Abstract: A study was conducted to evaluate the effects of addition different levels of probiotic to practical-type diet on the performance, egg quality and blood parameters of laying hens. The levels of probiotc was (0, 1000 and 2000 g Bioplus 2B ton-1 DM which provide 0, 3.2x106 and 6.4x106 cfu g-1 bacteria in feed). Twenty-seven Hy-Line W-36 strains of white Leghorn laying hens were assigned by a completely randomized design to 3 treatments with 3 replicates for each. Addition probiotic to the diets caused to significant increase (p<0.05) of egg production and egg mass and significant decrease (p<0.05) of feed conversion ratio. Probiobic improved egg weight, shell hardness and Haugh unit but not significant (p>0.05). Probiotic supplementation significantly decrease (p<0.05) the cholesterol and triglyceride of plasma also yolk cholesterol. Generally, the results showed that using 1000 g ton-1 probiotic had the best results than level of 2000 g ton-1.
Ali Aghaii, Morteza Chaji, Tahereh Mohammadabadi and Mohsen Sari, 2010. The Effect of Probiotic Supplementation on Production Performance, Egg Quality and Serum and Egg Chemical Composition of Lying Hens. Journal of Animal and Veterinary Advances, 9: 2774-2777.