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Genetic evaluation of growth characteristics and resistance to worms in sheep breed Santa Inês using random regression models and cluster analysis

Grant number: 16/10583-1
Support type:Scholarships in Brazil - Master
Effective date (Start): July 01, 2016
Effective date (End): February 28, 2018
Field of knowledge:Agronomical Sciences - Animal Husbandry - Genetics and Improvement of Domestic Animals
Principal researcher:Danísio Prado Munari
Grantee:Luara Afonso de Freitas Januário
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
Associated scholarship(s):17/13320-4 - Genetic evaluation of growth traits and resistance to verminoses in Santa Inês sheep using random regression models and cluster analysis, BE.EP.MS

Abstract

The body weight is one of the mainly traits evaluated in sheep selection and it provides a more accurate measure of carcass yield, and can be measured in the same animal at different ages. In addition, as well as traits related to the production, the selection should also include resistance and resilience to endoparasites traits, because sheep have a greater susceptibility to infections caused by endoparasites, which considerably limits the performance and economic efficiency of these animals. The aims of this study were: (1) compare structures to mold the residual variance in random regression models; (2) evaluate the influence of this modeling in the estimation of genetic parameters in order to determine the most appropriate model to study the growth curve and resistance to worms; (3) use cluster analysis to explore the genetic profile of the animals for meat production, resistance and resilience to endoparasites, in order to identify superior animals and use them as sires and dams of Santa Ines sheep. To perform the analysis, it will be used a data set with records from 2,531 from 771 sheep Santa Ines. The traits analyzed will be: body weight (BW), fecal egg counting per gram (FEC) and packed cell volume (PCV). The analysis of the estimates of the variance components will be carried out using a single trait random regression model by the restricted maximum likelihood method in order to determine the best model to study the growth curve and resistance to worms. Based on breeding values of the additives studied traits, cluster analysis by the hierarchical and non-hierarchical methods will be performed, in order to characterize the groups that will be subject to selection.

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FREITAS, L. A.; SAVEGNAGO, R. P.; OLIVEIRA, E. J.; PAZ, C. C. P.; MUNARI, D. P. Inheritance, genetic correlation and cluster analyses of fecal egg count, packed cell volume and body weight in different ages using random regression model in Santa Ines sheep. Small Ruminant Research, v. 174, p. 57-61, MAY 2019. Web of Science Citations: 0.
HEVERTON LUIS MOREIRA; RODRIGO PELICIONI SAVEGNAGO; LUARA AFONSO DE FREITAS; RAYSILDO BARBOSA LÔBO; LUIZ ANTONIO FRAMARTINO BEZERRA; CLAUDIA CRISTINA PARO DE PAZ. Breeding goals and economic values for Nellore cattle in a full-cycle production system. Acta Sci., Anim. Sci., v. 41, p. -, 2019.
OLIVEIRA, ELISA JUNQUEIRA; SAVEGNAGO, RODRIGO PELICIONI; DE FREITAS, LUARA AFONSO; FREITASO, ANIELLY PAULA; MAIA, SUELLEN RODRIGUES; SIMILI, FLAVIA FERNANDA; EL FARO, LENIRA; DIAS DA COSTA, RICARDO LOPES; SANTANA JUNIOR, MARIO LUIZ; PARO DE RAZ, CLAUDIA CRISTINA. Estimates of genetic parameters and cluster analysis for worm resistance and resilience in Santa Ines meat sheep. Pesquisa Agropecuária Brasileira, v. 53, n. 12, p. 1338-1345, DEC 2018. Web of Science Citations: 0.
DE FREITAS, LUARA AFONSO; SAVEGNAGO, RODRIGO PELICIONI; GRUPIONI, NATALIA VINHAL; RAMOS, SALVADOR BOCCALETTI; STAFUZZA, NEDENIA BONVINO; PEREIRA DE FIGUEIREDO, ELSIO ANTONIO; SCHMIDT, GILBERTO SILBER; LEDUR, MONICA CORREA; MUNARI, DANISIO PRADO. Reduced-rank estimation of genetic parameters for egg production traits and cluster analyses with predicted breeding values. ACTA AGRICULTURAE SCANDINAVICA SECTION A-ANIMAL SCIENCE, v. 68, n. 2, p. 81-86, APR 3 2018. Web of Science Citations: 0.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
JANUÁRIO, Luara Afonso de Freitas. Avaliação genética de crescimento e resistência a verminoses em ovinos Santa Inês utilizando modelos de regressão aleatória e análises multivariadas. 2018. Master's Dissertation - Universidade Estadual Paulista "Júlio de Mesquita Filho" Faculdade de Ciências Agrárias e Veterinárias..

Please report errors in scientific publications list by writing to: cdi@fapesp.br.