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ABSTRACT: Morphologically abnormal sperm reduces fertilization rates and embryonic development that results infertility. The objective of the study was to evaluate the morphological abnormalities of frozen-thawed bull sperm used for artificial insemination (AI) in Bangladesh. Isotonic formol saline fixed frozen-thawed sperm of local zebu (n=20) and crossbred (n=20) bulls were used in this study. Sperm morphology was determined for at least 200 sperm per bull by differential interference contrast (DIC) microscopy with oil immersion optics. Results showed that morphologically normal sperm were lower (p<0.05) in crossbred (74.6±1.8%) than zebu bulls (79.0±2.1%) whereas, abnormal sperms were higher in crossbred (25.5±1.8 %) than zebu bulls (21.0±2.1%). The specific sperm head defects were increased in crossbred than zebu bulls (p<0.05) but mid-piece and tail had no significant defects between crossbred and zebu bulls. Although morphologically abnormal sperms were higher in crossbred bulls, both types of bulls had standard satisfactory level of morphologically normal sperm i.e at least 70% morphologically normal sperm with no more than 20% of head abnormality. Therefore, the quality of frozen semen either from crossbred or zebu bulls distributed by the department of Livestock Services was found suitable to disseminate male germplasm for AI program in Bangladesh.
Keywords: Frozen-thawed sperm, bull, morphology, artificial insemination, Bangladesh
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