Genetic parameter estimates for carcass and yearling ultrasound measurements in Brangus cattle.

Moser, Daniel W.; Bertrand, J. K.; Misztal, I.; Kriese, L A; Benyshek, L. L.

doi:10.2527/1998.76102542x

Cited by 76 publications

(87 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For TEMP, the scan traits were both phenotypically and genetically positively correlated with LWT. Arnold et al (1991), Robinson et al (1993), and Moser et al (1998) have reported similar results. No genetic estimates for scanned fatness traits were obtained for TROP due to failed convergence because little phenotypic variation existed for these traits at POSTW (e.g.…”

Section: Post-weaningsupporting

confidence: 71%

“…Johnson et al (1993) reported a -0.53 genetic correlation between yearling ultrasound fatness and weight in tropically adapted Brangus cattle. In contrast, Moser et al (1998), also working with Brangus, estimated a positive 0.11 genetic correlation between scan rib fat and yearling weight. The discrepancy in the correlation estimates between the studies may be due to the very low additive variances of the fatness traits as a result of the leanest of the cattle (<5 mm) at the time of scanning.…”

Section: Start Of Finishingmentioning

confidence: 99%

See 1 more Smart Citation

Genetic and phenotypic characterisation of animal, carcass, and meat quality traits from temperate and tropically adapted beef breeds.

Johnston¹,

Reverter²,

Burrow³

et al. 2003

Aust. J. Agric. Res.

View full text Add to dashboard Cite

Abstract. A total of 7622 cattle were measured for several weight and body composition traits in temperate and tropically adapted breeds. Traits included: liveweight, hip height, body fat score, muscle score, flight time, ultrasound scanned fatness, and eye muscle area. Measurements were taken at 3 stages during the project: post-weaning, start of finishing, and end of finishing (i.e. pre-slaughter). Animals were finished to 3 target market-weight end-points (220, 280, or 340 kg carcass weight), either on pasture or in a feedlot, and in 2 different geographic regions for tropically adapted breeds. These data were used to estimate genetic parameters for the traits at each stage, and also to estimate the effect of market weight and finishing regimes on the phenotypic and genetic expression of each trait measured at the end of finishing stage. Results showed, for all traits, that the magnitude of the phenotypic expression increased across the stages and market-weight end-points for the end of finishing measures. Feedlot finishing decreased the age at slaughter, and increased fatness and muscling compared with pasture-finished animals. Heritabilities ranged from 0.13 to 0.58, with subjectively scored traits generally being lower than objectively measured traits. Additive genetic variances generally increased with stage of measurement, and with increasing market weight. Genetic correlations of the same measure across stages or market weights were all close to unity. Additive genetic variances of the various traits were similar for feedlot versus pasture finish groups, and the genetic correlation between each measure for feedlot and pasture finish was generally greater than 0.80. The effect of finishing geographic region (i.e. temperate versus subtropical environments) for the tropically adapted breeds had little effect on the size of the additive genetic variances or genetic correlations between traits across geographic regions.The results imply that changing the production system had a significant impact on the phenotypic expression of growth and body composition traits but little effect on the underlying genetic expression and subsequent ranking of sires (i.e. no evidence of genotype by production environment interactions). Therefore, these live animal measures could be used as selection criteria in genetic evaluation programs and may also be genetically correlated with abattoir carcass and meat quality traits.

show abstract

Section: Post-weaningsupporting

confidence: 71%

Section: Start Of Finishingmentioning

confidence: 99%

Genetic and phenotypic characterisation of animal, carcass, and meat quality traits from temperate and tropically adapted beef breeds.

Johnston¹,

Reverter²,

Burrow³

et al. 2003

Aust. J. Agric. Res.

View full text Add to dashboard Cite

show abstract

“…Além disso, pelo fato de a AOL ter correlação alta com o peso (Moser et al, 1998;Stelzleni et al, 2002), esperava-se que os machos apresentassem maior AOL. Yokoo et al (2007) também observaram maior AOL em machos do que em fêmeas para a raça Nelore.…”

Section: Methodsunclassified

Efeitos de ambiente e estimativas de parâmetros genéticos para características de carcaça em bovinos da raça Canchim criados em pastagem

