ion of soybean meal in the diets and the effect on broiler performance. A total
number of two hundred Lohmann MB 202 Platinum broiler chickens were kept in five
weeks rearing period, consisted of three weeks of starter phase (0-3 weeks) and two weeks
of finisher phase (3-5 weeks). This study used a completely randomized design with four
treatments and five replicates. The dietary treatments were: JB0-0 (control ration: basal
diet without jack bean meal substitution in starter and in finisher phase), JB50-0 (basal diet
with jack bean meal substitution in starter phase only), JB50-50 (basal diet with jack bean
meal substitution in starter and in finisher phase), JB0-50 (basal diet with jack bean meal
substitution in the finisher phase only). The data obtained were statistically analyzed using
analysis of variance and followed with Duncan's multiple-range test for the data with
significant difference. The variables measured were: growth performance, carcase yield,
visceral organ weight and immune organ. Results showed that the dietary treatment had
no effect on performance, carcass yield and commercial cut, visceral organ or immune
organs of 35 days old broiler chickens, except for the thymus (P