Nutritional impact of inclusion of garlic (Allium sativum) and/or onion (Allium cepa L.) powder in laying hens’ diets on their performance, egg quality, and some blood constituents

Abstract

Incorporating GP, OP, and the mixture of them in laying hen diets had no significant effect on the average egg weight and consumption/hen/day throughout the three stages of egg collection, but had a significant improvement in the number of eggs/hen, percentage of egg production, egg mass/hen, and feed conversion. Inclusion of GP, OP, or the mixture of them in laying hen diets had no significant effect on the shape index, Haugh unit, albumin, and shell percentages; also, an insignificant increase for shell thickness was observed, but egg weight increases (P < 0.05). Incorporation of GP, OP, and the mixture of them significantly decreased (P < 0.05) total cholesterol concentration. Also, an inclusion of 0.5% GP, 1% GP, and 1% OP + 1% GP decreased (P < 0.05) high-density lipoprotein. Inclusion of only 1% OP + 1% GP (G6) decreased (P < 0.05) glutamic oxaloacetic transaminase; meanwhile, supplementation of 1% OP, 1% OP + 0.5% GP, or 1% OP + 1% GP increased (P < 0.05) creatinine.