Abstract: Experiments were conducted with twenty six-month old Liaoning cashmere goats with average live weight of 16 kg.The experiment was composed of two groups,there were cysteamine group and control group repectively.Each experimental group was feed by the same basic diet.The cashmere goats in the control group was only feed with basic diet,while the CS group feed with the basic diet added with cysteamine 100 mg/kg W.B. one time every week.Effects of cysteamine on the physical quality of down and hair in cashmere goats was studied in the experiment.The periods of experiment had sixty days.The results showed that CS group of down lengh and hair lengh,down stretched length,hair stretched length were significantly higher than those of control group (P＜0.05).Compared with control group,down strength and hair strength,down elongation and hair elongation of CS group there were no significantly different than those of control group (P＜0.05).The results indicated that the cysteamine made better the cashmere quality of cashmere goats.

Key words: cysteamine; cashmere goat; down diameter