EFFECT OF L-TYROSINE ON GROWTH PERFORMANCE, AGE OF SEXUAL PUBERTY, SEMEN QUALITY AND TESTOSTERONE LEVEL IN FRIEZIAN BULLS

Document Type : Original Article

Authors

• M. A. Abu El-Hamd
• M. S. Sayah

Animal Production Research Institute, Agricultural Research Center, Dokki, Giza, Egypt

Keywords

• Friesian bull
• L-tyrosine
• puberty
• testosterone and semen quality