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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Estimates of genetic parameters and genetic trends for reproductive traits and weaning weight in Tabapua cattle

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Bernardes, P. A. [1] ; Grossi, D. A. [1] ; Savegnago, R. P. [1] ; Buzanskas, M. E. [1] ; Urbinati, I. [1] ; Bezerra, L. A. F. [2] ; Lobo, R. B. [3] ; Munari, D. P. [1]
Total Authors: 8
[1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Dept Ciencias Exatas, Jaboticabal, SP - Brazil
[2] Univ Sao Paulo, FMRP, Dept Genet, Ribeirao Preto, SP - Brazil
[3] ANCP Natl Breeders & Researchers Assoc, Ribeirao Preto, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF ANIMAL SCIENCE; v. 93, n. 11, p. 5175-5185, NOV 2015.
Web of Science Citations: 7

The Tabapua breed is a beef cattle Brazilian breed known for its sexual precocity and desirable characteristics for tropical conditions. However, this is a newly formed breed and few studies have been conducted regarding genetic parameters and genetic trends for its reproductive traits. The objective of the present study was to estimate the genetic parameters, genetic trends, and relative selection efficiency for weaning weight adjusted to 210 d of age (W210), age at first calving (AFC), average calving interval (ACI), first calving interval (CI1), and accumulated productivity (ACP) among Tabapua beef cattle. Pedigree data on 15,241 Tabapua animals born between 1958 and 2011 and phenotype records from 7,340 cows born between 1970 and 2011 were supplied by the National Association of Breeders and Researchers (Associacao Nacional de Criadores e Pesquisadores). Analysis through the least squares method assisted in defining the fixed effects that were considered within the models. The estimates for the genetic parameters were obtained through the REML, using a multitrait animal model. The likelihood ratio test applied for W210 was significant (P < 0.05) for the inclusion of maternal additive genetic and permanent environmental effects in the model. Genetic trends were calculated through linear regression of the EBV of the animals, according to the year of birth. The heritability estimates obtained ranged from 0.04 +/- 0.03 for CI1 to 0.25 +/- 0.05 for W210. The genetic correlations ranged from 0.004 +/- 0.19 for W210-AFC and 0.93 +/- 0.12 for ACI-CI1. The genetic trend was significant (P < 0.05) and favorable for CI1 and the maternal genetic effect of W210 and was significant (P < 0.05) and unfavorable for AFC, ACI, and ACP. The ACP could be used in the selection index to assist the breeding goal of improved productive and reproductive performance. The genetic trends indicated small and unfavorable genetic changes for AFC, ACI, and ACP in light of the recent implementation of a genetic breeding program for this breed. (AU)

FAPESP's process: 13/09050-0 - Selection signatures in Canchim beef cattle
Grantee:Ismael Urbinati
Support type: Scholarships in Brazil - Master
FAPESP's process: 13/09364-5 - Estimates of population and genetic parameters and genetic trends for economically important traits in Tabapuã cattle
Grantee:Priscila Arrigucci Bernardes
Support type: 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 type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/19335-2 - Study of admixture level in Canchim breed and ma genetic group animals using high density single nucleotide polymorphism markers
Grantee:Marcos Eli Buzanskas
Support type: Scholarships in Brazil - Post-Doctorate