High-fertile and productive dairy animals are important to satisfy the growing population's demand. Sire fertility is one of essential factors that regulate overall pregnancy rate herds. However, sire varies from 10 90%, suggesting male largely accounts for varying levels across herd. Sub-fertile bulls females should be identified discarded promptly improve herd's productivity. The most dominan...

Aim of this study is to evaluate the effect adding different levels Zinc and Selenium on extender as antioxidants improve Friesian-bull semen quality after cryopreservation. Semen was collected, pooled, extended with five treatment extenders, including control without (E1), 0.3 mg/100ml Zn (E2), 0.6 (E3), 0.2 Se (E4), 0.5 (E5). evaluated for visual parameters dilution, equilibration, thawing. A...

| There are several types of antioxidants which can be use in buffalo semen preservation. The current study was performed to the influence viz., Coenzyme Q10 (CoQ10), L-Carnitine (LC), or N-Acetyl-Cysteine (NAC) added extender on freezability and fertility spermatozoa. Semen Egyptian bulls (n=5) were pooled extended with tris (1:10) without addition antioxidant (E1), i.e., 0.03 mM CoQ10 (E2), 3...