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Genetic parameters for stayability in Murrah buffaloes

Published online by Cambridge University Press:  12 April 2010

Priscilla M Galeazzi
Affiliation:
São Paulo State University – Animal Science Department – Jaboticabal-SP, Brazil
Maria EZ Mercadante
Affiliation:
Animal Science Experimental Station of Sertãozinho-SP, Brazil
Josineudson AIIV Silva
Affiliation:
São Paulo State University – Animal Breeding and Nutrition Department – Botucatu-SP, Brazil
Rúsbel R Aspilcueta-Borquis
Affiliation:
São Paulo State University – Animal Science Department – Jaboticabal-SP, Brazil
Gregório MF de Camargo
Affiliation:
São Paulo State University – Animal Science Department – Jaboticabal-SP, Brazil
Humberto Tonhati*
Affiliation:
São Paulo State University – Animal Science Department – Jaboticabal-SP, Brazil
*
*For correspondence; e-mail: tonhati@fcav.unesp.br

Abstract

In order to contribute to the breeding programmes of Asian water buffalo, the aim of this study was to analyse the influence of genetic effects in the stayability of Murrah dairy buffaloes. The stayability trait (ST) was defined as the female's ability to stay in the herd for one (ST1), two (ST2), three (ST3), four (ST4), five (ST5) or six years (ST6) after the first calving. The same trait was also considered as continuous and was designated stayability in days up to one (STD1), two (STD2), three (STD3), four (STD4), five (STD5) or six years (STD6) after the first calving. Data from 1016 females reared in nine herds located in the State of São Paulo, Brazil, were analysed. Statistical models included the additive genetic effect of the animal and the fixed effects of the buffalo breeding herd, birth year and birth season. Additive effects for ST were estimated by approximate restricted maximum likelihood using a threshold model, while for STD, the additive effects were estimated by restricted maximum likelihood. Heritability estimates were lower for ST, except for ST1, (0·11±0·07, 0·17±0·06, 0·23±0·06, 0·16±0·08, 0·14±0·09 and 0·16±0·10 for ST1, ST2, ST3, ST4, ST5 and ST6, respectively) when compared with STD (0·05±0·06, 0·18±0·08, 0·40±0·10, 0·49±0·11, 0·41±0·11 and 0·30±0·13, for STD1, STD2, STD3, STD4, STD5 and STD6, respectively). Considering the values of heritability and owing to the serial nature of STD to a specific age, selection for STD3 should have a favourable influence on STD to other ages.

Type
Research Article
Copyright
Copyright © Proprietors of Journal of Dairy Research 2010

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