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

Author(s)

Oliveira, Elisa Junqueira ^[1] ; Savegnago, Rodrigo Pelicioni ^[2] ; de Freitas, Luara Afonso ^[2] ; Freitaso, Anielly Paula ^[1] ; Maia, Suellen Rodrigues ^[3] ; Simili, Flavia Fernanda ^[3] ; El Faro, Lenira ^[3] ; Dias da Costa, Ricardo Lopes ^[4] ; Santana Junior, Mario Luiz ^[5] ; Paro de Raz, Claudia Cristina ^[3]

Affiliation

^[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Genet, Ave Bandeirantes 3-900, BR-14049900 Ribeirao Preto, SP - Brazil

^[2] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Dept Ciencias Exatas, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP - Brazil

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

^[4] Ctr Pesquisa Zootecnia Diversificada, Inst Zootecnia, Rua Heitor Penteado 56, BR-13460000 Nova Odessa, SP - Brazil

^[5] Univ Fed Mato Grosso, Inst Ciencias Agr & Tecnol, Rodovia Rondonopolis Guiratinga, Km 06, BR-78735901 Rondonopolis, MT - Brazil

• Document type: Journal article
• Source: Pesquisa Agropecuária Brasileira; v. 53, n. 12, p. 1338-1345, DEC 2018.
• Web of Science Citations: 0

Abstract

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. (AU)

• FAPESP's process: 16/10583-1 - Genetic evaluation of growth characteristics and resistance to worms in sheep breed Santa Inês using random regression models and cluster analysis
• Grantee: Luara Afonso de Freitas Januário
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 13/20091-0 - Prediction of breeding values in a experimental mice population using selective genotyping
• Grantee: Rodrigo Pelicioni Savegnago
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 12/15982-0 - Selection criteria for economic importance traits in Santa Inês sheep
• Grantee: Claudia Cristina Paro de Paz
• Support Opportunities: Regular Research Grants