The Influence of Residual Linamarin in Dried Cassava Peel Meal on Carcass Yield and Gut Characteristics of Weaner Rabbits

Abstract

A feeding trial was conducted to assess the effects of residual linamarin on carcass yield and gut characteristics of rabbits fed diets containing sun dried cassava peel meal (CPM). The experiment was conducted using a completely randomized design involving four diets of 16% crude protein. The CPM was included at 0, 30, 35 and 40% levels. Rabbits used for the studies were fed for 42 days and were all serially slaughtered fortnightly. During each slaughter, two rabbits were randomly selected, starved overnight and slaughtered. They were skinned, eviscerated and the carcasses cut up into parts and weighed. The guts were separated into; small intestine, large intestine, caecum and appendix. Each of the visceral parts were weighed and their length recorded. The results showed that chest and back were significantly (P<0.05) affected by dietary treatments. Also the carcass yield obtained over time of slaughter indicated a significant (P<0.05) effect on the weight of the back. The time of slaughter x diet interaction effect showed no significant difference on all parameters. The results of the guts showed that, dietary influence were only obtained on the weights of the caeca (P<0.001) and appendix (P<0.05). There were significant diferences on the  weights of large intestine (P<0.05), caeca (P<0.01) and appendix (P<0.001) over the period of slaughter. There is also a highly significant (P<0.001) difference in the length of the caeca. The results of the interaction effect on time of slaughter x diet for all the visceral parts (guts) measured showed a highly significant (P<0.001) interaction effect on the weight of the caeca and that of the small intestine (P<0.05). The studies indicated that despite sun drying, linamarin, a cyanogenic glucosides still has some potential toxic effects as manifested on the carcass yield, large intestine, caeca and appendix. It is thus, suggested that prolonged feeding of CPM must be investigated to safeguard against poisoning. It might also affect caecotrophy in the caeca and the absorption of nutrients in the appendix.

Keywords: Linamarin, gut characteristics, dried cassava peels, rabbits