The Effect of Exogenous Oxytocin and Prostaglandin-F2α Hormones on Estrus Synchronization and Conception Rate in Nubian and Nilotic Goats of Sudan

Abstract

Twenty nine Nubian does were considered for estrus synchronization, and devided into 3 groups: G1 (n=9) treated with 50 IU of Oxytocin, G2 (n=10) treated with 100 IU oxytocin and G3 (n=10) as control group. Synchronies obtained were, G1 (50i.u-OT) 75%, G2 (100i.u-OT) %50% and G3 (Control) 40%. There were no significant difference, (P >0.05), in estrus synchronies between the three groups under 50 and 100 IU oxytocin doses treatments against the non-treated control group. In determining the effect of genetic differences on estrus synchronization with the PGF2α injections, two groups of Nubian (n=29) and Nilotic (n=19) does were considered. The synchronies percentages obtained were, the Nubian breed, 96.55% and the Nilotic breed, 78.95%. There were no significant difference, (P >0.05), of the breed on estrus synchronization using (PGF2α) injections. In determining the effect of exogenous oxytocin on estrus synchronization in Nilotic does of Sudan, 16 does were considered for this experiment. They were devided into two equal groups, Ga, treated (50 IU.OT), and Gb, (Control).The percentages of synchronies obtained were, 75% for Ga, and 50% for Gb.There were no significant difference, (P>0.05),in estrus synchronies between the two groups under 50 IU oxytocin treatment against the non-treated control group. For determining conception rates, four groups of Nubian does, Ga (n=7) treated with 50 IU of oxytocin, with single insemination, Gb (n=7) treated with 50 IU, with double inseminations, Gc1 (n=7) control group with single iii insemination, Gc2 (n=7), control group with double inseminations were considered. They were artificially inseminated with Saanen fresh semen after estrus synchronization with PGF2α. the percentages of pregnancies considered were, Ga(50i.u.OT),1 AI,28.6 %, Gb (100 i.u.OT), 2 AIs, 14.3 %, Gc1 (Control), 1 AI, 28.6 % and Gc2 (Control), 2 AIs, 57.1 %. There were no significant difference, (P >0.05), in numbers of pregnancies obtained under oxytocin treatements against the non-treated, or with the two inseminations against single insemination. In an other experiment, two groups of Nilotic does, Ga (n=7) treated with 50 IU oxytocin and Gb (n=8) was the control group were considered for detecting the effect of exogenous oxytocin hormone on conception rate in Nilotic does. They were inseminated once after estrus synchronization by PGF2α. The percentages of pregnancies obtained were, 71.43% for Ga (50 IU.OT) and 75% for Gb, (Control group). There were no significant difference, (P >0.05), in pregnancies happened under oxytocin treated group against the non-treated one. Statistical analysis method used was χ².