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Matching Livestock Systems with Available Resources |
MEKARN Regional Conference 2007 |
Effect of two types (sun-drying before and after 40 days ensiling) with 3 supplementation levels of cassava residue meals (CReM) in diets was investigated in 280 Luong phuong broiler chickens from 28 to 84 days old. The experiment included seven groups, in which one group fed control diet, three pair-feeding groups given sun-dried fresh and ensiled CReM at low, medium and high level. All the diets were balanced in nitrogen, lysine, methionine + cysteine content corresponding to requirement of growing and finishing Luong Phuong broilers. The contents of crude protein and crude fibre (% of dry matter) in samples of sun-dried meals from fresh and ensiled cassava residue were not different from those in samples of fresh and ensiled cassava residue, respectively.
There was no effect of type of meals on growth performance and carcass traits or broilers at 84 days old. Supplementation of CReM at low and medium level (10-15% and 15-20% corresponding to growing and finishing diets) did not affect growth rate and feed conversion ratio. Supplementation up to 20 and 25% in growing and finishing diets had the highest economic efficiency but reduced carcass traits. Carcass, breast muscle and leg muscle percentage was lowest in the groups fed high level of CReM, in contrast abdominal fat percentage was decreased with increase of CReM in the diets. There were no differences between groups in CP and EE content in leg muscle.