CONTROL THE ONSET OF PUBERTY BY APPLICATION OF GONADOTROPIN RELEASING HORMONE (GNRH) IN IRAQI LAMB RAMS
DOI:
https://doi.org/10.61841/fqgavk55Keywords:
lamb-ram, scrotal circumference, GnRH, testosterone, estrogen, electrical-ejaculator, urethral processAbstract
This study is designed to investigate further the effect of two GnRH level treatments on the onset of lamb-ram puberty and to minimize the incidence of sexual maturity age. Eighteen lamb-rams of 4-5 months of age with no previous history, body weight around 14-17 kg, and scrotal circumference around 8-10 cm were used in this study, which started in early November 2019 at the end of March 2020 at the animal yard of the Veterinary Medicine College, University of Baghdad, Al-Amerya state. Lamb-rams were randomly divided into three groups: 1) Group (A) was treated with GESTAR (GnRH 0.00042g) 2 2ml /lamb/48 hs. 2) Group (B) was treated withR (GnRH 0.00042 g) 1 ml/lamb/48 hs. 3) Group C received nothing and stayed as the control group. All experimental lambs received equal quantities of food as 2kg of straw and 1 kg of oat and barley (grained). Testicular circumference, body weight, and hormonal analysis were determined every 15 days. Results showed that the testicular weight of the group of 2 2ml GnRH(A) was 138.5±1.5 g, the group of 1 1ml GnRH( B) 190.0±10.0 g, and the control group(C) was 96.5±6.5 g. Sc was A) 25.5±0.5 cm, B) 29.75±0.75 cm, and C) 21.5±0.5 cm. Testicular length was A) 9.0±0.0 cm, B) 10.75±0.25 cm, and C) 7.25±0.25cm. Testicular diameter was A) 5.05±0.05 cm, B) 5.55±0.05 cm, and C) 3.5±0.1cm. Testicular size was A) 140.0±0.0 ml, B).0 ml, and C) 100.0±5.0 ml; animal weight was A) 37.5±1.5 kg, B) 42.0±3.0 kg, and C) 36.0±1.0 kg; testosterone level was A) 1.3±0.52 ng/ml, B) 2.12±0.74 ng/ml, and C) 0.271±0.18 ng/ml; estrogen level was A) 5.81±0.38 pg/ml, B) 11.63±3.7 pg/ml, and C) 5.15±0.22 pg/ml; volume of semen was A) 0.675±0.04 ml, B) 0.90±0.04 ml, and C) 0.60±0.04 ml; mass motility was A) 75.0±2.04%, B) 82.5±1.44%, and C) 65.0±2.04%; individual motility was A) 78.7. In conclusion ml of Gestar (0.00042 gm GnRH) is better at controlling and inducing puberty and sexual maturity in lamb-rams at 120 days of treatment.
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