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Articles by Ojewola, G.S.
Total Records ( 5 ) for Ojewola, G.S.
  Ojewola, G.S. , J.O. Otteh and S.F. Abasiekong
  African Yam Bean (AYB) meal and Nutrase-xyla enzyme were evaluated for their nutritive and economic efficiency in broiler starter diets. Six diets were formulated, a control (D1) and five others. AYB meal and fish meal were the major plant and animal protein sources. Diets 2,3,4,5 and 6 were supplemented with nutrase-xyla enzyme at 10g/100kg, 20kg/100g, 30g/100kg, 40/100g and 50g/100kg diet respectively. The calculated percent crude protein of the diets was 25 while metabolizable energy was 3100kcal/kg. One hundred and forty-four (144) day-old unsexed Anak 2000 strains of broiler chicks were used for the trial. Each treatment consisted of 3 replicates of 8 birds in a Completely Randomised Design (CRD). The experiment lasted 5 weeks. The results showed that the mean body weight gain and feed-to-gain ratio were significantly (P<0.05) depressed. D1 had the highest body weight gain (603.02g) while diets 2,3,4,5 and 6 were 331.66g 300.83g, 300.56g, 342.36g and 341.25 respectively. The total revenue realizable from Diet 1 (N361.81) was significantly (P<0.05) higher than the other diets. It was therefore concluded that the use of AYB meal with or without nutrase-xyla enzyme supplementation is not efficient and research efforts need be made towards the provision of appropriate characterization of AYB carbohydrate, protein and anti-nutritional components to allow for development of appropriate enzymes and toxin binders that could enhance their nutritive value and utilization.
  Ojewola, G.S. , S.F. Abasiekong , M.U. Uko and M. Oguike
  The effect of dietary lysine supplementation at varying levels on the reproductive performance of rabbits of mixed breed was investigated. A total of twenty (20) does with average weight of 1.85kg were used for the study in a Completely Randomized Design (CRD). The experimental diets consisted of concentrate mash (16.87% CP and 2564.84 kcal kg 1ME) supplemented with 0.00, 0.10, 0.20, 0.30 and 0.40 lysine levels, respectively, designated as diets 1, 2, 3, 4 and 5 with 4 replications having one doe per replicate, thus making a total of 4 rabbits per treatment. The experiment lasted 11 weeks (77 days). The results showed that the various parameters among which are gestation length, average litter size at birth, litter weight at birth, litter weight and size at weaning were not significantly influenced (p>0.05). Nonetheless, rabbits fed diet 3 gave the best mean litter weight (1272 g) at weaning, while diet 2 has the highest (5.44) weaning size. It was also observed that individual kit weaning weight differed from treatment to treatment depending on the litter size at weaning; the higher the litter size at weaning the lower the individual weaning weights. In conclusion, lysine supplementation and total dietary lysine in rabbit diets should not exceed 0.20% and 1.01%, respectively.
  Ojewola, G.S. , S.F. Abasiekong , M.U. Uko and S. Akomas
  Five graded levels of dietary methionine supplementation were compared in an isonitrogenous (16.87%CP) and isocaloric (2564.84 kcal kg-1) diets fed twenty (20) matured female rabbits (mixed breed) with mean weight range of 1875g and 1893g. The trial lasted 11 weeks (77 days). The rabbits were randomly allocated to the five dietary treatments in a Completely Randomized Design (CRD). Each treatment was replicated four times with one rabbit per replicate. All the parameters considered were significantly influenced (p<0.05) except the average litter weight at birth. The mean number of matings (1.0 to 2.0) to conception and gestation length followed no discemible pattern. However, premature litters were produced by rabbits fed diet 5. Mean litter size at birth and mean litter weight respectively ranged from 3.17 to 6.00 and 214g to 29lg and followed no definite pattern. Heavier birth weights were obtained in all the diets (1-4) only with the exception of rabbits fed diet 5. The mean litter size at weaning also rose from D1 to D4 only with an exception to rabbits fed Diet 5. The best mean litter weight at weaning was obtained from rabbits fed diet 4. Methionine supplementation at 0.3% therefore, produced a better kit weaning weight, an indication that total dietary methionine content should not exceed 0.61% under a tropical condition. 100% mortality of kits was obtained in rabbits fed D5, an indication that 0.71 dietary methionine content is deleterious to the survival of rabbits.
