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Articles by K. J. Peters
Total Records ( 2 ) for K. J. Peters
  D. Tadelle , Y. Alemu , D. Nigusie and K. J. Peters
  Grass pea is a widely available grain legume that contains a neurotoxin ODAP that has negative effects in humans and animals. Various treatment methods were tested to select methods that are more effective. Socking and cooking at 60, 75, 90oC and boiling temperatures were found to be relatively effective. Diets containing grass pea prepared using these methods along with diets that contained untreated grass pea and a control that did not contain any grass pea were tested in a broiler trial. Grass pea was included by replacing Noug (Guizotia abyssinica) cake. Four hundred twenty unsexed one day old Cobb broiler chicks of similar body weight were divided into seven groups of 60 and further randomly sub-divided into three replicates of 20 chicks and placed in the experimental pens were used. The study showed that total replacement of Noug cake by boiled grass pea is possible without significantly reducing performance (gain and feed efficiency). Cooking at 90oC can also be considered pending economic evaluation since it was also similar results to the control diet (p>0.05) in terms of feed efficiency. Performance of broilers on the rations containing grass pea treated using the other methods seem to have depressed performance too much. Comparison of performance during the starter and finisher phases indicates that most of the depressing effects seem to have occurred during the starter phase. There was no visible sign of lathyrism in any of the treatment groups in this study. It is suggested that further economic analysis of using the methods be conducted. Further work on the possibility of using grass pea only during the finisher phase following the apparent reduction of the negative impacts of feeding grass pea at this stage observed in this study is also proposed.
  D. Tadelle , C. Kijora and K. J. Peters
  Growth performances and feed utilization potentials of six chicken populations were investigated at Debre Zeit Agricultural Research Centre, Ethiopia. Five local ecotypes originated from different Agro-ecologies and corresponding market sheds in Ethiopia, namely, Tilili, Horro, Chefe, Jarso, Tepi, and the Fayoumi breed was used as a reference breed. Ecotype had a significant (p<0.01) effect on overall body weight gain per bird and mean body weight gain per bird per day from day old to 12 weeks of age. The highest body weight gain per bird was recorded for Fayoumi chicks. The Fayoumi chicks were 11.9, 97.7 and 49.4% heavier than chicks from Chefe (heaviest locals at this age) ecotype, Jarso (least total body weight gain among the locals at this age) ecotype and mean daily gain of all local ecotypes, respectively at six weeks of age. Chefe chicks ecotypes showed 76.8% positive deviation over chicks from Jarso market sheds in terms of total body weight gain per bird at this age. The Fayoumi chicks consumed 41, 115 and 65% more feed than chicks from Chefe ecotype (highest body weight gain and feed intake among locals at this age), Jarso ecotype (lowest body weight gain and least feed intake among the locals at this age) and the mean feed intake of all local ecotypes, at six weeks of age, respectively. Among the local ecotypes, Jarso and Tepi had the smaller body weight gains while Chefe and Tilili had larger weight gains. The result from the analysis of variance showed a highly significant (p<0.001) difference on body weight gain per bird, average body weight gain per bird per day, feed intake per bird, average feed intake per bird per day and feed conversion ratio (feed: gain) among the different ecotypes and sex from six to 12 weeks of age. The highest body weight gain per bird and mean daily body weight gain per bird per day among the locals were recorded for Tilili growers. The Fayoumi chicks were 28, 77 and 52% heavier than chicks from Tilili ecotypes (heaviest locals at this age), Tepi ecotypes (least total body weight gain among the locals at this age) and mean body weight gain of local birds, respectively. Male growers from Tilili ecotype (heaviest locals at this age), Tepi ecotype (least total body weight gain among the locals at this age) and mean body weight gain of local birds, were 22, 30 and 33% heavier in body weight gain per bird over female chicken at twelve weeks of age, respectively. Feed conversion ratio was also significantly (p<0.01) affected by ecotypes. The highest feed requirement per unit gain was recorded for the Fayoumi chicks followed by chicks from Tepi and Horro chicks and the lowest feed requirement per units of gain was recorded for Tilili and Chefe chicks with feed conversion ratio of 4.95g and 5.2g feed per unit of gain, respectively.
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