Effects of dietary inclusion of medicinal plant's by-product mixture on performance of laying hens receiving different omega-6 to omega-3 ratios

The effects of dietary inclusion of medicinal plants’ by-product mixture on performance, the relative internal organ weight, ileal microbial counts, and small intestinal and liver morphologic alterations in laying hens receiving different omega-6 to omega-3 ratios as a 2×3 factorial arrangements with three levels of plants’ by-product (0, 2.5 and 5%) and two omega-6 to omega-3 ratios based on completely randomized design containing 6 treatments with 4 replicates of 5 birds each. Feeding low dietary omega-6 to omega-3 ratio to hens led to a significant increase in the relative spleen weight, the number and diameter of lamina propria lymphoid follicles and middle egg production percentage (P=0.05), and a reduction in the relative liver weight and hepatic fat percentage (P