Effect Of Replacing Different Levels Of Corn With Raisin By-Product On Production Properties And Digestibility In Old Laying Hens (Hy-Line Strain W-36)

Abstract

An experiment was performed to investigate the possibility of replacing different levels of corn with raisin by-product (Shekarak) and its effect on production properties and digestibility in laying hens (Hy-Line W-36) after molting. A completely randomized design with a factorial arrangement of 2*5 with 5 levels of by-product (0, 5, 10, 15 and 20%) and 2 enzyme levels (0 and 0.03%), 8 replications and 4 hens per replication and a total of 320 laying hens (Hy-line W-36) at 78-week-old in three 21-day experimental periods (A total of 63 days). The results of this study showed that feed consumption in the experimental group, 10% by-product with 0.03% enzyme significantly increased (P<0.05) and in the first and second periods, the average feed consumption and egg production percentage compared to the third period has increased significantly. The percentage of egg production in the control group and 0.03% phytase enzyme was increased (P<0.05) significantly, also the control group with 5% by-product, 10% by-product and the experimental group 10% by-product with the phytase enzyme increased the ability of protein digestion. Also, the effect of period on egg quality properties was significant and the shell weight in the first and third periods and yolk color index in the first period increased significantly (P<0.05). In this study, the use of by-product at the level of 10%, if it replaces corn at the level mentioned, in addition to improve the quality of egg, it also effects in reducing the feed costs in laying hens.