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Articles by A.G. Yisa
Total Records ( 4 ) for A.G. Yisa
  S.S. Diarra , B.A. Usman , J.U. Igwebuike and A.G. Yisa
  The ban of meat meal in poultry feed in most countries of the world and the high cost of fish meal have resulted in the increased use of plant products in poultry diets. However, phytate, which is the main storage form of phosphorus in plants, exerts antinutritional effects in poultry due to its ability to form insoluble complexes with essential minerals and proteins. In addition to these effects, the excretion of excess phosphorus into the environment is a serious cause of environmental pollution. Deactivation techniques such as boiling, fermentation, soaking and enzyme treatment have been used to reduce the level of phytate in plant materials. However, these techniques add to the cost and reduce the nutritional quality of the finished feed through the loss of nutrients. The modes of action of phytate in poultry, its distribution in plants, some common deactivation techniques and their limitations and certain intrinsic qualities of plants that can minimize the effects of phytate in the consuming animal are reviewed. The use of plant and animal breeding as an alternative to deactivation by physical and chemical methods and the use of enzymes are also highlighted.
  A.G. Yisa , B. Yakubu , J.A. Edache , M.N. Danjuma and H.I. Deme
  A five week study was conducted to determine the effect of graded levels of toasted pigeon pea on growth performance and carcass characteristics of Japanese quail chicks. In a completely randomized design, three hundred unsexed, seven day old Japanese quails used for the study were divided into four groups of seventy five birds each. Each group was divided into three replicates of twenty five birds. Four isonitrogenous (24%CP) diets incorporating graded levels (0, 10, 20 and 30%) of toasted pigeon pea were evaluated. Average daily feed intake (18.62, 19.68, 19.58 and 20.29 g), Feed conversion ratio (4.87, 5.13, 5.36 and 5.38) and feed cost (Naira) per bird (38.34, 40.86, 41.46 and 43.57) increased (p<0.05) with increasing levels of dietary toasted pigeon pea inclusion. However, average daily weight gain (3.82, 3.83, 3.65 and 3.77 g) and dressing percentages (59.53, 61.91, 58.89 and 61.92) and percentage of breast to live weight were statistically similar (p>0.05) for all the treatments respectively. The back, wings, thighs and drumsticks were affected (p<0.05) by levels of toasted pigeon pea inclusion. By this study, pigeon pea may be included in diets of Japanese quails by not more than 10% for optimum growth and cost effective feeding.
  A.G. Yisa , J.A. Edache , A.D. Udokainyang and C.N. Iloama
  A four-week study was conducted to investigate the effect of partially or completely withdrawing fish meal from broiler finisher diets on growth performance and carcass yield. In a completely randomized design, ninety six (96) four-week-old Marshall Breed of broilers were allotted to four dietary treatments having 0, 50, 75 and 100% of their fishmeal content withdrawn. Each dietary treatment had 24 birds with 3 replicates of 8 birds. Results show that initial weights, final weights, average daily feed intake, average daily weight gain, feed conversion ratio and feed cost per kilogram gain were not negatively affected (P>0.05) by levels of fish meal withdrawal. Dressing percentages were also not significantly different (P>0.05) between treatment means. However, the percent carcass cut-up parts of breast, wings, thighs and drumsticks to live weight of birds fed diets with fish meal totally withdrawn were significantly less (P<0.05) than those of birds fed diets containing fish meal. From this study, it can be concluded that withdrawing fish meal from broiler finisher diets may not have any adverse effect on their growth performance provided protein is obtained from non-animal sources. However, total withdrawal of fish meal negatively affects optimum development of the cut-up parts and as such 0.5-1% fish meal may be included in broiler finisher diets for full development of carcass components.
  J.A. Edache , A.G. Yisa and E.J. Okpala
  A 6-week feeding trail was conducted to determine the effect of varying levels of yam peel meal (CP; 8.07% and ME; 2701 kcal/kg) on the laying performance of Japanese quails. One hundred and fifty 4 - week old female quails divided into 4 groups having 3 replicates of 12 birds each were used in this study. Four isonitrogenous (20% CP) diets incorporating graded levels (0, 10, 20 and 30%) of yam peel meal were compounded. The diets, however, varied in energy levels having 2,626 (Diet A), 2,553 (Diet B), 2,480 Diet C and 2,406 kcalME/kg (Diet D) respectively. Each diet was replicated three times. Average daily feed intake (34.77, 31.13, 31.50 and 33.23 g/bird) and hen-day production (30.06, 22.17, 18.81 and 16.19%) were significantly (p<0.05) affected by the test diets. However, respective daily weight gains (10.23, 8.93, 10.40, 7.83 g/bird), feed conversion ratio (7.96, 7.78, 6.90, 8.07) and egg weights (7.0, 8.8, 8.67 and 7.47 g) were not significantly (p>0.05) affected. As the level of yam peel meal increased in the diet, hen-day egg production was dropping. Feed cost/kg diet (N) decreased from diet A (41.24), B (38.02), C (34.52) to 31.02 (diet D) which had a cost saving of 25% over the control diet. By this study, it is indicated that at dietary crude protein level of 20% and Metabolizable Energy of between 2,480 and 2,626 kcal/kg, 20% level of yam peel meal inclusion in Japanese quail diet is acceptable for satisfactory egg production.
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