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This books deal with effect of seasons on dogs hormones and testicular parameters (anatomy, histology, sperms evaluations, cytoimmunochemistry) whereas its was the first trail that deal with effect of seasons on dog reproduction inside Iraq, the results show that the dogs were fertile during different seasons but the summer season has a negative effect on these parameters due to high hot season, while the spring was the highest in all parameters.

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Assistant Professor Dr. Nazih Wayes Zaid Specialization in Veterinary Theriogenology in College of Veterinary Medicine University of Baghdad. Have more than 25 published scientific researches in several journals in his scientific specialization. Member in many committee inside and outside his college. Participated in many conferences inside Iraq.

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