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Title: Grain Sorghum in Chicken Diets - Effects of Tannin level and Tannin Binders on Broiler and Layer Performance
Authors: Ambula, Mary Kivali
Keywords: Grain Sorghum -- Chicken Diets -- Tannin Level -- Tannin Binders -- Broiler -- Layer
Issue Date: Sep-2002
Publisher: Egerton University
Abstract: The following study was designed to explore the possibility of using some of the indigenous sorghum cultivars grown in Kenya as alternative energy sources in chicken diets. The efficacy of polyvinylpyrrolidone (PVP) and bentonite when used at 0.25% and 0.5% to minimize the deleterious effects of tannins was also studied. Experiment l involved a 3-week feeding trial and investigated the effects of PVP when used at 0.25% and 0.5% on the utilization of high tannin sorghum (HTS) by broiler chicks. In experiment Z the effects of sorghum inclusion level on dry matter digestibility (DMD), nitrogen (N) retention and tannin absorption were studied in a 3-week substitution assay. Experiment 3 was designed to study the effects of bentonite when used at 0.25% and 0.5% on the utilization of HTS by laying hens. ln experiment 4 the effects of sorghum inclusion level on the performance of laying hens were investigated. The results of the first broiler experiment showed that diets based on maize, white sorghum and cream sorghum gave similar body weight gains and all were better (P<0.05) than light brown or dark brown sorghum-based diets. Similarly, feed efficiencies were better (P<0.05) for diets 1, 2 and 3 compared to diets 4, 5, 6 and 7. When 0.25% PVP was added to the HTS diet (diet 5) there was-no significant improvement in chick performance (P>0.05). However, the addition of 0.5% PVP resulted in significant improvement (P<0.05) in body weight gain compared to the untreated dark brown sorghum. Overall, PVP did not completely overcome the deleterious effects of tannins. The results of the second broiler experiment showed that sorghum inclusion level had no effect (p>0.05) on feed efficiency, weight gain, DMD and N retention. The results of experiment 3 showed that white sorghum (low tannin sorghum diet) supported better performance for all variables measured. Treating high tannin sorghum with 0.25% or 0.5% bentonite did not significantly improve the performance of the hens. The results of experiment 4 showed that sorghum inclusion level had no effect on layer performance. When all the results are taken together it is concluded that in diets with adequate energy and protein, tannin levels in the range of 2.7-3.2% CE have no adverse effect on broiler and layer performance. The use of PVP or bentonite to deactivate sorghum tannins is not necessary.
Appears in Collections:Faculty of Agriculture

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