Relevance of the variability of kidding day in Creole goats in Guadeloupe |
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| Authors: | N Mandonnet G Alexandre M Navès |
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| Institution: | a Institut National de la Recherche Agronomique (INRA), Unité de Recherches Zootechniques, Domaine Duclos, 97170 Petit-Bourg, Guadeloupe (French West Indies)
b INRA, Unité expérimentale de Gardel, 97129 Le Moule, Guadeloupe (French West Indies) |
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| Abstract: | The results of 5732 records of kids born between 1985 and 1996 at Gardel Agricultural Experiment Station (INRA) in Guadeloupe, were used in order to estimate the effect of kidding day (KD) on individual preweaning growth performances, total productivity of Creole goats and litter size. The flock was subjected to a restricted mating season for a long time, by using male effect. The results of the fixed linear model showed a highly significant (P<0.001) effect of KD on growth rate and total productivity of does. Live weights of kids born around the 21st day of the kidding period (KP) was 4% to 7% higher than those of kids born the first day of the KP. For total productivity of does, this ratio did not reached more than 4%. The optimum at 70 days of age occurred around 14th day of the KD with 3% of improvement of total productivity. No effect was observed upon litter size. The genetic (co)variance components were estimated by six different Individual Animal Models. The heritability (h2) estimated from the best model, was hD2=0.25±0.05 for genetic direct effect; hM2=0.09±0.04 for genetic maternal effect and the genetic correlation between direct and maternal effects was −0.86±0.12. The use of KD could be highly recommended in a breeding program in this population of Creole meat goats, since it is quite easy to record under commercial conditions as a character related to reproductive performance. |
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| Keywords: | Creole goats Kidding day Preweaning growth Productivity Variance components |
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