured on loin steaks aged 7-and 14-day postmortem from Brahman steers fed and processed in south Texas. Relatively low heritability estimates and the time required to obtain shear force data to establish meaningful sire expected progeny differences for shear force suggest that other methods for determining the genetic merit for tenderness should be identified.…”

Section: Introductionmentioning

confidence: 99%

Single nucleotide polymorphisms in Brahman steers and their association with carcass and tenderness traits

Smith¹,

Thomas²,

Bidner³

et al. 2009

Genet. Mol. Res.

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ABSTrACT. Data from purebred Brahman steers (N = 467) were used to study the association of single nucleotide polymorphisms (SNP) with carcass traits and measures of tenderness. Fall weaned calves were grazed and fed in a subtropical environment and then harvested for processing in a commercial facility. Carcass data were recorded 24 h postmortem. Muscle samples and primal ribs were obtained to measure calpastatin activity and shear force. DNA was used to determine genotypes of thyroglobulin (TG5), calpastatin (CAST) and μ-calpain (CAPN 316 and CAPN 4751) SNP. Minor allele frequencies for CAST, CAPN 316 and CAPN 4751 were 0.342, 0.031, and 0.051, respectively. CAST genotypes were associated with calpastatin enzyme activity (P < 0.01) and shear force of steaks aged for 14-day postmortem (P < 0.05). CAPN 316 genotypes were also associated with variation in shear force of steaks aged for 14 days (P < 0.05). CAPN 4751 genotypes approached significance for association with shear force of steaks after 7 and 14 days (P < 0.08). Genotypes for TG5 were non-polymorphic (i.e., minor allele frequency = 0.004) and omitted from further analyses. Neither CAST nor CAPN SNP was associated with variation in other carcass traits.

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“…Kilpatrick and Steen (1999) reported that the estimates of (co)variance components will lead to the establishment of carcass correlation curves over time and the development of a predictive model. In many published articles, covariances between growth and carcass traits at specific (discrete) ages are provided (Bergen et al, 2006a,b;Smith et al, 2007), and essential information regarding the estimation of covariances between longitudinal growth data and carcass quality traits is often lacking.…”

Section: Introductionmentioning

confidence: 99%

Joint analysis of beef growth and carcass quality traits through calculation of co-variance components and correlations

Verbyla¹,

Pitchford²

2011

Genet. Mol. Res.

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ABSTRACT.A joint growth-carcass model using random regression was used to estimate the (co)variance components of beef cattle body weights and carcass quality traits and correlations between them. During a four-year period (1994)(1995)(1996)(1997) of the Australian "southern crossbreeding project", mature Hereford cows (N = 581) were mated to 97 sires of Jersey, Wagyu, Angus, Hereford, South Devon, Limousin, and Belgian Blue breeds, resulting in 1141 calves. Data included 13 (for steers) and 8 (for heifers) body weight measurements approximately every 50 days from birth until slaughter and four carcass quality traits: hot standard carcass weight, rump fat depth, rib eye muscle area, and intramuscular fat content. The mixed model included fixed effects of sex, sire breed, age (linear, quadratic and cubic), and their interactions between sex and sire breed with age. Random effects were sire, dam, management (birth location, year, post-weaning groups), and permanent environmental effects, and their interactions with linear, quadratic and cubic growth, when possible. Phenotypic, sire and dam correlations between body weights and hot standard carcass weight and rib eye muscle area were positive and moderate to high from birth to feedlot period. Management variation accounted for the largest proportion of total variation in both growth and carcass traits. Management correlations between carcass traits were high, except between rump fat depth and intramuscular fat (r = 0.26). Management correlations between body weight and carcass traits during the pre-weaning period were positive except for intramuscular fat. The correlations were low from birth to weaning, then increased dramatically and were high during the feedlot period.

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Genetic parameters for growth and carcass traits of Brahman steers1,2

Cited by 59 publications

References 34 publications

Genetics of meat quality and carcass traits and the impact of tenderstretching in two tropical beef genotypes

Genetics of meat quality and carcass traits and the impact of tenderstretching in two tropical beef genotypes

Single nucleotide polymorphisms in Brahman steers and their association with carcass and tenderness traits

Joint analysis of beef growth and carcass quality traits through calculation of co-variance components and correlations

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