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Genetic parameters of traits associated with the growth curve in Segureña sheep

Published online by Cambridge University Press:  23 December 2015

T. M. Lupi ,
J. M. León ,
S. Nogales ,
C. Barba  and
J. V. Delgado
T. M. Lupi*
Affiliation:
Scientific Technical Unit of Natural Resources and Sustainable Development, Escola Superior Agrária, Instituto Politécnico de Castelo Branco, 6001-909 Castelo Branco, Portugal
J. M. León
Affiliation:
Centro Agropecuario Diputación de Córdoba, 14071-Córdoba, Spain
S. Nogales
Affiliation:
Departamento de Genética, Universidad de Córdoba, Campus Universitario de Rabanales, 14071 Córdoba, Spain
C. Barba
Affiliation:
Departamento de Producción Animal, Universidad de Córdoba, Campus Universitario de Rabanales, 14071 Córdoba, Spain
J. V. Delgado
Affiliation:
Departamento de Genética, Universidad de Córdoba, Campus Universitario de Rabanales, 14071 Córdoba, Spain
*
†E-mail: [email protected]
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Abstract

This paper studies the genetic importance of growth curve parameters and their relevance as selection criteria in breeding programmes of Segureño sheep. Logistic and Verhulst growth functions were chosen for their best fit to BW/age in this breed; the first showed the best general fit and the second the best individual fit. Live weights of 41 330 individuals from the historical archives of the National Association of Segureña Sheep Breeders were used in the analysis. The progeny of 1464 rams and 27 048 ewes were used to study the genetic and phenotypic parameters of growth curve parameters and derived traits. Reproductive management in the population consists in controlled natural mating inside every herd, with a minimum of 15% of the females fertilized by artificial insemination with fresh semen; with the purpose being the herd genetic connections, all herd genealogies are screened with DNA markers. Estimates of growth curve parameters from birth to 80 days were obtained for each individual and each function by the non-linear regression procedure using IBM SPSS statistics (version 21) with the Levenberg–Marquart estimation method. (Co)variance components and genetic parameters were estimated by using the REML/Animal model methodology. The heritability of mature weight was estimated as 0.41±0.042 and 0.38±0.021 with the logistic and Verhulst models, respectively, and the heritability of other parameters ranged from 0.41 to 0.62 and 0.37 to 0.61, with the models, respectively. A negative genetic correlation between mature weight and rate of maturing was found.

Keywords

logistic modelVerhulst modelheritabilitylambsSegureña breed
Type
Research Article
Information
animal , Volume 10 , Supplement 5 , May 2016 , pp. 729 - 735
Copyright
© The Animal Consortium 2015 

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