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Articles by A.J. Shoyombo
Total Records ( 2 ) for A.J. Shoyombo
  A.A. Musa , S.E. Abdulmalik , A.J. Shoyombo , O.M. Akinsola and T. Usman
  Background and Objective: Nigerian indigenous chickens play a vital role in food security. This study aimed to determine the relationship between morphometric traits, predict body weight and classify three Nigerian indigenous chicken genotypes using multivariate analyses. Methodology: Data were obtained from a total of 808 randomly selected, matured and extensively reared Nigerian indigenous chickens, comprised of 490 normal feathered (NF), 170 frizzle feathered (FF) and 148 naked neck (NN) genotypes. Results: The phenotypic correlation between the morphometric traits ranged from 0.08-0.74, -0.11-0.76 and 0.03-0.77 for NF, FF and NN, respectively, with breast girth and tibia length being the most correlated to body weight. Three principal components from the factor analysis of morphometric traits explained about 75-84% of the total variance across genotypes. Regression models using original morphometric traits as predictors explained 44-65% of the variation in body weight across the genotypes, while orthogonal traits explained 29-62%. The discriminant analysis revealed some intermingling between the NF and NN genotypes, while NF and FF were almost distinct. Conclusion: We concluded that some morphometric traits could serve as markers for body weight but are genotype specific. The intermingling between NF and NN suggests that there is unrestricted gene flow and intermingling between NF and NN, which may pose a threat regarding genetic conservation.
  O.O. Alabi , A.J. Shoyombo , O.B. Akpor , O.M. Oluba and A.G. Adeyonu
  The feed fed to broilers is a determinant of digestibility, absorption and utilization of nutrient by the birds. The increasing cost of poultry production currently for feed formulated from conventional feed ingredients has made the use of cheaper, lesser known and unconventional feed ingredients a possible way of reducing the cost of production and providing more profit to poultry producers. However, most of the alternative feed ingredients are richer in Non-Starch Polysaccharide (NSP) content, the high content of NSP invariably affect animals’ performance in different ways. To mitigate the anti-nutritional factors of NSP, the use of feed enzymes are employed. This is so, since the endogenous enzyme secreted in the gastro-intestinal tract of broilers cannot digest NSP, therefore, it is desirable to supplement high fibrous feed with exogenous enzymes for effective and efficient digestion of NSP content and better performance of the birds in terms of feed intake, growth rate, feed conversion efficiency, body weight gain and carcass characteristics. These exogenous enzymes are readily obtainable from different microorganism such as Bacillus subtilis, Trichoderma longibrachiatum, Aspergillus niger, Trichoderma viride, Humicola insolens. The enzymes preparations are available under various trade names such as Nutrase xyla, Histazyme, Avizyme, Natugrain, Allzyme, Grindazyme, Roxazyme G, Avizyme, Maxi-grain, Natuzyme and others. In this review, exogenous enzyme for broiler’s diet, features of bacterial and fungal xylanase enzymes, effect of xylanase and phytase on broiler nutrition, qualities of commercial enzymes and benefits of enzyme supplementation was discussed.
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