Genetic parameters for body weight and morphometric traits in Santa Ines sheep using Bayesian inference

Autor(es)

Oliveira, Elisa Junqueira ^[1] ; Savegnago, Rodrigo Pelicioni ^[2] ; Freitas, Anielly de Paula ^[1] ; de Freitas, Luara Afonso ^[1] ; de Paz, Ana Carolina Almeida Rollo ^[3] ; El Faro, Lenira ^[3] ; Simili, Flavia Fernanda ^[3] ; Vercesi Filho, Anibal Eugenio ^[4] ; da Costa, Ricardo Lopes Dias ^[4] ; de Paz, Claudia Cristina Paro ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Genet, Ave Bandeirantes 3900, BR-14049900 Ribeirao Preto, SP - Brazil

^[2] Michigan State Univ, Dept Anim Sci, E Lansing, MI 48864 - USA

^[3] Ctr Avancado Pesquisa Bovinos Corte, Inst Zootecnia, Rodovia Carlos Tonani, Km 94, BR-14174000 Sertaozinho, SP - Brazil

^[4] Ctr Pesquisa & Desenvolvimento Zootecnia Diversif, Inst Zootecnia, BR-13460000 Nova Odessa, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Small Ruminant Research; v. 201, AUG 2021.
• Citações Web of Science: 0

Resumo

The objective of this study was to estimate genetic parameters between body weight and morphometric traits to choose selection criteria to improve genetically the body weight and body conformation using Bayesian inference. Body weight, body length, chest girth, croup height, croup width, withers height, and body condition score of 645 Santa Ines meat sheep were used to estimate the genetic parameters in a multi-trait animal model with Bayesian approach. The heritability estimates ranged from 0.19 +/- 0.05 to 0.32 +/- 0.07 (croup width and body condition score respectively), which allow them to respond to genetic selection. The genetic correlations between body weight and morphometric traits were positive and ranged from 0.18 +/- 0.17 to 0.98 +/- 0.02. The genetic correlation between body weight and chest girth (0.98 +/- 0.02) indicates that selection based on one trait will result in genetic gain for the other. The body weight is the main selection criterion to increase the meat production via genetic selection of the animals due to its moderate heritability and moderate to high genetic correlation with the other traits studied. However, if calibrated electronic scales are not available for the sheep producers, they can use the morphometric measurements to carry out the selection of animals to result in indirect genetic gains for body weight. If the breeders want to choose only one morphometric trait to indirectly improve the genetic body weight, chest girth is recommended due to its extremely high genetic correlation with body weight. The next step would be to develop an index that takes into account all the morphometric measurements to use it as indirect indicator of body weight. (AU)

• Processo FAPESP: 18/01540-2 - Predição dos valores genômicos utilizando modelos Bayesianos e de redes neurais para características de resistência a endoparasitas em ovinos Santa Inês
• Beneficiário: Luara Afonso de Freitas Januário
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/15982-0 - Critérios de seleção para características de importância econômica em ovinos da raça Santa Inês
• Beneficiário: Claudia Cristina Paro de Paz
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/14522-7 - Estudos genômicos associados às características de resistência a endoparasitas em ovinos Santa Inês
• Beneficiário: Claudia Cristina Paro de Paz
• Modalidade de apoio: Auxílio à Pesquisa - Temático