Performance of broilers fed rations containing canola meal
1998
Mateo, C.D. Jr. | Centeno, J.R. | Carandang, N.F. (Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Animal Science)
A total of 490 male day-old Arbor Acre broiler chicks were used to demonstrate the effects of different levels of canola meal (CM) at 5 percent, 10 percent, and 15 percent with and without electrolyte balance adjustment as feed supplements in a typical corn-soy diet. There were seven dietary treatments with seven replicates per treatment and ten birds per replicate. All diets were isocaloric and isonitrogenous and fed in mash form ad libitum for 42 days. The calculated nutrient analysis of the starter diet fed from 1 to 21 days was: 21.5 percent crude protein (CP); 3000 kcal ME [metabolizable energy]/kg; 1.10 percent digestible lysine, and 0.70 percent digestible methionine + cystine. The grower diet fed from 22-42 days contained 19.5 percent CP, 3000 kcal ME/kg; 0.95 percent digestible lysine; and 0.61 percent digestible methionine + cystine. The canola meal used in this study came from Canada and contained 36.07 percent CP, 1.8 percent crude fiber and 3.46 percent crude fat on as basis. The growth performance of the birds was measured at 3 weeks (starter period) and 6 weeks (grower period). In general, the live body weights of broiler decreased as the level of CM was increased in the diet. In the starter period, there was a 7.66 percent and 8 percent (P less than 0.05) drop in weight gain in two 15 percent CM groups. In the total experiment, growth depression was highest in birds given the 15 percent CM with and without electrolyte balance adjustment and the 10 percent CM with no electrolyte balance adjustment. Birds given the 15 percent CM with and without electrolyte balance adjustment exhibited the lowest feed consumption with 5.38 percent and 4.16 percent drop, respectively. Feed efficiency was not improved in all treatments that contained CM except for birds that received a diet with 10 percent CM with electrolyte adjustment. Efficient feed utilization was observed in birds given the 10 percent CM during the two growth periods and the entire duration of the experiment. These birds had higher feed efficiency by 4.08, 0.96 and 1.71 percentage points compared with the control group during these periods. An economic analysis resulting from feeding the different diets showed that income was highest in birds that received 10 percent CM (P0.41/kilo liveweight advantage) and the lowest in birds that received 15 percent and 10 percent CM where the electrolyte balance was not adjusted
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