首页> 外文期刊>Canadian Journal of Animal Science >Estimation of genetic and phenotypic parameters for ultrasound and carcass merit traits in crossbred beef cattle.
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Estimation of genetic and phenotypic parameters for ultrasound and carcass merit traits in crossbred beef cattle.

机译:遗传和表型参数的估计和杂交肉牛的cas体功绩性状。

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摘要

Ultrasound measurements of 852 crossbred steers along with carcass merit measurements on 756 of them were used to examine their genetic and phenotypic parameters. Traits, including ultrasound backfat thickness (UBF), ultrasound ribeye area (UREA), ultrasound marbling (UMAR), carcass weight (CWT), carcass grade fat (CGF), carcass average backfat thickness (CABF), carcass ribeye area (CREA), carcass marbling score (CMAR) and carcass lean meat yield (CLMY), were measured during 6 years of residual feed intake trials from 2003 to 2008. Pairwise bivariate animal models were performed for each combination of traits using ASReml software to estimate heritability, phenotypic and genetic correlations among the traits. Significant fixed effects (contemporary group and sire breed), covariates (age of dam, slaughter weight and start test age of animal), and random additive effects were fitted in the models. The heritability estimates for UBF, UREA, UMAR, CWT, CGF, CABF, CREA, CMAR and CLMY were 0.31, 0.17, 0.37, 0.40, 0.22, 0.25, 0.24, 0.38 and 0.28, respectively. Most of the phenotypic correlations were significant (P<0.05). CWT had low to moderate phenotypic correlations with most of the traits. Results showed that heavier CWT tended to have more UREA, CGF, CABF and CREA. Genetic correlations among these traits varied from weak to strong, but most of them were not significantly different from zero. Greater CREA may lead to decreased UMAR and UBF due to negative genetic correlations (-0.56 +or- 0.32 and -0.45 +or- 0.23, respectively). The results supported the potential value of ultrasound technology in crossbred beef cattle breeding programs to generate indicator traits for carcass quality. In addition, carcass lean meat yield correlated favourably with backfat thickness and rib eye area but correlated unfavourably with UMAR. The estimated genetic parameters for ultrasound and carcass merit traits can be incorporated into breeding programs that emphasize carcass quality in Canadian crossbred beef cattle populations.
机译:超声测量了852头杂交ste牛,以及其中756头的cas体优值,以检查其遗传和表型参数。特性包括超声背f厚度(UBF),超声肋眼面积(UREA),超声大理石花纹(UMAR)、,体重量(CWT),c​​ar体脂肪(CGF)、,体平均背average厚度(CABF),car体肋眼面积(CREA)在2003年至2008年的6年剩余采食量试验中,对体大理石花纹得分(CMAR)和car体瘦肉产量(CLMY)进行了测量。使用ASReml软件对每种性状组合进行成对的双变量动物模型,以评估遗传力,表型性状之间的遗传相关性。在模型中拟合了显着的固定效应(当代群体和父系品种),协变量(水坝年龄,屠宰体重和动物的开始试验年龄)以及随机加性效应。 UBF,UREA,UMAR,CWT,CGF,CABF,CREA,CMAR和CLMY的遗传力估计分别为0.31、0.17、0.37、0.40、0.22、0.25、0.24、0.38和0.28。大多数表型相关性是显着的(P <0.05)。 CWT与大多数性状之间的表型相关性较低或中等。结果表明,较重的CWT倾向于具有更多的UREA,CGF,CABF和CREA。这些性状之间的遗传相关性从弱到强不等,但大多数不从零显着不同。由于负的遗传相关性(分别为-0.56 +或-0.32和-0.45 +或-0.23),较高的CREA可能导致UMAR和UBF降低。结果支持超声技术在杂交肉牛育种计划中的潜在价值,以产生car体质量指标特征。此外,car体瘦肉产量与后脂肪厚度和肋眼面积呈正相关,而与UMAR呈不利关系。可以将超声和ultrasound体优点性状的估计遗传参数纳入强调加拿大杂交肉牛种群population体质量的育种计划中。

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