Heritabilities and Genetic, Environmental and Phenotypic Correlations of Carcass Traits in a Population of Diverse Biological Types and their Implications in Selection Programs

Koch, R. M.; Cundiff, L. V.; Gregory, K. E.

doi:10.2527/jas1982.5561319x

Cited by 108 publications

(158 citation statements)

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“…Genetic correlations between WBSF and carcass traits (BF and LMA) were also observed by Koch, Cundiff and Gregory (1982) who obtained a value of -0.01 for the genetic correlation between WBSF and BF, and a value of -0.02 between WBSF and LMA. Although these genetic correlations were negative, opposite to those obtained in this study, they were also of a very low magnitude, indicating that the selection for WBSF should not influence the selection for the mentioned carcass traits.…”

Section: T a B L E 5 -mentioning

confidence: 79%

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

Castro¹,

Magnabosco²,

Sainz³

et al. 2014

Rev. Ciênc. Agron.

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-The aim of the present study was to analyze the interrelationships among the variables and also estimate the genetic correlations between tenderness (WBSF), growth (ILW, FLW and ADG) and carcass (BF, RF and LMA) features. Other purpose was to identify individuals who were more likely to be carriers of favorable genes for tenderness. Growth, carcass and tenderness data from 415 Polled Nellore animals was analyzed. Factor analysis and canonical correlations were used to analyze the phenotypic relationships. The covariance components and genetic parameters were estimated using Gibbs Sampling method. Lack of phenotypical correlations between the WBSF and the other traits were observed. The genetic correlations between WBSF and the other evaluated traits were of a low magnitude, with values of -0.15; -0.18; -0.13; 0.10; -0.12 and 0.18, between WBSF and ILW, FLW, ADG, BF, RF and LMA, respectively. The results support the conclusion that tenderness selection will not affect the selection of other economic traits and vice-versa, but for a better knowledge of the genetic relationships between meat tenderness and other traits for Polled Nellore more studies are required. The heritability estimated for WBSF was of a low magnitude (0.11 ± 0.022). Based on the principle of probability of identical genes by ancestry individuals who were more likely to be carriers of favorable genes for tenderness were identified. Further work will include creation of a segregating population that will serve as experimental material for future gene prospecting and identification research.Key works: Carcass. Shear force. Pedigree.RESUMO -Objetivou-se analisar os inter-relacionamentos entre as variáveis, além de estimar as correlações genéticas entre os grupos de características de maciez (FC), crescimento (PI, PF e GPD) e carcaça (EG, P8 e AOL). Foi proposto também, identificar indivíduos que apresentem alta probabilidade de serem portadores de genes favoráveis à maciez. Analisouse dados de 415 animais Nelore Mocho, filhos de touros representativos das principais linhagens Nelore, avaliados para características de crescimento, carcaça e maciez. Para análises de relacionamentos fenotípicos foram utilizadas análises de fatores e correlações canônicas. Os componentes de variância necessários à obtenção dos parâmetros genéticos foram estimados pelo método da Amostragem de Gibbs. Observou-se ausência de correlações fenotípicas entre FC e as outras características produtivas. As correlações genéticas entre FC e PI, PF, GPD, EG, P8 e AOL foram de baixa magnitude (-0,15; -0,18; -0,13; 0,10; -0,12 e 0,18). A seleção para a maciez não influenciará na seleção de outras características de interesse econômico e vice-versa, porém serão necessários mais estudos para melhor conhecimento sobre as relações genéticas da maciez e outras características produtivas em bovinos Nelore Mocho. A estimativa de herdabilidade para a característica FC foi de baixa magnitude (0,11 ± 0,022). Baseando-se no princípio da probabilidade de genes idênticos por descendê...

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Section: T a B L E 5 -mentioning

confidence: 79%

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

Castro¹,

Magnabosco²,

Sainz³

et al. 2014

Rev. Ciênc. Agron.

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“…Cattle of high Bos indicus content had lower marbling scores at a given age and produced less tender and more variable steaks than Bos taurus breeds (Koch et al 1982;Crouse et al 1989;DeRouen et al 1992;Van Vleck et al 1992;Wheeler et al 1994;Barkhouse et al 1996.) Some early breed comparison studies have been criticised on the basis of failure to control processing factors that may lead to cold shortening, which results in tougher meat, particularly in leaner and lighter breeds.…”

Section: Objective Measures Of Beef Tenderness Warner Bratzler Initiamentioning

confidence: 99%

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

Burrow¹,

Moore²,

Johnston³

et al. 2001

Aust. J. Exp. Agric.

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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.

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“…Breed cross values have been reported in the literature for birth and weaning traits (Smith et al 1976a), postweaning growth and feed conversion (Smith et al 1976b), carcass and meat traits (Koch et al 1976), postweaning growth and puberty characteristics of heifers (Laster et al 1976) and reproductive and growth performances of F, cows and their progeny (Notter et al 1978a,b;Young et al 1978 Comerford et al (1987). Growth traits ofthe purebred and crossbred progeny were reported by Comerford et al (1988a) and carcass traits by Comerford et al (1988b Koch et al (1982), MacNeil et al (1984) and woodward (1990). rh2 isrhe heritability, ,u is the assumed mean, op is the phenotypic standard deviation and CV is the coefficient of variation.…”

Section: Breeds and Traitsmentioning

confidence: 99%

Genetic differences among the predominant beef cattle breeds in Canada: An analysis of published results

Amer¹,

Kemp²,

Smith³

1992

Can. J. Anim. Sci.

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Heritabilities and Genetic, Environmental and Phenotypic Correlations of Carcass Traits in a Population of Diverse Biological Types and their Implications in Selection Programs

Cited by 108 publications

References 10 publications

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

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

Genetic differences among the predominant beef cattle breeds in Canada: An analysis of published results

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