Estimates of genetic parameters and cluster analysis for worm resistance and resilience in Santa Inês meat sheep

Authors

  • Elisa Junqueira Oliveira Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Genética, Avenida Bandeirantes, no 3.900, Monte Alegre, CEP 14049-900 Ribeirão Preto, SP.
  • Rodrigo Pelicioni Savegnago Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Ciências Exatas, Via de Acesso Prof. Paulo Donato Castellane, s/no, CEP 14884-900 Jaboticabal, SP.
  • Luara Afonso de Freitas Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Departamento de Ciências Exatas, Via de Acesso Prof. Paulo Donato Castellane, s/no, CEP 14884-900 Jaboticabal, SP.
  • Anielly Paula Freitas Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Genética, Avenida Bandeirantes, no 3.900, Monte Alegre, CEP 14049-900 Ribeirão Preto, SP.
  • Suellen Rodrigues Maia Instituto de Zootecnia, Centro Avançado de Pesquisa de Bovinos de Corte, Rodovia Carlos Tonani, Km 94, CEP 14174-000 Sertãozinho, SP.
  • Flávia Fernanda Simili Instituto de Zootecnia, Centro Avançado de Pesquisa de Bovinos de Corte, Rodovia Carlos Tonani, Km 94, CEP 14174-000 Sertãozinho, SP.
  • Lenira El Faro Instituto de Zootecnia, Centro Avançado de Pesquisa de Bovinos de Corte, Rodovia Carlos Tonani, Km 94, CEP 14174-000 Sertãozinho, SP.
  • Ricardo Lopes Dias da Costa Instituto de Zootecnia, Centro de Pesquisa em Zootecnia Diversificada, Rua Heitor Penteado, no 56, Centro, CEP 13460-000 Nova Odessa, SP.
  • Mário Luiz Santana Júnior Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rodovia Rondonópolis-Guiratinga, Km 06, CEP 78735-901 Rondonópolis, MT.
  • Claudia Cristina Paro de Paz Instituto de Zootecnia, Centro Avançado de Pesquisa de Bovinos de Corte, Rodovia Carlos Tonani, Km 94, CEP 14174-000 Sertãozinho, SP.

DOI:

https://doi.org/10.1590/S1678-3921.pab2018.v53.26422

Keywords:

cluster analysis, Famacha, genetic correlation, heritability, k-means, multivariate analysis

Abstract

The objective of this work was to estimate genetic parameters for traits related to resistance to endoparasites in Santa Inês sheep, for a possible inclusion in sheep breeding programs, as well as to evaluate the additive genetic pattern of the animals using cluster analyzes, in order to assess whether there are groups within the population that can be used as candidates for selection for resistance to endoparasites. The studied traits were: Famacha score, fecal egg counts (FEC), packed cell volume (PCV), total plasma protein (TPP), body condition score (BCS), and body weight (BW). Heritability estimates ranged from 0.17 (0.05) for TPP to 0.31 (0.07) for BCS. The cluster analyzes based on the breeding values identified four clusters. Famacha and BCS can be recommended as selection criteria for resistance to hematophagous endoparasites because they can respond to selection and are easy to be measured. Animals from cluster 1 have great potential as candidates for selection because of their additive genetic pattern, taking into account body weight and endoparasite resistance due to higher breeding values for BW, BCS, PCV, and TPP and lower breeding values for Famacha and FEC.

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Published

2018-12-28

How to Cite

Oliveira, E. J., Savegnago, R. P., Freitas, L. A. de, Freitas, A. P., Maia, S. R., Simili, F. F., … Paz, C. C. P. de. (2018). Estimates of genetic parameters and cluster analysis for worm resistance and resilience in Santa Inês meat sheep. Pesquisa Agropecuaria Brasileira, 53(12), 1338–1345. https://doi.org/10.1590/S1678-3921.pab2018.v53.26422

Issue

v.53, n.12, dez. 2018

Section

GENETICS