Effects of Dietary Methionine Level on Wool Production Performance and Hair Follicle Development of Angora Rabbits
This study was conducted to investigate the effects of different levels of methionine supplementation on wool production performance and hair follicle development of Angora rabbits.A total of 200 9-month-old Angora rabbits,half male and half female,with similar body weight and good growth condition,were randomly divided into five groups with 40 replicates per group and one rabbit per replicate.Rabbits in the control group were fed a basal diet,and those in the experimental groups were fed the basal diet supplemented with 0.15％,0.30％,0.45％and 0.60％methionine,respectively(the overall dietary methionine levels were 0.41％,0.56％,0.71％and 0.86％,respectively).This trial lasted for 70 days.After the experiment,indexes related to the production performance were calculated,hair and fur samples were collected to detect the hair quality,hair follicle density and the expression of genes related to hair follicle development.The results showed that,compared with the control group,0.30％and 0.45％methionine supplementation significantly improved the average daily feed intake(P＜0.05).Dietary supplemented with 0.15％methionine significantly increased elongation length and elongation rate of hair(P＜0.05)of rabbits and significantly reduced primary hair follicle density(P＜0.05)of rabbits.Moreover,supplementation of 0.30％methionine significantly increased the hair production rate and secondary primary ratio(P＜0.05)of rabbits and significantly reduced the more than 25 pm fiber content,coarse hair rate and primary hair follicle density(P＜0.05)of rabbits.Meanwhile,dietary supplemented with 0.45％methionine significantly increased(P＜0.05)the ratio of feed to hair,elongation length,elongation and secondary primary ratio and significantly decreased the fiber content above 25 pm,coarse hair percentage and primary hair follicle density(P＜0.05)of rabbits.In addition,dietary supplemented with 0.30％methionine significantly upregulated the mRNA expression of epidermal growth factor(EGF)(P＜0.05)in the skin of rabbits.In conclusion,the appropriate dietary methionine supplemental level can improve the hair production performance and hair quality of Angora rabbits.EGF signal may be involved in promoting rabbit hair follicle development.Under the condition of the current experiment,it is suggested that the optimal supplemental level of methionine is 0.30％in dietary of Angora rabbits(the overall dietary methionine level is 0.56％).
Angora rabbitmethioninewool production performancehair follicle development
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