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Articles by D.M. Ogah
Total Records ( 5 ) for D.M. Ogah
  A. Yakubu , D.M. Ogah and R.E. Barde
  A study was conducted in Nasarawa State, North Central Nigeria to determine the productivity and egg quality traits of free range naked neck and full-feathered chickens. A total of one hundred and two smallholder farmers were randomly selected. Information was obtained on average eggs per clutch, hatchability and mortality, while hen`s body weight was measured directly on the day of egg collection. One hundred and two freshly laid eggs (51 eggs from each genotype) were used to evaluate external and internal egg qualities. Body weight and average eggs per clutch were significantly (p< 0.05) higher in naked neck genotype compared to the normal feathered birds (1.30 vs. 1.16kg; 11.63 vs. 9.71 respectively). Normal feathered genotype recorded higher mortality (36.85%) than naked neck birds (28.60%). No significant (p> 0.05) difference was found between the two genotypes in hatchability. Mean values for egg weight, egg length, egg width, egg shape index, shell thickness, albumen weight, albumen height, yolk weight, yolk height, yolk width and haugh unit were significantly (p< 0.05) higher in naked neck hens than their normal feathered counterparts. There was no superiority in shell weight and yolk index. The association between egg weight and other egg biometrical traits were found to be positive and significant (r = 0.22-0.79; p< 0.05). Other egg parameters were either positively or inversely correlated with each other. Egg weight was better predicted (R2 = 34.44%) using a combination of egg length and egg width. The estimation of shell weight from egg length, egg width and egg weight gave lower values (R2 = 2.86-3.91%). The incorporation of allometry improved the prediction accuracy of shell thickness, albumen weight and yolk weight from egg weight (R2 = 44.16,43.89 and 49.89%). It is concluded that the introgression of the naked neck gene into poultry could play a pivotal role in the genetic improvement of traditionally managed flocks.
  N.D. Yusuf , D.M. Ogah , D.I. Hassan , M.M. Musa and U.D. Doma
  Two hundred and forty 7 days old Anak 2000 broiler chicks were used to determine the growth rate and economic of broiler fed decorticated fermented Prosopis africana seed meal (DFPSM). Five experimental diets containing 0, 25, 50, 75 and 100% DFPSM replacement levels for full fat soybean meal were fed to broiler for 8 weeks. The experiments were in a completely randomized design (CRD) with five treatments, each replicated four times with 48 birds per treatment and 12 birds per replicate. The average live weight of broiler ranged from 2500-2850g in each dietary group and were significantly (P < 0.05) affected by dietary treatment, similarly the growth rate and feed conversion ratio were also significantly affected by the dietary treatment (P < 0.05) .The study indicate that 20% inclusion of DFPSM with soybean meal could be used in a broiler diet.
  D.M. Ogah
  Inter and intra specific variation among muscovy duck ecotypes from three agroecological zones of Nigeria were studied The work evaluate the morphological variation of three ecotypes ( rainforest ecotypes, humid or guinea savanna and dry savanna ecotypes) covering southern or coastal region, central and northern part of Nigeria. Twelve morphological traits including weight were considered. Significant (p<0.05) variation exist within and between ecotypes using population coefficient of variation (ANOVA) bill height had the highest coefficient of variation 79.52 while body length recorded the least variation. There are marked differences in body morphology between sexes in all the ecotypes indicating significant sexual dimorphism. Correlation between the traits were low to high. The inter specific variations in bill structure and body morphology are indication of adaptation to the environment and influence of ecological condition
  D.M. Ogah , A.A. Alaga and M.O. Momoh
  Eleven body measurements were taken on 320 adult Muscovy duck (124 male and 196 females) within the guinea savanna zone of central Nigeria. The body measurements included Body Length (BDL), Body Width (BDD), Bill Length (BLL), Bill Width (BLD) Bill Height (BLH), Shank Length (SHL), Body Height (BH), Head Length (HL) Neck Length (NL), Head Width (HD) and Wing Length (WL). Sex had significant influence on all traits with higher means recorded for male traits. The correlation coefficient of the body measurements range from negative to moderately high for both sexes. In factor solution of the principal component analysis with VARIMAX rotation of the transformation matrix, four factors with ratio variances of 71.85% were identified for male, the first factor accounted for 36.66% and had its loading for body width, bill width, shank length and body height. In female 2 factors with ratio variances of 53.04% were extracted, the first and the second factors explain 36.76 and 16.27% of the generalized variances with the first had its loading on body length, bill width, body height, neck length and wing length respectively. From the result factor loading in Muscovy duck is sex dependent and can be exploited in improvement programme for the bird.
  D.M. Ogah , A.A. Alaga and M.O. Momoh
  Factor and multiple regression analysis were carried out on morphological traits (body length, body width, bill length, bill width, bill height, shank length, body height, head length, head width, neck length, wing length, chest circumference and body weight) of male and female muscovy ducks. Obvious sexual dimorphism was exhibited between sexes, relationship between body measurement and body weight were examined through factor and multiple linear regression analysis. Three factors had positive significant effect on body weight of the male muscovy representing size and shape while only one factor had positive relationship with body weight in female, accounting for 84.2% and 63.5% of variation in body weight for male and female respectively. The result reveals that body measurements can be better selected for improvement in weight for male muscovy than for females.
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