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Articles by J.O. Oyewale
Total Records ( 4 ) for J.O. Oyewale
  O.I. Azeez , J.O. Oyewale and O.O. Okunola
  The erythrocyte osmotic fragility and other erythrocyte indices in fowls of two different age groups (7-9 week-old and 49 week-old) were studied using Nera Black strain usually raised commercially for egg production in Nigeria. Erythrocytes in the 49 week-old birds were more fragile than those in the 7-9 week-old at sodium chloride (NaCl) concentrations of 0.2% (p<0.05), 0.7% (p<0.05), 0.8% (p<0.01) and 0.9% (p<0.01). The mean corpuscular haemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCH) values were also higher in the adults, but the packed cell volume (PCV) was lower. The haemoglobin (Hb) concentration, red blood cell (RBC) count and mean corpuscular volume (MCV) were similar in the two age groups.
  O.I. Azeez , A.A. Oyagbemi and J.O. Oyewale
  Diurnal fluctuation in haematological parameters such as packed cell volume (PCV), red blood cell (RBC) count, haemoglobin concentration (Hb), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC) and erythrocyte osmotic fragility of the domestic fowl in the hot humid tropics was investigated using Nera Black cocks. Blood samples were collected from the birds at 6:00 am, 10:00 am, 2:00 pm, 6:00 pm, 10:00 pm and 2:00 am during a 12-hour light and a 12-hour dark period. PCV showed considerable diurnal variation with the lowest value obtained at 10:00 am and the peak value recorded during the early morning (2:00 am). RBC, Hb, MCH and MCHC values also varied according to the time of the day, with the lowest values observed at 2:00 pm, probably as a result of haemodilution following increased feed and water consumption at this period of the day. Peak values for RBC, Hb, MCH and MCHC were observed at 10:00 pm when the birds were already roosting (during the dark phase of the day) as a result of which physical and metabolic activities were generally lowered. Haemoconcentration so produced might be responsible for the higher haematological parameters during the night because the birds were neither eating nor drinking water at this period of the day. Erythrocyte osmotic fragility at 0.3% NaCl concentration was also significantly higher (P < 0.05) at 6:00 am than at any other period of the day.
  O.I. Azeez , A.A. Oyagbemi and J.O. Oyewale
  The effects of transportation stress and pretreatment with non-enzymic antioxidants vitamins C and E on the erythrocyte osmotic fragility, haematocrit, haemoglobin, red blood cell and white blood cell counts, Mean Corpuscular Volume (MCV), Mean Corpuscular Haemoglobin (MCH), Mean Corpuscular Haemoglobin Concentration (MCHC) and the differential leucocyte counts were investigated using the domestic chicken. About 32, adult female domestic chickens of the Nera black strain were used. The birds were divided into four groups A-D consisting of 8 birds each. Groups A and B did not receive any medication. Group C received vitamin C (650 mg kg-1 diet) while D, vitamin E (270 mg kg-1 diet) in feed for 2 weeks. Birds in groups B, C and D were transported through a distance of 200 km. Blood samples were collected within 30 min after the journey for analysis. Contrary to the expectation, the erythrocyte osmotic fragility was lower in the transported, untreated birds than the control while those pretreated with vitamins C and E had higher osmotic fragility. Haemoglobin and MCHC values were higher in the transported, untreated while other parameters were similar. This study demonstrated that nucleated erythrocytes of the domestic chicken unlike other animals with non nucleated erythrocytes, respond to acute stress by increase in osmotic resistance and membrane stability in hypotonic solution, this was antagonized by pretreatment with vitamins C and E.
  A.A. Busari , J.O. Oyewale , J.A. Akinlade , M.K. Adewumi , S.O. Okunola and J.A. Alalade
  Inadequate nutrition remains a major constraint to improved cattle production in the traditional agropastoral system of derived savanna in Nigeria. Consequently, a trial to study effect of supplementary feeding of dried brewers spent grain to grazing cattle in the dry season was carried out in four selected Fulani herds located in the four axis of the derived savanna zone. In the trial, studies were carried out on eight N’dama and eight Bunaji bull calves in a 2×2 factorial arrangement of complete randomized block design. The supplement DBSG (24% CP) was fed at the rate of 1 kg/calf /day for the period of 3 months. The calves on supplementation consumed an average of 0.80 kg day–1 of the supplement. The average daily weight gains were higher for bull-calves on supplementary feeding (85/day for N’dama versus 56 g day–1 for Bunaji) than those without the supplement (17 g day–1 for N’dama versus 11 g day–1 for Bunaji). Ndama cattle gained more weight than Bunaji. Financial analysis showed that the net benefit for the two breeds fed with or without supplementation was higher for N’dama than for Bunaji. Supplementation had a significant (p<0.05) effect on animal PCV, RBC and Hb values. There were significant interaction between hematological parameters and protein intake except for leukocyte count. The study showed that dietary protein supplementation had asignificant influence on haemotogical parameters; body weight gains and the net economic returns. Thus, dry season feed supplementation with dried brewers spent grain had a positive effect on Bunaji and N’dama bull calves being raised in a traditional Fulani herd and could be encouraged as a strategy to boost cattle productivity during the critical dry season.
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