TY  - JOUR
T1  - Alternative Models of Genetic Evaluation of Reproductive Traits for Local Goat Population
under Arid Conditions
AU - Atoui, A. AU - Carabaño, M.J. AU - Abdennebi, M. AU - Najari, S. 
JO  - Journal of Animal and Veterinary Advances
VL  - 20
IS  - 7
SP  - 169
EP  - 173
PY  - 2021
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2021.169.173
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2021.169.173
KW  - Bi-variate model
KW  -uni-variate model
KW  -evaluation
KW  -improvement program
KW  -Local goat
KW  -reproduction
AB  - The success of small ruminant breeding
programs depends on appropriate models for genetic
evaluation of traits showing a genetic association between
reproductive phenotypes. The study aims to determine the
environmental and genetic components that synthesize the
reproductive performance of local goats in arid
conditions, in order to make the foundations for future
genetic improvement of this population. Two reproductif
traits were studied: the interval between kidding and the
litter size at birth. Three models were used for each case,
univariate and bivariate analyzes which differ in random
effects included in the model, only the additive genetic
effects, only the permanent environmental effects or both
effects simultaneously. The obtained results suggest that
the Bi-variate model including only the permanent
environmental effects of the goat is the most adequate to
model the reproductive performance of local goat. Direct
genetic variances are mainly higher using the uni-variate
model than the Bivariate model. The environmental
variance estimates obtained are the same for both models.
The heritabilities recorded from the uni-variate model are
slightly lower than the estimates from the Bi-variate
model. It seems imperative to consider in animal model,
all the genetic and environmental effects, that intervene
on the determinism of reproductif traits.
ER  -