Comparative Study of Bacterial Contamination in Local Iraqi Sheep and Goats Semen

Background: Semen contamination is a detrimental factor in decreasing fertility. Seasonal changes may affect the contamination, too.  Objectives: This study was designed to detect semen contamination in ovine and caprine during different seasons.  Methods: Six fully mature male sheep and goats were subjected to electro-ejaculator collection twice monthly from February 1, 2022, to January 31, 2023 (Spring, February 1, 2022-April 30, 2022; Summer, May 1, 2022, July 31, 2022; Autumn August 1, 2022, October 31, 2022; Winter November 1, 2022, January 31, 2023), for studying the seasonal effect. A total of 288 semen samples were collected from both species (36 samples from each per season). All samples were subjected to bacterial isolation and identification.  Results: The results indicated that sheep semen had 4 different types of bacterial contamination with a higher number in contaminated samples than goat, which showed 5 different bacterial isolations. There were no significant differences (P 0.05) in bacterial contamination with regard to different seasons.  Conclusion: Different seasons appear not to affect bacterial contamination of semen in sheep and goats. Meanwhile, isolating all bacteria types was considered normal flora in both small ruminant species.