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【Abstract】 The ovarian toxicity of galactose and the preventive effects of taurine on the toxicity induced by galactose in egg-laying Japanese quail were investigated.120 five-month-old egg laying Japanese quails were randomly and equally divided into four groups.In the first stage,the diets for four groups were added with:A.control(without taurine and galactose);B1%taurine;C10% galactose;D10% galactose+1% taurineIn the second stage,the diets were added with Acontrol (without taurine and galactose);B1% taurine;C5% galactose;D5% galactose+1% taurine.Egg production including number and weight,food intake and mortality were recorded.Egg production (number and weight)and food intake were decreased strikingly after exposure to 10% galactose.After 9~10 d of 10% galactose treatment,the quails nearly stopped laying eggs and the death percentage increased to 20% which was six times the rate of 333% in the other three groups(P<005).The total food intake at the first stage in group C was just half of that in group A and group B.1% taurine had delayed onset of decreased egg production induced by 10% galactose,and the egg production in group D remained higher than that in group C throughout.In the second stage,when galactose was decreased to 5% in the diet,the egg production and food intake increased.Egg production in the group D recovered more rapidly than that in group C(P<005).At the end of the second stage,the egg production and food intake were nearly identical to those in group A and group B,showing that 1% taurine was effective on preventing the toxicity induced by 5% galactose.The data indicates:①Japanese quail is much sensitive to the toxicity of galactose,because galactose is not tolerated by quail when fed at 10 percent of the diet;②taurine is highly effective on preventing the ovarian toxicity of galactose;③further studies of the ovarian actions of galactose should take advantage of this novel animal model.