The effect of probiotic supplementation on productive traits, egg quality and plasma cholesterol of broiler breeder hens
نویسندگان
چکیده
The present study was conducted to investigate the effects of four different levels of dietary probiotic (protexin) on productive traits and egg quality of broiler breeder hens. One hundred sixty female 64-week-old broiler breeders (Hubbard classic) were involved in this experiment. The birds were randomly assigned to control Group A (unsupplemented diet), Group B (0.25% protexin supplemented diet), Group C (0.5% protexin supplemented diet) and Group D (0.75% protexin supplemented diet) for 10 weeks. Results showed that addition of probiotic had not any significant effect on egg production, egg mass and feed conversion ratio but effect of probiotic on egg weight was significant (P < 0.05), The egg weight of control group was the highest and was higher (P < 0.05) than group B but was not statistically different from group C and group D. Furthermore supplementation of probiotic had no significant effect on percentage of egg shell, shell thickness, egg shell strength, specific gravity and haugh unit. Overall, it was concluded that dietary supplementation of probiotic had no effect on productive traits, egg quality and plasma cholesterol of 64-week-old broiler breeder hens.
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