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Articles by M. Mamman
Total Records ( 3 ) for M. Mamman
  T.A. Dare , P.I. Rekwot , Y.O. Aliu , M. Mamman , J.A. Obidi , N.P. Chiezey and B.O. Omontese
  The effect of season and Progesterone-Releasing Intravaginal Device (PRID) alone or with Pregnant Mare Serum Gonadotropin (PMSG) on ovarian function of 106 Bunaji cows was investigated in two seasons. In the dry season trial, 46 cows were randomly distributed into the following treatment groups: PRID alone (n = 16), PRID+PMSG (n = 15) and control (15). In the rainy season trial, 60 cows were randomly distributed into the following treatment groups: PRID alone (n = 20); PRID+PMSG (n = 20) and control (20). During the dry season, Bunaji cows treated with PRID alone had a significantly (p<0.05) lower estrus response than the cows administered with PRID+PMSG (37.5 vs 66.7%, respectively). During the rainy season, 65.0% of Bunaji cows treated with PRID+PMSG were found to be in estrus; this was not significantly higher than the value of 60.0% estrus rate recorded in Bunaji cows treated with PRID only. In PRID treated Bunaji cows, pregnancy rates of 25.0 and 45.0% was recorded during the dry and rainy season, respectively. Pregnancy rates in PRID+PMSG treated cows were 46.7 and 50.0%, respectively. Pregnancy rate was generally lower in the dry season than in the rainy season in both PRID only, PRID+PMSG and control groups. However, the highest pregnancy rate of 50.0% was obtained in PRID+PMSG treated Bunaji cows during the rainy season. Conception rate in Bunaji cows treated with PRID only (66.7%) was lower than cows treated with PRID+PMSG (70%) during the dry season although not significantly. Similarly during the rainy season, Bunaji cows treated with PRID+PMSG had a higher conception rate than cows treated with PRID only (76.9 vs 75.0%, respectively). This study suggests that the rainy season enhances greater ovarian function in dairy cows in the Northern Guinea Savannah zone of Nigeria and that administration of PMSG may potentiate fertility rates.
  S.F. Ambali , M. Mamman , A.O. Adaudi , K.A.N. Esievo , N.D.G. Ibrahim and M.S. Abubakar
 

Mushrooms are macrofungi widely consumed as food. However, many mushrooms rot away in the wild because of fear of toxicity. Therefore, lyophilized aqueous extracts of 6 mushroom species collected from Zaria, Nigeria and taxonomically identified as Chlorophyllum molybdites, Panaeolus subalteatus, Macrolepiota procera, Leucopaxillus albissmus, Hygrophoropsis aurantiacus and Pholiota aurea were screened for toxicity in mice. Lyophilized aqueous extract of each of these mushrooms was administered to three groups of 3 mice intraperitoneally (i.p.) at doses of 100, 1000 and 10, 000 mg kg-1, respectively. Another group of three mice given distilled water served as control. The mice were examined for clinical signs of toxicity over a period of 72 h and pathological examinations conducted on dead animals. The severity of clinical signs, onset of death and pathological lesions were dose dependent. Death occurred within 10 min in all the mice dosed at 10,000 mg kg-1 with the lyophilized extracts of all the mushrooms screened, with the exception of that of H. aurantiacus, which produced death 21-23 h post administration. This result showed that all the screened mushrooms, including the popular edible M. procera were found toxic. Therefore, since all the mushrooms screened were found toxic, it is recommended that extreme caution should be exercised in their consumption. Furthermore, in view of the regional differences in the toxicity of mushrooms, there is the need to screen more wild mushrooms found in Nigeria for toxicity. This will boost mushroom mycophagy, reduce poisoning incidence and reduce wastage of edible mushrooms in the wild.

  T.A. Dare , P.I. Rekwot , Y.O. Aliu , M. Mamman , J.A. Obidi , B.O. Omontese , N.P. Chiezey and J.S. Rwuann
  The effect of season and Progesterone-Releasing Intravaginal Device (PRID) alone or with Pregnant Mare Serum Gonadotropin (PMSG) on ovarian function of 106 Bunaji cows was investigated in two seasons. In the dry season trial, 46 cows were randomly distributed into the following treatment groups: PRID alone (n = 16), PRID+PMSG (n = 15) and control (15). In the rainy season trial, 60 cows were randomly distributed into the following treatment groups: PRID alone (n = 20); PRID+PMSG (n = 20) and control (20). During the dry season, Bunaji cows treated with PRID alone had a significantly (p<0.05) lower estrus response than the cows administered with PRID+PMSG (37.5 vs 66.7%, respectively). During the rainy season, 65.0% of Bunaji cows treated with PRID+PMSG were found to be in estrus; this was not significantly higher than the value of 60.0% estrus rate recorded in Bunaji cows treated with PRID only. In PRID treated Bunaji cows, pregnancy rates of 25.0 and 45.0% was recorded during the dry and rainy season, respectively. Pregnancy rates in PRID+PMSG treated cows were 46.7 and 50.0%, respectively. Pregnancy rate was generally lower in the dry season than in the rainy season in both PRID only, PRID+PMSG and control groups. However, the highest pregnancy rate of 50.0% was obtained in PRID+PMSG treated Bunaji cows during the rainy season. Conception rate in Bunaji cows treated with PRID only (66.7%) was lower than cows treated with PRID+PMSG (70%) during the dry season, although not significantly. Similarly during the rainy season, Bunaji cows treated with PRID+PMSG had a higher conception rate than cows treated with PRID only (76.9 vs 75.0%, respectively). In conclusion, this study suggests that the rainy season enhances greater ovarian function in dairy cows in the Northern Guinea Savannah zone of Nigeria and that administration of PMSG may potentiate fertility rates.
 
 
 
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