بررسي اثر روش هاي مختلف تولك بري بر عملكرد مر غ هاي تخمگذار لگهورن سويه، هاي لاين 36-W

The Effects of Different Molting Programs on Performance of W-36 Hy-line Laying Hens

This experiment was conducted to determine the effects of different molting programs on performance of W-36 Hy-line laying hens. The experiment was based on a completly randomized design. The experimental treatments were: restricted feeding method (on-off), California method with 4-d feed removal period (CAL-4), California method with 10-d feed removal period (CAL-10), north Carolina method with 14-d feed removal period (NC-l), north Carolina method with modified diet in resting period (NC-2), full fed (FF) method based on high corn molt diet, Recommended Method by breeding management guide (RM). Early egg production was significantly different among such long term feed removal methods as (CAL-10), (NC-l), (NC-2) and other treats (P0.05). Different molting procedures had no effect on feed conversion ratio (FCR) in the production period. Body weight reduction was significantly different between (FF), (CAL-4) treats and such long-term methods as (NC-l), (NC-2) (P<0.05). Shell thickness, egg persistency, haugh unit, and relative egg shell weight were determined in pre-experiment as well as in 5 and 10 weeks past the second production and there was no difference observed among these parameters although increased with molt in all groups. The results indicated that induced molting is an effective way to recovery in both quality and rate of egg production and it was concluded that the Full Fed (FF) program in addition to being suitable and simple was The optimum method for recovery of production, along with the needed animal welfare.