Abstract 196

Campbell,-LD

Dep. Animal Science, Univ. Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.

Nutrition-Reports-International. 1988, 37: 2, 371-377; 10 ref.

To study the effect of substituting rapeseed oilmeal (canola meal) for cottonseed oilmeal in wheat-based starter and finisher diets, 1400 day-old broilers were given for 45 days a control diet, or a diet with 15% cottonseed oilmeal and lysine 0, 3.75 or 4.25 mg/kcal ME (3.13 or 3.55 in finisher diets) or a diet with 15% rapeseed oilmeal and similar lysine supplementation. Body weight and feed conversion efficiency data showed that 15% rapeseed oilmeal was an effective replacement for cottonseed oilmeal, and that both rapeseed oilmeal and cottonseed oilmeal when adequately supplemented with lysine gave similar broiler performances as a maize-based soyabean meal diet. There was poor growth performance of broilers given unsupplemented diets, particularly with cottonseed oilmeal. In a further trial 1650 broilers were given control, cottonseed oilmeal or rapeseed oilmeal diets with lysine 0, 3.65, 4.05 or 4.45 mg/kcal ME (2.82, 3.06 or 3.30 in finisher diets). Optimum growth was with lysine 4.05 and 3.06 mg/kcal ME in starter and finisher diets, respectively. However, absolute requirements for lysine may be higher, especially in cottonseed oilmeal diets where lysine availability appeared to be lower.