Influence of season on characteristics of the ejaculate from bulls in an artificial insemination centre in Nigeria |
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| Institution: | 1. Department of Veterinary Medicine, State University of Ceará, CEP: 60740-000 Fortaleza, Ceará, Brazil;2. Department of Animal Science, Federal University of Ceará, CEP: 60356-000 Fortaleza, Ceará, Brazil;3. Department of Biochemistry, Federal University of Ceará, CEP: 60356-000, Fortaleza, Ceará, Brazil;4. Department of Pharmacy, University of Fortaleza, Ceará, CEP: 60811-905, Fortaleza, Ceará, Brazil;5. Department of Nutrition, University of Fortaleza, Ceará, CEP: 60811-905, Fortaleza, Ceará, Brazil |
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| Abstract: | The influence of season on the ejaculate characteristics of Zebu, Friesian and their crossbred bulls in an A.I. programme in Nigeria was investigated over a 2-year period.Ejaculate volume, sperm concentration, percent morphologically normal spermatozoa and percent live spermatozoa were significantly higher in the rainy season than in the dry season. Total spermatozoa per ejaculate averaged 3.32 × 109 and 10.10 × 109 for the dry and rainy seasons respectively. Corresponding proportions of total morphologically defective spermatozoa per ejaculate were 14.05% and 6.46%. Percent live spermatozoa were 82.34% and 84.61% while the corresponding sperm concentrations were 0.97 × 109 rmand 1.74 × 109 for the dry and rainy seasons respectively. All differences were statistically significant (P < 0.05).Ejaculate quality was better during the rainy season. Consequently semen collected and frozen during the rainy season may produce higher fertility rates in an A.I. programme. |
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