However the knowledge on using humates as feed additives in animal nutrition is not conclusive and especially humates were used as a part of replacement therapy for digestive system disorders such as malnutrition and diarrhea (EMEA, 1999). Indeed, Yoruk et al. (2004) reported that supplementation of humate into the diet at level of 0.1 and 0.2% during the late laying period increased egg production, improved feed efficiency and reduced mortality.