عنوان مقاله [English]
In this experiment 144 Hy- line (W36) laying hens were used from 65-76 weeks of age in 4 treatments, 3 replicates
and 12 hens in each replicate in a completely randomized design. Experimental groups included: 1) control group,
2) 2.5% of apple wastes, 3) 5% of apple wastes, 4) 7.5% of apple wastes. The results showed that using apple waste
has signifcant effects on performance, egg quality and blood parameters of commercial laying hens (p<0.05). The
highest amounts of egg weight and egg mass, the highest egg production percentage, the best feed conversion,
and the lowest price of feed intake for production per kilogram of egg were resulted by using 5% of apple waste.
Using 7.5% of apple waste signifcantly decreased the amount of feed intake. Using more than 2.5% of apple waste
in laying hens diets had adverse effects on egg traits. In this case the percentages of eggshell, egg yolk, Haugh
unit and eggshell thickness decreased. The lowest level of blood cholesterol was resulted by using 2.5% of apple
wastes, whereas the highest level of lymphocyte was obtained by using 5% of apple wastes. The overall results
showed that using 5% of apple wastes improve the performance of laying hens, however using more than 2.5% of
apple waste has adverse effects on egg traits.