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Articles by A. Yakubu
Total Records ( 5 ) for A. Yakubu
  A.O. Ladokun , A. Yakubu , J.R. Otite , J.N. Omeje , O.A. Sokunbi and E. Onyeji
  Haematological and serum biochemical indices of Nigerian indigenous chickens of two genetic groups were evaluated. One hundred and twenty (120) cocks with average weight of 1.10kg, corresponding to sixty (60) naked neck (NaNa) and sixty (60) normally feathered (nana) were utilized in the study. On the basis of feather colour, the normal plumage cocks were subdivided into two equal phenotypic groups. Each genetic group was divided into four replicates of fifteen birds each in a completely randomized design. There were no significant (P>0.05) differences between the genotypes in the mean values of white blood cells(WBC), mean corpuscular volume(MCV), mean corpuscular haemoglobin concentration(MCHC). However, naked neck cocks were significantly superior in packed cell volume (PCV) haemoglobin (Hb) and red blood cells(RBC) compared with their normally feathered counterparts(41.00 vs 35.90%; 13.68 vs 11.60 g/dl; 4.84 vs 4.21x106/ml; p>0.05). With the exception of PCV which was significantly (p>0.05) higher in brown cocks than white coloured cocks (38.30 vs 33.50%), plumage colour had no significant effect on the variables estimated. No significant differences were observed in total protein, albumin, urea, glucose, cholesterol, serum alanine amino transaminase (SALT) and serum aspartate amino transferase (SAST) of the genetic groups. The normally feathered cocks, however had significantly (P<0.05) higher globulin content (1.53 vs 1.15 g/dl) and lower creatinine value (0.88 vs 0.95 mg/dl) compared to the naked neck cocks. Plumage colour did not significantly (P>0.05) affect serum biochemical parameters suggesting that the two colour variants might not be true representation of genetically distinct subpopulations. The present result on blood parameters of both naked neck and normally feathered cocks could serve as a baseline data, which could be exploited in the improvement of local stock.
  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.
  A. Yakubu , A. E. Salako and A. O. Ige
  An experiment was designed to study the effects of genotype and housing system on the performance of two commercial layers, Bovans Brown and Lohmann Brown in the hot-dry and wet seasons in Lafia, Nasarawa State, Nigeria. Six hundred, 27 week-old layers were used. One hundred and fifty birds of each strain were randomly assigned to the battery cage system, while another one hundred and fifty birds of each strain were managed on deep litter. The observation for the hot-dry and wet seasons lasted 2 months each respectively in the year 2004. Body weight, hen-housed egg production, egg weight and mortality rate were significantly better in Lohmann Brown than Bovans Brown (1.75±0.01kg vs. 1.69±0.01kg, 74.50±0.84% vs. 68.72±0.86%, 53.70±0.24g vs. 52.43±0.26g, 0.58±0.09% vs. 1.20±0.15%; p<0.05). Birds in cages were superior to those on deep litter in terms of hen-housed egg production, egg weight and mortality (74.06±0.75% vs. 69.16±1.02%, 53.40±0.24g vs. 52.73±0.29g, 0.68±0.10% vs. 1.10±0.15%; p<0.05). Generally, birds performed better in the wet than hot-dry season in body weight, hen-housed egg production, feed intake, egg weight, egg cracks and mortality (1.76±0.01kg vs. 1.68±0.01kg, 74.92±0.74% vs. 68.30±0.86%, 98.51±0.50g vs. 90.90±0.23g, 53.92±0.18g vs. 52.22±0.27g, 1.99±0.23% vs.5.12±0.39%, 0.55±0.08% vs. 1.22±0.15%; p<0.05). The interactions between genotype×housing system, genotype×season and housing system×season produced significant results. Proper housing design, provision of quality and adequate feeds and proper timing of the laying period were recommended.
  A.O. Ige , A.E. Salako , A. Yakubu and S.A. Adeyemi
  Qualitative traits characteristics of indigenous Chickens in derived savannah Zone of Nigeria were studied. A total of two thousand and forty one (2,041) indigenous chickens comprising 1274 Yoruba Ecotype Chickens (YEC) and 767 Fulani Ecotype Chickens (FEC) were sampled for the study. Traits studied included Sex, Comb Size, Wattle Size, Comb Type, Ear lobe Colour, Feather Structure, Plumage and Comb Colour. The result indicated that female chickens dominated the two Ecotypes with 52.04% in YEC and 52.28% in FEC. Highest percentage of Large Comb Size was observed for male chicken in both ecotypes: 67.57% in YEC and 71.32% in FEC. Three types of wattle size were observed in the two populations (Small, Medium and Large). Proportion of Large Wattle size favoured male chickens (YEC: 51.13%, FEC: 49.38%) in both populations. Three different types of comb (Single, Rose and Pea) with Single Comb type dominant over others (94.29% in YEC and 80.44% in FEC). Three colour patterns of ear lobe were observed in YEC with White Ear Lobe (69.07%) dominated the population while five colour patterns were observed in FEC with Red Ear lobe (74.97%) dominated. Three feather structure (Normal, Frizzled and Naked Neck) pattern were observed in the two populations, Normal type had the highest percentage (YEC: 83.99%, FEC: 83.05%). Plumage colour varied widely, six different types were observed in YEC and mixed colour had the highest percentage (31.4%) followed by dominant black (25.69%) while Eight different types of plumage colour were observed in FEC in which black colour (31.55%) had the highest percentage. The study revealed a wide variation in some of the traits, therefore future study can be concentrated on selection for qualitative traits of interest.
  A. Yakubu , A. E. Salako , A. O. Ladokun , M. M. Adua and T.U. K. Bature
  Effects of feed restriction on performance, carcass yield, relative organ weights and some linear body measurements were investigated in weaner rabbits in a sub-humid environment in north central Nigeria. Twenty four weaner rabbits of mixed breeds and sexes with an average initial weight of 804.17±71.20g were used for the study which lasted six weeks. There were three dietary treatments consisting of diet A, ad libitum (24 hrs) feeding (control), diet B, 8 hrs per day feeding (7.00 a.m-3.00 p.m) and diet C, skip-a-day feeding. This feeding arrangement was carried out within the first five weeks of the experiment, after which all the animals in the three treatment groups were fed ad libitum for one week. Animals were fed pelletized commercial grower`s feed supplemented with Centrosema pubescens. Drinking water was also supplied ad libitum throughout the duration of the experiment. Each treatment group was replicated four times while each replicate comprised two rabbits housed in the same cage. The initial and final body weights, feed conversion ratio, mortality, fasted weight, slaughter weight, carcass weight and dressing percentage were not significantly (p>0.05) affected by feed restriction. However, average weekly feed intake (454.94, 356.36 and 331.48g) and average weekly body weight gains (1137.50, 1127.50 and 1007.50g) were significantly (p<0.05) influenced; with higher values recorded among rabbits fed   ad libitum compared to those on 8 hrs feeding per day and skip-a-day feeding respectively. There were no significant differences (p>0.05) in relative weights of liver, kidneys, spleen and heart among the treatment groups. Significant difference (p<0.05) was found in the relative weight of lungs, with rabbits on 8 hrs feeding per day and those on skip-a-day feeding having an edge over those fed ad libitum (0.61 versus 0.50). There were no significant differences (p>0.05) in heart girth, body length, face length and ear length among the dietary treatments studied. The present results have indicated that feed restriction could be exploited in the feeding regimen of rabbits, especially in periods of inadequate supply of concentrates and forages.
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