To investigate the effects of different CP levels on the secretion performance of muskrats,60 one-year-old muskrats were randomly divided into 5 groups(6 replicates per group,1 male and 1 female muskrat per replicate,only male muskrats were sampled),fed diets with CP levels of 16％,18％,20％,22％and 24％,for a pre-feeding period of 10 days and a trial period of 73 days.The results showed as follows:1)on the 12th day of the experiment,the fragrance production of muskrat in 22％group was the highest,and the fra-grance production of muskrat in 24％group was the lowest,and it was significantly lower than that in 18％,20％and 22％groups(P＜0.05).On the 36th and 63rd day of the experiment,the fragrance production of muskrat in 22％group was significantly higher than that in other groups(P＜0.05),but there was no signifi-cant difference among other groups(P＞0.05).With the increase of dietary CP level,the total fragrance pro-duction of muskrats in 18％and 20％groups was increased,and the total fragrance production of muskrats in 22％group was the highest,and significantly higher than that in other groups(P＜0.05).When dietary CP lev-el was further increased to 24％,the total fragrance production of muskrats began to decrease and was lower than that in other experimental groups,but the difference was not significant(P＞0.05).2)There was no sig-nificant difference in moisture content of fragrance liquid between groups(P＞0.05),but the content of cyclo-pentadecanone in fragrance liquid in 22％group was significantly higher than that in other groups(P＜0.05),the lowest content was in 24％group.3)The contents of blood testosterone and estradiol showed an upward trend with increasing dietary CP level,and the contents of testosterone and estradiol in 20％,22％and 24％groups were significantly higher than those in 16％group(P＜0.05).4)The serum urea nitrogen(UN)con-tent in 16％group was the lowest and significantly lower than that in other groups(P＜0.05),and the serum UN content in 22％group was the highest,and significantly higher than that in 20％group(P＜0.05).The se-rum total protein(TP)content in 24％group was the lowest,which was significantly lower than that in other groups(P＜0.05);serum albumin(ALB)content in 16％group was the lowest,and significantly lower than that in other groups(P＜0.05),and significantly higher than that in 16％and 24％groups(P＜0.05).These results indicate that the dietary CP levels affect the secretion performance of muskrats.Muskrats have the high-est scent production,better quality of muskrat fragrance when dietary CP level is 22％.[Chinese Journal of Animal Nutrition,2023,35(12):8001-8012]
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