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To achieve estrous synchronization in 28 mature dromedary she-camels, four groups (7 in each), included animals i.m. injected with 250 μg GnRH analogue on day 0 and 5 ml PGF2α on day 10 (G1); CIDR for 10 days and 1000 IU eCG on day 8 (G2); 1000 IU eCG on day 0 and 5 ml PGF2α on day 10 (G3); control (G4). At the end of treatment, animals in heat were naturally mated. Results showed that follicular diameter (FD) decreased in G2 pre-treatment, increased in G2 and G3 and decreased in G1 at mating compared with G4 (P<0.05). FD was wider (P<0.05) in pregnant (P) than in non-pregnant (NP) animals. Estrus rate was 100% in all groups; estrus incidence and mating time were the longest in G4 (170.6 and 198.6 h) and the shortest in G2 (72.0 and 75.7 h), being shorter in P than in NP. (P<0.05). In all groups, P4 was similar pre-treatment, lower at mating and higher on day 70 post-mating in P than in NP (P<0.05). E2 was higher (P<0.05) in NP than in P on day 70 post-mating. Pregnancy rate was 57.14, 85.71, 71.43 and 42.86% in G1, G2, G3 and G4, respectively (P<0.05). Total number of CLs decreased in all treated groups, while CL diameter decreased in G1 as compared to G4 (P<0.05). Estrus/ovulation and higher pregnancy rate of camel could be hormonally induced by CIDR insertion for 10 days and eCG injection on day 8 of CIDR insertion.

Improving Fertility of Maghrabian She-Camels Treated with Different Hormonal Treatments during Breeding Season in Egypt