T WO hundred 42 days old Shaver Star-cross pullets were subjected to five dietary treatments comprising of a commercial pullet feed alone and commercial pullet feed diluted with two levels of copra meal (CM) at two levels (200 and 300g/kg) with or without Challenzyme. Data were collected on growth performance (feed intake, weight gain and feed conversion ratio) fora period of 84 days (42-126 days). Results showed no significant difference between supplemented and control groups in growth performance across the dietary treatments at (P > 0.05). Cost of the kg feed was linearly reduced on the dilution diets but feed cost per unit live weight gain was not different among the treatments (P > 0.05). In conclusion, diluting commercial feed with CM up to 300g/kg does not compromise pullet performance during the growing period. These findings will reduce cost of pullet rearing and add value to copra meal in coconut producing regions. There is need for more research into higher rates of dilution, composition of basal diet, enzyme source and inclusion level.
Context
Dilution of commercial feed with moderate levels of copra meal (CM), a byproduct of coconut oil extraction, was shown to maintain broiler performance in older breeds, but reports on its use in modern fast-growing broilers are limited.
Aims
We evaluated feed dilution with CM and enzyme supplementation in broiler chickens. We hypothesised that (i) diluting commercial feed with CM will maintain performance of modern fast-growing broilers, and (ii) enzyme supplementation will improve utilisation of the diluted diets.
Methods
Experiment 1 studied the performance of growing broilers (10–21 days of age) fed commercial grower diet alone (control), or diluted with one of two levels of CM (50 and 100 g/kg) and with or without enzyme supplementation. Cobb 500 broiler chicks (10 days old), 200 in total, were assigned to five dietary treatments with four replicates, in a completely randomised design. Experiment 2 investigated higher levels of dilution (100 and 200 g CM/kg) and enzyme supplementation of commercial finisher diet in 200 finishing broilers (22–42 days of age) assigned to five treatments with four replicates each.
Key results
In Experiment 1, feed intake was reduced (P < 0.05) on the 100 g CM/kg diet without enzyme compared with 50 g CM/kg without enzyme and both of the enzyme-supplemented diets but was not different (P > 0.05) from the control. Bodyweight gain and feed conversion ratio were not affected (P > 0.05) by dietary treatment. In Experiment 2, feed intake was reduced on 200 g CM/kg with enzyme but did not differ (P > 0.05) among the control and other CM-based diets. Bodyweight gain (P < 0.05) was reduced on the 200 g CM/kg diet without enzyme compared with the 100 g CM/kg diet without enzyme. Feed:gain was not affected (P > 0.05) by diet. The relative weight of carcass and cuts, gut segments and annex organs was not affected (P > 0.05) by diet.
Conclusions
Diluting commercial grower and finisher diets with 50 and 100 g CM/kg has no adverse effects on performance of modern broilers. At higher levels of dilution (100 and 200 g/kg), enzyme supplementation may be required.
Implications
These findings will reduce the cost of broiler production and add value to CM in coconut-producing regions. We recommend more research into higher rates of dilution, sources of CM, and enzyme sources and levels that might improve performance and reduce cost of production.
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