Chemical and nutritional evaluation of different treatments of rice polishing for use in layer rations

Study the effect of different treatments on nutritive values of rice polishing and their biological availability for laying liens. Twelve iso-caloric and iso-nitrogenous rations at 10, 20, and 30% level oh differently treated rice polishing prepared. One hundred and eight White-Leghorn layers were used for the biological trial. These were randomly divided in 4 major groups T1-T4. Each group comprised of 27 layers. Each group was further divided into 3 sub-groups having 9 layers, which were divided into 3 replicates of 3 layers each. The three sub-groups of each group were fed on ration containing 10, 20 and 30% level of rice polishing respectively. These experimental units were randomly allotted to the twelve experimental diets in such a way that there were three bird's units on each diet. The experimental diets were offered to birds throughout the experimental period of 56 days and feed consumption, feed conversion ratio, egg production, egg weight, egg shell weight, egg shell thickness and cost per dozen was recorded. The results of present study indicates that there was significant difference in feed conversion ratio, daily egg production, egg weight, egg shell weight of layer birds fed different treatments of rice polishing. The results of present study also indicate that there was significant difference in feed conversion ratio, daily egg production, egg weight and egg shell weight of layers fed on different experimental rations. It was concluded form the present study that extrusion treatment of rice polishing gave best results out of the four treatments (untreated, autoclaved, extrusion cooked and de-oiled rice polishing). Extrusion cooked rice polishing can safely be included in layer rations without any adverse effect on performance. It was also concluded that among rations, ration I (containing 30% extrusion cooked rice polishing) gave best results out of twelve rations (A, B, C, D, E, F, G, H; I, J, K and L); it also had no adverse effect on performance of layer chicks.