Abstract
The effect of turkey strain [BUT (Big-6), Hybrid Large White (HLW), and Nicholas (N-700)] on semen quantitative parameters (ejaculate volume, sperm concentration, and total number of sperm) and biochemical parameters (seminal plasma protein concentration, acid phosphatase activity in spermatozoa and seminal plasma, and antiproteinase activity of seminal plasma) was investigated over the reproductive period. The Big-6 strain had better quantitative parameters of semen compared with HLW and N-700 strains. Besides protein concentration, the Big-6 strain had the highest level of acid phosphatase activity in semen and antiproteinase activity in seminal plasma. The N-700 strain was characterized by reduced quantitative parameters and the lowest levels of all biochemical parameters in semen. While quantitative parameters of semen showed very little trend over the 21 wk of the reproductive season, the biochemical parameters increased several fold. Biochemical parameters of semen seemed to be more affected than quantitative parameters by age of the males. These changes may be related to decreasing semen quality with increasing age of male turkeys.
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