Maternal effect or growth curve of Santa Inês sheep by random regression models

  • José Lindenberg Rocha Sarmento Universidade Federal do Piauí, Brasil
  • Robledo de Almeida Torres Universidade Federal de Viçosa
  • Wandrick Hauus de Sousa EMPA-PB
  • Raimundo Nonato Braga Lôbo EMBRAPA Caprinos
  • José Ernandes Rufino de Sousa UFPI
  • Aderbal Cavalcante Neto Departamento de Zootecnia, UNESP, Jaboticabal, Brasil
  • Alan Oliveira do Ó UFPI
Keywords: heritability, animal model, hair sheep, Legendre polynomial

Abstract

Data set of 17.767 weight records of 4.210 Santa Inês lambs were used aiming to evaluate the importance of the inclusion of the maternal effect in the model to estimate components of (Co) variance and resulting genetic parameters for the growth curve through random regression models. The fixed and random regressions were fitted using Legendre Polynomials of order three, being fit four models that differed in relation to the inclusion of the additive genetic and permanent environmental maternal effects. Considerable increase was observed in Log L and decrease in the criteria AIC and BIC when the maternal effect was included (genetic or permanent environmental), evidencing its importance. The maternal genetic effect explained larger proportion of the phenotypic variance than the maternal permanent environmental along the growth curve. The direct additive genetic variance was inflated by maternal effect, when this last one was not considered in the analysis model, reflecting the same behavior in the heritabilities. The maternal permanent environmental effect contributed to maternal variance, as well as, it inflated maternal genetic variance, when it was not considered in the model. Similar behavior was verified with maternal heritability. The correlation estimated for the four models hardly differed in function of maternal effect. The maternal effect should be considered in the genetic studies of the growth curve of Santa Inês sheep.

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Author Biographies

José Lindenberg Rocha Sarmento, Universidade Federal do Piauí, Brasil

Campus de Bom Jesus/UFPI

Genética e Melhoramento Animal

Bolsista do CNPq

Robledo de Almeida Torres, Universidade Federal de Viçosa

Bolsista do CNPq

Wandrick Hauus de Sousa, EMPA-PB

Bolsista do CNPq

Raimundo Nonato Braga Lôbo, EMBRAPA Caprinos

Bolsista do CNPq

Alan Oliveira do Ó, UFPI

Bolsista do CNPq

Published
31-08-2011
How to Cite
Sarmento, J. L. R., Torres, R. de A., Sousa, W. H. de, Lôbo, R. N. B., Sousa, J. E. R. de, Neto, A. C., & Ó, A. O. do. (2011). Maternal effect or growth curve of Santa Inês sheep by random regression models. Comunicata Scientiae, 2(2), 113-121. https://doi.org/10.14295/cs.v2i2.28
Section
Original Article