Economics and effect of replacing wheat offal with cassava peel meal on growth performance, nutrient digestibility of growing pigs

Abstract

This study was carried out to determine the feeding value of Cassava Peel Meal (CPM) as replacement for wheat offal in growing pigs’ diets. Five treatment diets were formulated by replacing wheat offal with CPM at 0, 25, 50, 75 and 100% for treatments T1, T2, T3, T4 and T5, respectively. A total of 75 growing pigs of large white breed were allotted on weight equalization basis into the five dietary treatments with 15 pigs per treatment and 3 pigs per replicate in a completely randomized design. The pigs were allowed to acclimatize for two weeks before the commencement of the study which lasted for 14 weeks. Results indicated that wheat offal contained 16.25% crude protein (CP), 18.86% crude fibre (CF) and 1.18% ether extract. The values were higher than cassava peel meal’s 5.18% CP and 15.18% CF and was lower than 1.99% ether extract. The 25, 50, 75% CPM significantly (p<0.05) increased final live weight, daily weight gain and feed conversion ratio compared to 100% CPM. There was no significant (p>0.05) difference in feed intake. Total feed cost/Kg, feed cost/Kg weight gain and returns on investment significantly (p<0.05) decreased as the levels of cassava peel meal increased in the diets. The bled, scalded, eviscerated and dressed weights decreased as the level of CPM increased in the diets. The heart weight increased with the CPM level, while the liver and the kidney decreased with increase in CPM in the diets. Blood glucose and cholesterol increased with increasing levels of cassava peel meal in the diets while albumin and creatinine decreased as the level of cassava peel meal increased in the diets. The packed cell volume (PCV), haemoglobin (Hb) and red blood cell (RBC) counts decreased (p<0.05) as the level of cassava peel meal increased in the diets. White blood cell (WBC) and lymphocyte values were highest for pigs in T3 (50%) and T4 (75%). The study concluded that cassava peel meal could replace 75% of wheat offal in growing pig diets without deleterious effects on growth performance and economic benefit in terms of total feed cost, cost per kilogram and weight gain. Key words: Blood serum, cassava peel, carcass, haemotology, returns on investment