  Ojewola, G.S. , A.O. Olojede and C.G. Ehiri
  Two experiments were carried out to evaluate the replacement value of Rizga and Hausa potato for maize in broiler chicken. In experiment 1, three treatment diets with 2 replications each were fed to broiler chickens in a Completely Randomized Design (CRD) using a deep litter management system. The dietary maize of the diets was substituted with Hausa potato at 0%, 50% and 100% respectively. The results showed that all the parameters measured were significantly (P<0.05) influenced. Mean body weight (g) and realizable revenue (N) were depressed as the substitution level increased from 50% to 100% while feed intake responded in an inverse manner to the increasing substitution of maize for Hausa potato. The experiment lasted 5 weeks. In experiment 2, three treatment diets with 3 replications each were fed to broiler chickens in a completely Randomized Design (CRD) using a one- tier cage design. The dietary maize of the diets was substituted with Rizga at 0%, 50% and 100% respectively. The results showed that, of all the parameters considered, only the feed-to-gain ratio and total revenue (N) were significantly ((P<0.05) influenced. Mean body weight gain (g) was numerically depressed from 1119.50g (D1) to 1053.00g (D2) and 889.00g (D3). The feed intake numerically increased from 1665.0g (D1) to 2474.90g (D2) and 2297.52g (D3). The mean total revenue (N) realizable significantly decreased for birds fed diet 3 while diets 1 and 2 are comparable. In conclusion, substituting dietary maize with Hausa potato or rizga in broiler ration as shown in these trials seemed productively and economically inefficient, nevertheless, more research effort is still required so as to improve on the utilization of these neglected and under exploited root crops for efficient poultry production.
  Ojewola, G.S. , O.E. Opara and O. Ndupu
  Two trials were conducted to investigate the effect of palm oil supplemented and unsupplemented cassava meal for maize in broiler ration. One hundred 7-day old unsexed broiler chicks of Arbor acre strain were used in each trial. Both trails had birds randomly allotted to each of five treatment diets with two replicate groups per diet in a Completely Randomized Design (CRD). Each treatment groups had 20 birds with 10 birds per replicate. Each of the trials lasted 5 weeks. In trial 1, dietary maize was substituted for cassava meal at 0, 25, 50, 75 and 100%. The result shows that birds fed diet 1 had significantly higher (p<0.05) mean final live weight gain (1344.0g) and mean total cost of feed consumed (N200.40) while the mean total weight gain (g) among the various treatments was comparable. The feed- to- gain ratio became numerically poorer (2.41 to 3.64) as the substitution level of cassava meal for maize increased from 25 to 100% while the cost decreased (N69.00 to 50.74) numerically, though, 25% and 50% substituted levels seemed advantageous both in terms of performance and economics of production. In trial 2 five isonitrogeneous (24%CP) and isocaloric diets (3000 kcal/kgME) were formulated with a progressive (0, 25, 50, 75 and 100% replacement of maize with palm oil supplemented cassava meal. In feeding trial, the mean total weight gain, feed-to-gain ratio and cost of total feed intake were significantly influenced (p<0.05). Birds fed diet 2 gave the best (p<0.05) performance, followed by diet s 1 and 3, while others gave a poor performance. Both the cost per kg feed (N) significantly decreased (p<0.05) as the level of substitution increased from 0-100%. Therefore substituting dietary maize with palm oil supplemented cassava meal at 25% demonstrates both productive and economic advantage over diet 1 and others.
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