The effect of partial and complete substitution of rice broken instead of corn in returns and productive performance of Lohmann layer hens

Abstract

The effect of partial and complete substitution of rice broken instead of corn in returns and productive performance of Lohmann layer hensAbstractThis experiment was conducted on poultry farms of Al-Kufa Company for eggs production from 1/5/2007 to 1/9/2007. The study aimed to investigate the effect of substituting rice broken for corn in layer diets. Seventy two thousands hens (40 weeks old) commercial Lohmann brown egg breed were used in the study. The hens were randomly distributed into four treatments (4 houses).Each house contained 18000 hens and 5 replicates per treatment each replicate contained 3600 hen which were distributed into three stages each one contained 1200 hens which located in wire-cages each cage contain 4 hens. The hens fed the experimental diets, which were as following:T1: 15% corn (control)T2: 10% corn + 5% rice brokenT3: 5% corn + 10% rice brokenT4: 0% corn + 15% rice brokenData were collected for weight gain, live body weight, egg production (%), egg mass, egg weight, feed consumption, feed conversion ratio, mortality and productive costs per (4) weeks during the 40-56 weeks of age.Results showed that:-No significant differences (P<0.05) were found among treatments in weight gain, live body weight, egg weight, feed consumption, feed conversion ratio and mortality rate at different egg production periods.-There were significant differences (P<0.05) in each treatment at all production periods. The highest weight gain was at 44 and 48 weeks age, however the lowest weight gain was at 56 weeks age.-There were significant differences (P<0.05) among treatments in egg production and egg mass. T1 and T2 showed the highest of them was at 44 and 48 weeks age, however T3 and T4 showed the lowest egg production and egg mass at was 56 weeks age.