Abstract
This study investigated the effects of dietary fulvic acid (FA) supplementation on the growth performance, body composition, oxidative status, and immunity of broilers. A total of 720 broilers were randomly divided into 4 groups, namely a control group and 3 treatment groups that received diets supplemented with 3 different levels of FAs (0.2, 0.6, and 1g kg-1). The diets supplemented with 0.6 or 1g kg-1 FAs increased the body weight gain. This treatment also increased the activities of digestive enzymes (amylase, lipase, and protease), the meat protein content, the total polyunsaturated fatty acid content, the superoxide dismutase activity, the glutathione peroxidise activity, and the serum levels of IgG, IgM, and IgA but decreased the meat fat content and the malondialdehyde level compared with those in the control. However, high FA dose (> 0.6g kg-1) did not further increase the efficiency compared with moderate dose (0.6g kg-1). Results indicate that FAs might be a promising dietary supplement for broilers.
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