Research on determination method of water holding capacity of dietary ingredient and correlation between water holding capacity with its nutritional indexes
The purpose of this experiment is to establish a method for measuring the centrifugal water holding capacity of feed materials.The water holding capacity of 21 diets was measured by membrane centrifugation,and the correlation between water holding capacity and nutritional indexes of diets was analyzed.The results showed that the optimum conditions for the determination of water holding capacity of feed materials by centrifugation of filter membrane were as follows:Pore diameter of filter membrane 25 μm,centrifugal speed 3 000 r/min.The standard deviation and average expanded uncertainty of the measurement results of centrifugal water holding capacity of filter membrane are less than those of centrifugal method the water holding capacity of diets was significantly positively correlated with hemicellulose content(P＜0.05),positively correlated with neutral detergent fiber content(P＞0.05),and negatively correlated with starch content.The study indicates that the establishment of centrifugal water holding capacity determination method of feed materials can provide reference for accurate determination of water holding capacity and later formula design.
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