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Articles by C.E. Wani
Total Records ( 2 ) for C.E. Wani
  N.M. Eltayeb , C.E. Wani and I.A. Yousif
  This study was designed to evaluate broody behavior and its effect on some production traits and the plasma prolactin hormone levels during production, incubation and rearing periods in the native chicken of the Sudan. Two stocks of dwarf (Betwil) and bare neck chicken ecotypes constituting 270 pullets were used in this study. The experimental birds were housed in floor breeding pens individually and the exhibited characteristics of broody behavior were closely observed and recorded on daily bases. Feed intake during broody and non broody periods was recorded. The effect of chicks rearing and egg accumulation in the nest as some managerial practice on broody cycle and hence egg production were also studied. Ninety blood samples representing production, incubation and rearing stages were collected from randomly selected hens (45 for each ecotype) to evaluate prolactin hormone levels and its association with the onset of broodiness. The results indicated that 86.6% of the betwil ecotype exhibited persisted broody behavior in all the measured stages compared to 55.5% for bare neck ecotype in which the signs of broody behavior were observed to be relatively mild compared to those in betwil ecotype. Depriving hens from chicks rearing resulted in significant reduction of broody cycle days. Broodiness significantly affected feed intake and egg production. The average blood prolactin level was found to be significantly (p<0.01) higher in betwil than in bare neck ecotype during the incubation and rearing periods. The highest prolactin level was recorded during incubation period in both ecotypes whereas the lowest was found during rearing period. It was concluded that broodiness can be alleviated by managerial practice to improve egg production potential of the local flock.
  S. Ommeh , L.N. Jin , H. Eding , F.C. Muchadeyi , S. Sulandari , M.S.A. Zein , G. Danbaro , C.E. Wani , S.G. Zhao , Q.H. Nie , X.Q. Zhang , M. Ndila , R. Preisinger , G.H. Chen , I.A. Yousif , K.-N. Heo , S.J. Oh , M. Tapio , D. Masiga , O. Hanotte , H. Jianlin and S. Weigend
  An A/G Single Nucleotide Polymorphism (SNP) at position 1,892 of the Mx gene coding sequence has been linked to susceptibility/resistance to avian viral infection in vitro. Using PCR-RFLP and sequencing methods, 1,946 samples from 109 populations from Asia, Africa and Europe; grouped as indigenous village, commercial, fancy chicken as well as wild junglefowl were genotyped for the polymorphism. Allele and genotype frequencies were calculated. Only the G allele was present in Ceylon junglefowl Gallus lafayetti. Using the wild red junglefowl G. gallus population as reference, we assessed if the A/G alleles and genotypes frequencies have been affected by the breeding history and the geographic dispersion of domestic chicken. Within group variation was high but overall there were no significant variation in distribution of alleles and genotypes frequencies between the red junglefowl and indigenous village chickens (p>0.1946), with the exception of the East Asian group (p<0.0001). However, allele and genotype frequencies were significantly different between the red junglefowl and the commercial or fancy groups (p<0.0001). A small but significant negative correlation (r = - 0.166, p<0.0003) was observed between allelic and geographic distance matrices amongst indigenous village chicken populations. Human selection and genetic drift are likely the main factors having shaped today’s observed allele and genotype frequencies in commercial and fancy breeds. In indigenous village chicken and red junglefowl, we propose that both A and G alleles have been maintained by natural selection for disease resistance through a balancing selection mechanism.
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