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Articles by G.N. Akpa
Total Records ( 5 ) for G.N. Akpa
  P.P. Barje , O.W. Ehoche , L.O. Eduvie , A.A. Voh Jr , G.N. Akpa and O.S. Lamidi
  A study was carried out to determine the effects of varying levels of whole cottonseed on feed intake, weight gain and blood parameters in FriesianxBunaji and Bunaji heifers. Twenty FriesianxBunaji and 24 Bunaji pre-pubertal heifers were divided to 4 groups of 5 and 6 animals/group. Animals in each group were fed 1 of 4 experimental concentrate diets containing 0, 25, 50 and 75% whole cottonseed for 140 days. The result of the study showed that concentrate intake declined with increase in the level of whole cottonseed in dieting averaging 4.2, 3.3, 3.1 and 2.9 kg head -1day -1 in FriesianxBunaji fed 0, 25, 50 and 75% whole cottonseed diets, respectively. The corresponding intake figures for the Bunaji heifers were 3.1, 2.9, 2.5 and 2.2 kg head -1 day -1. Mean daily weight gain were 0.59, 0.59, 0.48 and 0.64 kg in FriesianxBunaji and 0.48, 0.41 and 0.50 C kg in Bunaji heifers fed 0, 25, 50 and 75% whole cottonseed levels, respectively. Changes in blood parameters were not significant in both FriesianxBunaji and Bunaji heifers across treatments. The study showed that heifers could be fed diets containing up to 75% whole cottonseed, respectively without adverse effects.
  P.P. Barje , O.W. Ehoche , L.O. Eduvie , A.A. Voh Jr. and G.N. Akpa
  Twenty Friesian x Bunaji crossbred and twenty-four Bunaji prepubertal heifers were fed 4 diets containing 0, 25, 50 and 75% whole cottonseed to determine effect of varying the level whole cottonseed on onset of puberty, response to oestrus synchronization with PGF and artificial insemination. The animals were fed the diets for 140 days. At the end of the feeding trials, oestrus synchronization was carried out on all the animals using PGF, injected intramuscularly in 2 doses of 2 mL each given 13 days apart. Compared to animals on the control diet (0% whole cottonseed diet), there was a slight delay in onset of puberty (age at first detection of palpable ovarian structures and first oestrus) with inclusion of whole cottonseed in the diet. Following oestrus synchronization with PGF, interval from treatment to onset of oestrus increased. Compared to the animals on the control diet, oestrus response rates, oestrus activities (vis-à-vis number of mounts) and heat duration declined significantly (p<0.05) in both Friesian x Bunaji and Bunaji heifers with increasing level of whole cottonseed in the diet. Level of whole cottonseed had no effect on conception rates of Friesian x Bunaji heifers. However, there was significant decline in pregnancy rates of animals fed 25, 50 and 75% whole cottonseed diet compared to the control (averaged pregnancy rates = 100, 80.3, 40.2 and 80.3% for the Friesian x Bunaji and 66.7, 50.0, 50.0 and 50% for the Bunaji on 0, 25, 50 and 75% levels of whole cottonseed, respectively).
  G.N. Akpa , J. Kaye , I.A. Adeyinka and M. Kabir
  Repeatability at 12, 16, 20, 24 and 28-weeks of age of egg weight, egg length, yolk weight, albumen weight, shell thickness, shell membrane thickness, albumen index, yolk index, egg index and shape index was estimated based on the first three eggs laid in the week by forty-eight Japanese quail (Coturnix coturnix japonica) pullets. The estimated repeatability for these traits was high (0.58 - 0.99) with a consistent increase in repeatability as laying age progressed. Repeatability of egg length, egg index and shape index showed a linear relationship with age, where as the remaining traits showed a curvilinear relationship. The general increase in repeatability of each trait with age indicates that fewer records would be required to adequately characterize the inherent producing ability of each quail hen for the trait as laying age progressed. Maximum repeatability estimates were observed at 28 weeks of age.
  M. Kabir , O.O. Oni and G.N. Akpa
  Three hundred and sixty-one cocks from five hatches, one week apart, were used in this study. The birds which were made up of 203 birds from strain A (male line) and 158 birds from strain B (female line) were subjected to semen collection using the massage technique. The ejaculates were then subjected to both physical and chemical evaluations for semen quality analysis. The parameters considered were semen volume, semen colour, sperm progressive motility, sperm concentration, total sperm per ejaculate, concentration of live sperm and percent abnormal sperm. Results showed that the mean values for all the parameters lie within the acceptable range reported for normal cock semen. Moderate to high heritability estimates for most of the semen traits were also observed. The least square means (±SE) for semen volume, sperm progressive motility, sperm concentration, total sperm per ejaculate and concentration of live sperm cells obtained in this study were 0.42±0.02 ml, 73.46±2.04%, 1.47±0.15x109/ml, 64.15±5.67x109/ml and 86.45±2.63%. The heritability estimates obtained were 0.55±0.03 for semen colour, 0.45±0.08 for semen volume, 0.83±0.04 for sperm progressive motility, 0.52±0.06 for sperm concentration, 0.33±0.02 for total sperm count, 0.46±0.03 for concentration of live sperm cells respectively. High and positive genetic correlations between Osborne Selection Index and semen volume, semen colour, sperm concentration as well as with concentration of live spermatozoa were also obtained. The lowest value (0.008±0.010) of phenotypic correlation obtained was for total sperm per ejaculate and the highest value (0.066±0.027) was for semen volume. Therefore the genetic correlation between Osborne Selection Index and most semen traits were positive, hence, selection of males on the index values, currently been practiced in NAPRI, will not bring about any deterioration in semen quality. On the other hand, due to significantly negative genetic correlation between Osborne index and abnormal sperms, it will indirectly improve the semen quality of both lines which in turn may yield better fertility in the Rhode Island flock.
  M. Kabir , O.O. Oni , G.N. Akpa , I.A. Adeyinka and P.I. Rekwot
  Fifty Rhode Island chickens were randomly assigned to five treatments with ten cocks in each treatment. Group I cocks (full fed control) received 140 g of a 16% CP growers ration per cock per day. Cocks in Group II, III, IV and V received 98, 70, 42 and 28 g of the same ration per cock per day, representing 70, 50, 30 and 20% of Group I intake, respectively. The feeding trials lasted for 8 weeks during which one ejaculate per day was collected from each cock using the massage technique. The ejaculated semen samples were subjected to both physical and biochemical evaluations. Results showed that cocks that were severely underfed (i.e., Groups IV and V) took significantly longer time (p<0.01) to ejaculate. In addition, ejaculation failures were encountered more frequently with the severely underfed cocks than in cocks that were moderately underfed (i.e., Groups II and III). There were however, no significant differences in most of the biochemical parameters between cocks I all the treatment groups. Ejaculate volume, progressive sperm motility and sperm concentration were significantly depressed (p<0.01) in the severely underfed cocks than in the moderately underfed cocks. Thus, this study revealed that providing Rhode Island red and white cocks with one-half to three-quarter (i.e., 50-70%) of their normal daily ration would neither undermine their semen producing ability nor affect their semen quality adversely.
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