Pakistan is occupying the eminent status in the countries: inhabiting the huge bulk of population with ëonsiderable growth rate. This situation is causing an extreme strain on food resources. With ever increasing cost of feed ingredients and use of cereal grains in poultry feeds, which are also used for human consumption, makes it imperative to look for alternative.
Agro-industrial by-products or wastes, which are cheaper, not utilized for human consumption and are readily available merit consideration for poultry feeding. Rice polishing is one of the ingredients may scrve the desired purpose.
Rice, polishing is extensively used as an ingredient in animal diets. It represents excellent potential feedstuff for poultry if it is properly processed and stabilized. In spite of all its nutritional merits its utilization has a problem of rancidity & oxidation due to high oil content (12--l3%) & anti-nutritive factor lipase present in the rice. The rice polishing also contains anti- nutritive factors such as phytate, trypsin inhibitor, lectins and high fiber content. These factors can be removed by chemical or physical treatments.
This project is designed to study the eflbct ol' diflerent 1t'eatment on nutritive values of rice polishing and their biological availability for laying hens. Twelve iso-caloric and iso-nitrogenous rations at 10, 20, & 30% level of differently treated rice polishing were 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 & 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 rise polishing can safely be included in layer rations without any advrse effect on performance. It was also concluded that among rations, ration 1 (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