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Articles by C.B.A. Wollny
Total Records ( 2 ) for C.B.A. Wollny
  T.N. Gondwe and C.B.A. Wollny
  The growth potential of local chickens in Malawi was evaluated by comparing their growth performance under cage-fed and free-range management conditions. Chicks (n = 106) were collected from 39 farmers in 19 villages and individually raised in cages from an average age of 9 weeks to 20 weeks. On-farm made growers mash (17% CP) was fed and birds were treated against common diseases and parasites. Hatch mates (n = 141) of cage-raised chicks remained on farmer household flocks and were raised by their dam hens under scavenging conditions. These birds were raised in two batches between October and December 2002, and between January and March 2003, which were corresponding with hot-dry and warm-wet seasons, respectively. Sex of chickens, village, management and management x batch interaction significantly (p<0.05) influenced growth traits. The values for birds under cage-managed conditions were significantly (p<0.05) 27, 39, 42, 25 and 41% higher than for birds under scavenging conditions, for weight at 20 weeks, overall daily weight gains, specific growth rate and growth efficiency, respectively. Phenotypic variance for daily weight gains and specific growth rates were 17 and 21%, respectively lower for cage-fed than for free range birds. Correlation coefficients of growth traits measured between cage-fed and scavenging conditions were low (r = 0.21-0.53, p<0.05), indicating possible genotype by environment interaction. Gross margin over feed costs was MK26.00 per bird (SD, MK27.00). This was 35% rate of return on feed costs (SD = 38%) or 24% rate of return on initial bird value plus feed cost (SD = 26). It is concluded that growth potential of local chickens is only partially exploited under scavenging conditions primarily due to feed constraints.
  Ngo Thi Kim Cuc , F.C. Muchadeyi , H. Eding , S. Weigend , C.B.A. Wollny and U. Baulain
  The objective of the study was to assess genetic diversity of H`mong chickens, a local breed in the mountainous areas of Northern Vietnam. Structured questionnaires were administered to fifty-five households from three villages (Phieng Cam (n = 30), Chieng Chan (n = 15) and Chieng Noi (n = 10). Morphological characters of 773 chickens were physically examined. Flock sizes averaged 14.44 ± 7.38 chickens per household. Seventy percent of the chickens had predominantly brown and multicoloured plumage. Yellow skin (94%) dominated over black skin colour. Ninety-five percent of the chickens had black legs. Ninety-six percent had black versus yellow beaks. Single comb prevailed with a frequency of 94%. Body weight of adult chickens averaged 1617g (± 52). Hens laid 12–13 eggs per clutch, with an average egg weight of 41 g. Hatching rate was more than 80%. The chickens were reared under a semi-scavenging production system in which 85% of the households provided chicken housing. All farmers supplemented their chickens with whole maize at most twice per day. A subset of thirty-six chickens from the three villages was genotyped at 29 microsatellite loci. A total of 186 alleles were observed. The mean number of alleles was 6.41 per locus. Heterozygosity varied from 62.7% to 66.8% for the three populations. All the village based populations were in Hardy-Weinberg equilibrium and were not affected by inbreeding. Pair wise FST indicated a significant (P< 0.05) differentiation between the Chieng Chan and the other two populations. The Nei`s, Reynold`s and Cavalli-Sforza distance measures showed Chieng Chang to be more distant from the two geographically close populations. There was no significant (P>0.05) genetic differences among the plumage colour based populations. The highest number of identical structure runs (10 out of 100) were observed at K = 2 in which Phieng Cam and Chieng Noi chicken clustered as one population while the Chieng Chan population had some individuals partly assigned to the Phieng Cam and Chieng Noi cluster.
 
 
 
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