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 Opportunities: Scholarships in Brazil - Master
• Start date: July 01, 2016
• End date: February 28, 2018
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Genetics and Improvement of Domestic Animals
• Principal Investigator: Danísio Prado Munari
• Grantee: Luara Afonso de Freitas Januário
• Host 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.

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)

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. Estimativas de parâmetros genéticos e análise de agrupamento para resistência e resiliência à verminose em ovinos de corte Santa Inês. Pesquisa Agropecuária Brasileira, v. 53, n. 12, p. 1338-1345, DEC 2018. (16/10583-1, 13/20091-0, 12/15982-0)

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, 2019-02-25. (16/10583-1, 13/20091-0)

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. (16/10583-1, 12/15982-0)

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. (12/16087-5, 16/10583-1, 13/20091-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

JANUÁRIO, Luara Afonso de Freitas. Genetic evaluation of growth and resistance to gastrointestinal nematode parasites in Santa Ines sheep using random regression models and multivariate analyzes. 2018. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.