Associação genética de escores de conformação com características de crescimento em bovinos da raça Angus

Everling, Dionéia Magda; Rorato, Paulo Roberto Nogara; Araújo, Ronyere Olegário de; Boligon, Arione Augusti; Bresolin, Tiago; Dornelles, Mariana de Almeida; Weber, Tomás; Pacheco, Paulo Santana; Campos, Leonardo Talavera

doi:10.1590/s0100-204x2012001000016

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…A study on the genetic association between visual scores showed that the selection for conformity for yearlings (amount of meat as measured by length, body depth, and muscle development) affected characteristics of average daily weight gain or speed of weight gain at weaning and over a year of age (EVERLING et al, 2012).…”

Section: Variable ---------------2014-----------------------------201mentioning

confidence: 99%

Phenotypic and genotypic characteristics on calves’ sale price on the western border of the state of Rio Grande do Sul, Brazil

et al. 2018

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The demand for beef cattle with specific traits is evident from sales in auctions. While purchasing, buyers consider individual traits (e.g., muscularity, frame, racial composition, and weight) as predictors of quality, and adjust their bids according to their preferences. The present study aimed to evaluate the effect of phenotypic and racial characteristics in determining the final sale price of calves of beef cattle in official auctions at the western border of the state of Rio Grande do Sul, Brazil. Five-hundred and seven lots of calves sold in calf auctions from five cities on the western border of Rio Grande do Sul were evaluated. The assignment of visual scores was based on their genetic group, frame, muscularity, and coat. Analysis of variance and the Tukey test at 5% significance level were performed for comparing the final average prices. Variables with the greatest impact on price were the genetic group and the size of the animals. Animals of synthetic breeds obtained higher value in the three years studied and animals without racial definition showed considerable devaluation and a decrease in supply. Larger animals had less value.

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Section: Variable ---------------2014-----------------------------201mentioning

confidence: 99%

Phenotypic and genotypic characteristics on calves’ sale price on the western border of the state of Rio Grande do Sul, Brazil

et al. 2018

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Economic efficiency of Rhipicephalus microplus control and effect on beef cattle performance in the Brazilian Cerrado

Calvano

Brumatti²,

Garcia

et al. 2019

Exp Appl Acarol

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The cattle tick Rhipicephalus microplus causes significant economic losses to cattle production systems and is a main barrier to the introduction of Bos taurus breeds and their crosses in Brazil. These breeds have the genetic potential to generate animals that are more productive, but they are also more susceptible to R. microplus. One of the alternatives for conventional tick control is the use of strategic control, aiming at delaying or even preventing the development of its resistance to acaricides. The present study aimed to evaluate the economic losses caused by tick infestation on the productive performance of two breeds of beef cattle and to evaluate the economic efficiency of tick strategic control and its impacts on beef cattle production systems. Animal weights were obtained from the literature and were used to calculate the weight loss in kilograms (kg) and the economic loss (US$) caused by R. microplus infestation. The cost/loss ratio of performing strategic control was also calculated. The data show that tick infestation causes economic losses to the breeds and groups of animals evaluated and reduces animal performance (weight loss). The results show a loss of US$34.61/animal in the backgrounding phase and US$7.97/animal in the finishing phase for Brangus animals and its crosses. In conclusion, the data show that strategic control is economically efficient for Brangus animals in the backgrounding phase, independent of the methods used for acaricide application.

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Threshold and linear models for genetic evaluation of visual scores in Hereford and Braford cattle

et al. 2019

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Data from 127539 Hereford and Braford cattle were used to compare estimates of genetic parameters for navel, conformation, precocity, muscling and size visual scores at yearling, using linear and threshold animal models. In a second step, these models were cross-validated using a multinomial logistic regression in order to quantify the association between phenotype and genetic merit for each trait. For navel score, higher heritability was obtained with the threshold model (0.42 ± 0.02) in relation to the linear model (0.22 ± 0.02). However, similar heritability was estimated in both models for conformation, precocity, muscling and size, with values of 0.18 ± 0.01, 0.19 ± 0.01, 0.19 ± 0.01 and 0.26 ± 0.01, respectively, using linear model, and of 0.19 ± 0.01, 0.19 ± 0.01, 0.20 ± 0.01, and 0.29 ± 0.01, respectively, using threshold model. For navel score, Spearman correlations between sires’ breeding values predicted using linear and threshold models ranged from 0.60 (1% of the best sires are selected) to 0.96 (all sires are selected). For conformation, precocity, muscling and size scores, low changes in sires’ rank are expected using these models (Spearman correlations >0.86), regardless of the proportion of sires selected. Except for navel with the linear model, the direction of the associations between phenotype and genetic merit were in accordance with its expectation, as there were increases in the phenotype per unit of change in the breeding value. Thus, the threshold model would be recommended to perform genetic evaluation of navel score in this population. However, linear and threshold models showed similar predictive ability for conformation, precocity, muscling and size scores.

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Associação genética de escores de conformação com características de crescimento em bovinos da raça Angus

Cited by 4 publications

References 12 publications

Phenotypic and genotypic characteristics on calves’ sale price on the western border of the state of Rio Grande do Sul, Brazil

Phenotypic and genotypic characteristics on calves’ sale price on the western border of the state of Rio Grande do Sul, Brazil

Economic efficiency of Rhipicephalus microplus control and effect on beef cattle performance in the Brazilian Cerrado

Threshold and linear models for genetic evaluation of visual scores in Hereford and Braford cattle

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