2005, Number 2
Reproductive performance in three goat breeds under dry tropic conditions in Guerrero, Mexico
Language: English/Spanish
References: 25
Page: 147-157
PDF size: 409.95 Kb.
ABSTRACT
The aim of the present study was to assess the reproductive performance of three goat genotypes under semi-extensive dry tropic breeding conditions in Guerrero, Mexico. The experimental center is located at 18° 15´52´´ N. The animals used in the study were 7 males —two Creole, three Celtiberian and two Nubian— and 86 does —31 Creoles, 30 Celtiberian and 28 Nubian—. Females were bred during the breeding season (Oct-Dec) by controlled mating, using males of the same breed. Lambing occurred during Spring. Fertility rate was similar (P › 0.05) between Creole (58.1%) and Nubian (71.4%) groups and between Creole and Celtiberian groups (58.1% vs. 33.3%, respectively); however, the fertility rate was higher (P › 0.05) for the Nubian breed when compared with Celtiberians. Creole goats exhibited a higher prolificity index (1.4 ± 0.51 kids/kidding doe; P ‹ 0.05) than the one recorded for the other two assessed breeds: Nubian, 1.1 ± 0.30; Celtiberian, 1.1 ± 0.31 kids/kidding doe. Celtiberian breed showed a parturition-first estrus interval of 136.3 ± 30 days which was shorter than Nubian does (169.5 ± 27 days). No difference (P › 0.05) was found in the length of the postpartum anestrous between Creole (157 ± 0.28) and Nubian breeds. We conclude that from the breeds introduced into the region, the Nubian group presented a reproductive behavior similar to local Creole goats, but its postpartum anestrus was longer than in this local caprine genotype.REFERENCES
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