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Genetic relations between the number of calving before 53 months, rebreeding subsequent of primiparous, ability to stay and scrotal circumference in Nelore cattle

Grant number: 11/16066-5
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2012
Effective date (End): November 30, 2013
Field of knowledge:Agronomical Sciences - Animal Husbandry - Genetics and Improvement of Domestic Animals
Principal Investigator:Sandra Aidar de Queiroz
Grantee:Aline Rocha Guarini
Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
Associated scholarship(s):12/09790-1 - Genetic relations between the number of calving before 53 months, rebreeding subsequent of primiparous, ability to stay and scrotal circumference in Nelore cattle, BE.EP.MS


The reproductive efficiency of the herd presents considerable improvements by identifying and multiplying the genotypes most appropriate to the production system and also the environmental conditions conducive to expression of these genes. Identify reproductive characteristics with easy measure, economically importance with potential selective is essential. Herds with high fertility and sexual precocity have a greater availability of animals, whether for sale or for selection, allowing more intense selective and, consequently, higher genetic progress. This study aims to estimate heritability for the traits number of calvings before 53 months, redesign of primiparous stayability up to 72 months, scrotal circumference (SC), to establish correlations between genetic and phenotypic and calvings before 53 months and the other features, seeking the possibility of using the features directly measured in females as selection criteria for genetic improvement in Nelore cattle. It is intended to estimate the (co) variance and genetic parameters for the characteristics mentioned by Bayesian inference, using the software THRGIBBS1F90 (Misztal et al., 2002). Calvings before 53 months, rebreeding subsequent of primiparous and stayability will be analyzed assuming a threshold model, which relates the observed response (in discrete scale) to an underlying normal scale, while the characteristic SC will be analyzed under a linear model, including the effects age and weight as covariates. (AU)

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Scientific publications
(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)
DE REZENDE NEVES, HAROLDO HENRIQUE; DOS REIS, FELIPE POLIN; PATERNO, FLAVIA MOTTA; GUARINI, ALINE ROCHA; CARVALHEIRO, ROBERTO; DA SILVA, LILIAN REGINA; DE OLIVEIRA, JOAO ADEMIR; DE QUEIROZ, SANDRA AIDAR. Herd-of-origin effect on the post-weaning performance of centrally tested Nellore beef cattle. TROPICAL ANIMAL HEALTH AND PRODUCTION, v. 46, n. 7, p. 1235-1241, . (10/06185-4, 11/16066-5)
GUARINI, A. R.; NEVES, H. H. R.; SCHENKEL, F. S.; CARVALHEIRO, R.; OLIVEIRA, J. A.; QUEIROZ, S. A.. Genetic relationship among reproductive traits in Nellore cattle. ANIMAL, v. 9, n. 5, p. 760-765, . (11/16066-5)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
GUARINI, Aline Rocha. Genetic relationship between reproductive traits in Nellore cattle. 2013. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.

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