FACULTY OF VETERINARY MEDICINE

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Author: search.filters.author.Ola-Davies, O. E.Subject: search.filters.subject.Fertility

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    The reproductive implications of clomiphene citrate on sperm cells during the epididymal transit of spermatozoa in male wistar rats
    (2006) Oyeyemi, M. O.; Towobola, B. A.; Ola-Davies, O. E.
    The reproductive implications of Clomiphene citrate (CC) on male Wistar rats revealed the reactions of the rats to CC at different dosages (varied). Results revealed detrimental effects at a higher dosage. In the caput of the epididymidis, the mean percentage motility in group B Wistar rats (20.0 ±8.66) and group C Wistar rats (23.3 ±3.33) was significantly lower (P<0.05) than group A Wistar rats (42.0 ± 2.00). The drug did not influence the percentage livability of the spermatozoa in the caput epididymidis. In the corpus epididymis the mean percentage motility for groups A — C were 56.00 ±2.45, 25.56 ±7.50, 13.00 ±5.77, respectively. Group A value was significantly higher than those of groups B and C. The percentage livability was higher in-group A than B and C. The concentration of the spermatozoa was significantly higher in group A (78.25 ±6.97. 106) than groups B (53.75 ±1.89. 106), though this is not significantly different (P<0.05). These findings were discussed in relation to the significance of the drug as a fertility enhancer in infertile animals. The reproductive implications of the drug were studied in the epididymis of Wistar rats with no adverse effects when used at the recommended dose. The drug can therefore be used to boost the reproductive potential of infertile male animals.
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    Effect of successive ejaculations on the spermiogram of West African dwarf goats (Capra hircus L.)
    (Faculty of Veterinary Medicine, University of Zagreb, 2000) Oyeyemi, M. O.; Akusu, M. O.; Ola-Davies, O. E.
    Twenty healthy adult male (bucks) West African dwarf goats (WADG) aged between 2 to 4 years and with a mass of from 16 to 20 kg were used in this study. They were randomly assigned into four groups of five bucks per group. In group A, semen was collected once a week for a period of eight weeks, while in group B semen was collected twice a week for a period of eight weeks, once a day for 21 days in group C, and twice daily at an interval of five hours for 21 days in group D. Live body masses, height at withers, scrotal length and scrotal circumference were not affected by successive ejaculations. The ejaculate volume decreased as the frequency of ejaculations increased, although the decrease was not significant (Group A 0.44±0.07, B 0.41±0.08, C 0.38±0.07 and D 0.36±0.08 ml) while the ejaculate colour was either milky or creamy. Mass sperm movement showed swirling waves and scored 4 in all groups, while the percentage progressive motility ranged between 88.7±3.10 and 94.54±3.00%. Percentage of live spermatozoa (Group A 96.57±2.40, B 96.24±2.53, C 96.10±2.28 and D 96.10±2.50%) was not affected by successive ejaculations although a decrease in sperm concentration was observed as the number of successive ejaculations increased. There was a significant increase (P<0.05) in abnormal spermatozoa as frequency of ejaculation increased.