Meirelles

Alencar

Oliveira³

et al. 2010

R. Bras. Zootec.

View full text Add to dashboard Cite

RESUMO -Os objetivos neste trabalho foram estudar os efeitos de ambiente sobre a espessura de gordura subcutânea (EGS), a área de olho-de-lombo (AOL) e o peso aos 19 meses de idade e estimar parâmetros genéticos para essas características.Utilizaram-se informações obtidas de 987 bovinos da raça Canchim (5/8 Charolês + 3/8 Zebu) e do grupo genético animal MA foram estimados pelo método da máxima verossimilhança restrita utilizando-se um modelo animal com efeitos fixos (ano de nascimento, grupo genético, rebanho e sexo) e os efeitos aleatórios genético aditivo direto e residual. As médias de área de olho-de-lombo e peso foram mais altas nos machos que nas fêmeas. No grupo genético MA, as médias para todas as características foram mais altas que na raça Canchim e houve ainda efeitos de rebanho e de ano de nascimento. As estimativas de herdabilidade para AOL (0,33 ± 0,09), EGS (0,24 ± 0,09) e peso (0,23 ± 0,09) foram moderadas, enquanto que a estimativa de correlação genética (0,21 ± 0,24) entre EGS e AOL foi baixa, o que sugere que essas características são controladas por diferentes conjuntos de genes de ação aditiva. As correlações genéticas para peso estimadas com EGS (0,57 ± 0,23) e com AOL (0,62 ± 0,16) foram moderadas. Conclui-se que as características ao sobreano devem responder à seleção nos rebanhos estudados e que a seleção para aumento de peso também eleva EGS e AOL e vice-versa.Palavras-chave: área de olho-de-lombo, correlação genética, espessura de gordura, herdabilidade, peso Environmental effects and genetic parameters estimates for carcass traits inCanchim cattle raised on pastures ABSTRACT -The objective in this work was to study the effects of environmental factors on subcutaneous fat thickness (BFT), loin eye area (REA) and body weight (BW) measured at 19 months of age and to estimate genetic parametersfor these traits. It was used information obtained from 987 Canchim (5/8 Charolais + 3/8 Zebu) and MA genetic group (offspring of Charolais bulls and 1/2 Canchim + 1/2 Zebu cows) bulls and heifers, born in 2003, 2004, and 2005. Covariance components were estimate by restricted likelihood method using animal model with fixed effects (year of birth, genetic group, herd, and sex) and residual and direct additive genetic random effects. Means of loin eye area and weight were higher for males than for females. In the MA genetic group, the means, for all traits, were higher than in the Canchim group, and there were still the effects of herd and year of birth. The heritability estimates of REA (0.33 ± 0.09), BFT (0.24 ± 0.09) and BW (0.23 ± 0.09) were moderate, while genetic correlation estimate (0.21 ± 0.24) between BFT and REA was low, suggesting that traits are controlled by different sets of genes with additive action. Genetic correlations of BW with BFT (0.57 ± 0.23) and REA (0.62 ± 0.16) are moderate. It is possible to conclude that those traits can respond for selection and they indicate that selection for BW will increase also enhance BFT and REA and vice versa. IntroduçãoPara manter-se como maio...

show abstract

“…However, genetic evaluation for these attributes in breeding animals is generally difficult and expensive. Use of real-time ultrasound scanning for eye muscle area and fat thickness as a predictor of saleable beef yield is an effective tool for genetic evaluation of carcass quantity in young animals (Perkins et al 1992;Robinson et al 1993;Bergen et al 1996;Moser et al 1998). Ultrasonography is also potentially useful for genetic evaluation of intramuscular fat (marbling) in young animals, particularly in heifers or steer half-sibs (Wilson et al 1998).…”

Section: Genetic Markers For Carcass and Beef Quality Attributesmentioning

confidence: 99%

Quantitative and molecular genetic influences on properties of beef: a review

Burrow¹,

Moore²,

Johnston³

et al. 2001

Aust. J. Exp. Agric.

View full text Add to dashboard Cite

Abstract. The scientific literature is reviewed to identify quantitative and molecular genetic influences on quantity and quality of beef. Genetic variation between breeds is of similar magnitude to genetic variation within breeds for many economically important traits. Differences between breeds are significant and large for most carcass and beef quality attributes, including beef tenderness, although differences for sensory juiciness and flavour are of little practical importance. For traits such as beef tenderness, between-breed differences may be more easily exploited than within-breed differences, because exceptional breeds are easier to identify than exceptional animals. Effects of heterosis on carcass and beef quality attributes are relatively small (3% or less), with most effects mediated through heterotic effects on weight. Carcass composition traits (e.g. carcass weight, fat thickness and marbling) are moderately to highly heritable. Most estimates of retail beef yield percentage are highly heritable, offering good potential for within-breed selection for the trait, although a moderate to strong antagonistic relationship exists between yield and marbling. This relationship needs to be considered in within-breed selection programs for yield percentage. Early estimates of heritability of objective measures of beef tenderness (Warner Bratzler shear force values) indicated tenderness was moderately to highly heritable. Recent estimates using larger numbers of carcasses and more discriminatory methods of analysis indicate that beef tenderness is lowly heritable in Bos taurus breeds and moderately heritable in Bos indicus and Bos indicus-derived breeds. Within breeds, measures of 24-h calpastatin activity are genetically strongly correlated with shear force values but are more heritable. However, phenotypic correlations between shear force values and 24-h calpastatin activities are low. There are also inconsistencies in relationships between these measurements across breeds. Low correlations between tenderness in different muscles, low to moderate heritabilities and inconsistent variation within-and between-breeds for traits such as 24-h calpastatin activity suggest that genetic improvement in beef tenderness may be difficult. The possibility exists that significant mitochondrial genetic effects occur for some carcass and beef quality attributes. A major gene for muscular hypertrophy in cattle significantly affects carcass and beef quality characteristics. Genome-wide screening of DNA markers indicates a number of putative Quantitative Trait Loci (QTL) associated with carcass and meat quality characteristics. Published data for these QTL are summarised. Strategies to combine quantitative and molecular genetic information to maximise genetic progress are discussed.

show abstract

Genetic parameter estimates for carcass and yearling ultrasound measurements in Brangus cattle.

Cited by 76 publications

References 18 publications

Genetic and phenotypic characterisation of animal, carcass, and meat quality traits from temperate and tropically adapted beef breeds.

Genetic and phenotypic characterisation of animal, carcass, and meat quality traits from temperate and tropically adapted beef breeds.

Efeitos de ambiente e estimativas de parâmetros genéticos para características de carcaça em bovinos da raça Canchim criados em pastagem

Quantitative and molecular genetic influences on properties of beef: a review

Contact Info

Product

Resources

About