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Articles by Gamal A. Amrawi
Total Records ( 1 ) for Gamal A. Amrawi
  Reham S. Waheeb , Mohamed Ashry , Ahmed B.A. Ali and Gamal A. Amrawi
  Background and Objectives: Application of artificial insemination necessitates proper selection and evaluation of sires for libido and fertility. Deficiencies in either one of these characters can seriously compromise herd production. The objective of the current study was to investigate the effects of oral administration of GnRH stimulant (Theriogon®) on sexual behavior and semen characteristics of bulls. Materials and Methods: The study was performed on 16 native Egyptian bulls that were randomly assigned in 2 groups, control group (n = 8 bulls) received amino acid cocktail and treatment group (n = 8 bulls) received GnRH stimulant orally (100 mg kg–1 b.wt.,) once/week for 4 weeks. Serum and semen samples were collected twice per week starting 1 week before treatment and extended for 2 weeks after the last treatment. On semen collection site, libido index and reaction time were assessed. Collected semen samples were evaluated for ejaculate volume, pH, sperm motility, percentage of live sperm, sperm cell concentration, total sperm number per ejaculate and sperm cell abnormalities. Testosterone concentration was assessed in serum samples using radioimmunoassay (RIA). Results: Oral administration of GnRH stimulant resulted in significant gradual increase in testosterone levels from 2.36 ng mL–1 before treatment to 7.33ng mL–1 at week 5 after treatment, then declined to level similar to controls at week 7. The increase of testosterone levels was associated with increase in sexual activity expressed by increased libido index and decreased reaction time. Some parameters of semen quality represented by ejaculate volume, sperm cell concentration and total sperm count per ejaculate were also improved after GnRH stimulant treatment. Conclusion: Results of the current study suggest that treatment with GnRH stimulant (Theriogon®) could be used to improve sexual activity and some aspects of semen quality in bulls. Further studies are required to investigate the effect of Theriogon treatment on fertilizing ability.
 
 
 
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