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University of Khartoum (2004)

Reproductive performance of Desert Goats under semi-intensive system in the Sudan

Alli Mohammed Hussein Elzagafi

Titre : Reproductive performance of Desert Goats under semi-intensive system in the Sudan

Auteur : Alli ;Mohammed Hussein Elzagafi

Université de soutenance : University of Khartoum

Grade : Master of Science (MS) 2004

Résumé partiel
This study was conducted on Desert goats to investigate some reproductive traits including puberty age, oestrous cycle length, oestrous duration, gestation period, post partum and the efficacy of different hormonal treatments (PGF2α and progesterone with or with out eCG) in inducing and synchronization oestrous cycle, to improve the reproduction efficiency, and to evaluate some reproductive traits of Desert goats in d their original habitat an in semi-intensive system. Forty eight females Sudanese Desert goats between 1-5 year of age and body weight 15-36 kg were brought from Belala 20 kilometers southeast Nyala the animals were randomly assigned to hormonal treatment A. B. C and D. Group A was kept as untreated control, in group B does were treated with CIDR, 0.3 gram progesterone for 14 days. In group C as in group B, plus intramuscular injection of 600IU of PMSG two day before CIDR removal. While in group C does were given two injections of prostaglandin PGF2α, 11 days a part. All the treated does were artificially inseminated with fresh semen, diluted with skimmed milk 24, hours after the onset of oestrus. Those returning to oestrus were reinseminated. The results showed that all hormonal treatments used in this study were found to induce and synchronize oestrus in the Sudanese Desert goats. The response of the does to PGF2α was significantly higher (100%) (P<0.05) than that obtained with progesterone (83.33%) with or without PMSG (50%). There was no significant difference between the interval from end of treatment to oestrous occurrence between different hormonal treatment (P>0.05), it was 42.33±10.98 hours in group B, 39.80 ±14.44 hours in group C, 38.83±12.16 hours in group D. Also there was no significant difference in oestrous duration between the different hormonal treatments ; it was, 27.33±7.87 hours, 30.00±7.6 hours, 30.17±8.46 hours, in group B, C and D respectively. The higher non-return rate obtained in treatment C (80%) and the lower in treatment B (50%) for first insemination ; however, after the second insemination it was found that the higher non return-rate was in group D (33.33%).

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