Effect of Dietary Humic Acid Via Drinking Water on the Performance and Egg Quality of Commercial Layers
This study was designed to investigate whether inclusions of humate into diets of hens during the late laying period increases egg production and improves egg quality. Hy-Line W-98 commercial White Leghorn (n=120), 50wk of age, were fed a control diet, 2.0, 4.0 or 6.0 mg of humic acid per kg live body weight for 65 d. Egg production was measured daily, egg weight and feed intake were measured biweekly. A sample of 30 eggs from each group was collected randomly to determine egg quality every 14d. The results showed that the laying hens that consumed drinking water with humic acid had greater (P ≤ 0.05) egg production, egg weight and egg mass than the control. Similarly, feed conversion improved (P ≤ 0.05) with the administration of humic acid in water. Yolk colour and egg grading from hens consuming humic acid water containing were significantly (P ≤ 0.05) improved than those from the control group. Formic acid had no effect (P ≥ 0.05) on albumin height and Haugh unit. In addition, the geometric means haemagglutination inhibition (HI) titres against Newcastle disease of birds consuming water containing humic acid were higher on all sampling days than those consuming water without acid. This study showed that humic acid at levels of 6.0 mg per kg live body weight positively influences production parameters including reduced mortality and feed conversion efficiency. However, there were no consistent effects on egg quality parameters.
Humic Acid, Egg Production, Egg Quality, Immunity
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