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Articles by G.N. Egbunike
Total Records ( 3 ) for G.N. Egbunike
  L. Bratte , I.A. Amata , S.I. Omeje and G.N. Egbunike
  In an investigation conducted to determine the effect of utilizing seeds of the African Pear (Dacryodes edulis G. Don, H.J. Lam) as a feed ingredient in the diets of broiler breeders on semen characteristics, 25 adult Anak Titan breeder cocks aged 20 weeks were randomly allotted to five dietary treatments of 5 cocks per treatment and fed diets in which Dacryodes edulis seed meal (DESM) replaced maize at 0% (control), 15, 30, 45 and 60% for 8 weeks. After 2 weeks of feeding the experimental diets, semen was collected twice weekly from the cocks by the lumbar massage technique. Semen colour or consistency scores were significantly lower for cocks which received the control and 15% DESM diets than for cocks on the 45 and 60% DESM diets. Mean semen volume was significantly (p<0.01) higher in cocks fed with 15, 30 and 45% DESM (0.33, 0.37 and 0.35 mL, respectively) than in those which received the control diet (0.21 mL) and in those fed 60% DESM (0.19 mL). Sperm concentration (x106 mL-1) generally increased significantly (p<0.01) as the level of DESM in the diet was increased. Negative but non-significant (p>0.05) correlations existed between body weight and sperm motility, semen pH, ejaculate volume, sperm concentration and percent live sperm while body weight bore a positive (but non-significant) correlation with percent abnormal sperm and a highly significant (p<0.01) positive correlation with semen consistency (0.99). It was concluded that DESM had no adverse effect on semen quality of broiler breeders even if it replaced as much 45-60% of dietary maize in broiler breeder diets.
  Eme E. Orlu and G.N. Egbunike
  Due to the hostile climatic environment of the humid tropics characterized by high ambient temperature and humidity all year round, this study was initiated to evaluate the effect of breed and season on the testicular histometric and cellular populations of the domestic fowl. Testes obtained from forty sexually matured cocks consisting of 20 barred Plymouth Rock (bPR) and 20 non-descript Nigerian Indigenous Breeds (NIB) were processed by histological and histometric methods. Volumetric proportions of testicular germ cells remained unaffected by breed or season. Seminiferous tubules occupied 83-87% of the testicular mass in NIB and bPR, respectively. Nuclear diameter of the germ cells and their volumes remained unaffected by breed and season. The mean seminiferous tubule diameter (248.56±12.56 vs. 212.93±9.39 μm) and the seminiferous tubule length/paired testes (221.13±12.59 vs. 133.73±4.52 m) were significantly (p<0.01) influenced by breed with the bPR having the higher values, the mean seminiferous tubule length/g of testicular parenchyma remained unaffected by breed or season. Sertoli Cell Index showed a linear relationship with the testes weight characterized by the equation Y = 0.163x + 1.733, r = 0.9000, R2 = 0.81 (p<0.001). Similar significant (p<0.001) relationships occurred between seminiferous tubule length (r = 0.8651 (p<0.001) ,seminiferous tubule diameter (r = 0.7658, p<0.001), volume % round spermatids (r = 0.9904, p<0.001), testicular parenchyma volume (r = 0.9073, p<0.001) and volume % of seminiferous tubule(r = 0.5474, p<0.001). These parameters can be predicted from testicular weights and testicular histometry provides a reliable tool for the assessment of the reproductive state and potential sperm production capacity in the domestic fowl.
  Eme E. Orlu and G.N. Egbunike
  The daily spermatozoa production was studied in 20 each of sexually matured barred Plymouth Rock and Nigerian indigenous breeds of domestic fowl using both the histometric and testicular homogenate methods. The exotic cocks were significantly (p<0.01) heavier than the locals with the respective values of 2.11±0.05 and 1.58±0.02 kg. The exotic also had larger (p<0.01) gross testicular weight (21.58±1.46 vs. 12.56±0.91g), paired testicular parenchymal weight (20.47±0.40 vs. 11.96±0.82 g) and paired tunica albuginea (1.11±0.18 vs. 0.60±0.11 g). The total length and the diameter of the seminiferous tubules were also significantly influenced (p<0.01) by breed. The volume percent occupied by seminiferous tubules though higher in the exotic birds showed no statistical significance. Daily sperm production obtained from histometric method was highly influenced by breed with 2.41±1.17x109 and 0.76±0.71x109 for exotic and local cocks, respectively. The daily sperm productions calculated on the basis of homogenization-resistant spermatids were 1.85±0.22 for exotic and 0.73±0.11 for locals. Although, the difference in DSP values based on both methods was not statistically significant there was a 23.24 and 3.90% loss in exotic and local birds respectively with the use of homogenization method. On the whole, the exotic cocks were twice as efficient in sperm production as the local birds.
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