Efficacy of Gonadotropin Releasing Hormone on Puberty in Iraqi Awassi Cross Breed Ewe Lambs

Alrawy, Ibrahim Younis; Hussain, Souhayla Oneeis

doi:10.21608/ejvs.2024.262822.1782

Efficacy of Gonadotropin Releasing Hormone on Puberty in Iraqi Awassi Cross Breed Ewe Lambs

Document Type : Original Article

Authors

¹ Department of Surgery and Theriogenology , college of veterinary medicine,University of Mosul,Mosul,Iraq

² Department of Surgery and Obstetrics, College of veterinary Medicine ,University of Baghdad , Baghdad ,Iraq

10.21608/ejvs.2024.262822.1782

Abstract

This study investigate how gonadotropin injection affects the growth and onset of puberty in Awassi crossbred ewe lambs. Methods: Fourteen Awassi cross breed ewes–lambs of 5±0.5months of age and average body weight (23.7±1.48) kg were divided into two equal groups at random. One group was used as a control, and the other received Gonadotropin Releasing Hormone (GnRH) treatment. Weighing was done on the ewe-lambs both before and after the experiment, Furthermore, measuring the body condition score, number of ewes expressing first estrus after treatment. Samples of blood were taken biweekly until the observation of pubertal signs (ten weeks). Progesterone and insulin-like growth factor-1 (IGF-1) were measured in sera samples. The results revealed that the group receiving gonadotropin reached puberty 17 days ahead of the control group.The body weight and body condition score of the GnRH treated Awassi ewe lambs were found to be higher compared to those of the control group. Gonadotropin administration had a beneficial effect on increasing progesterone and IGF-1. Conclusion Gonadotropin administration has accelerated puberty in Awassi ewe lambs and there are more trophic signals available, as seen by higher serum progesterone and IGF-1 secretions.

Keywords