Effects of Oregano Carvacrol and Bacillus subtilis on Growth Performance,Nutrient Digestion and Metabolism,and Antioxidant Ability of Growing Wusuli Raccoon Dogs
This experiment was conducted to study the effects of oregano eugenol and Bacillus subtilis on growth performance,nutrient digestion and metabolism,and antioxidant ability of growing Wusuli raccoon dogs.A 3x3 two-factor design was used in the experiment.A total of 160 healthy(70±5)-day-old raccoon dogs were selected and randomly divided into 10 groups,and there were 4 replicates in each group and 4 rac-coon dogs in each replicate.The ratio of males to females in each replicate was 1∶1.The raccoon dogs in con-trol group were fed a basal diet supplemented with antibiotics(100 mg/kg quinocetone+500 mg/kg chlortetra-cycline);those in test groups Ⅰ,Ⅱ and Ⅲ were fed the basal diet supplemented with 100 mg/kg oregano carvacrol,and 150,300 and 450 mg/kg Bacillus subtilis,respectively;those in test groups Ⅳ,Ⅴ and Ⅵwere fed the basal diet supplemented with 200 mg/kg oregano carvacrol,and 150,300 and 450 mg/kg Bacil-lus subtilis,respectively;those in test groups Ⅶ,Ⅷ and Ⅸ were fed the basal diet supplemented with 300 mg/kg oregano carvacrol,and 150,300 and 450 mg/kg Bacillus subtilis,respectively.The pre-trial peri-od was 7 days and the trial period was 82 days.The results showed as follows:1)there were no significant differences in the initial weight,final weight,average daily gain,average daily feed intake and feed to gain ra-tio between the test groups and the control group(P＞0.05),and the final weight and feed to gain ratio of the test group Ⅲ were the best.2)The apparent digestibility of dry matter of test groups Ⅰ and Ⅲ was significant-ly higher than that of the control group(P＜0.05).The apparent digestibility of crude protein of test group Ⅳ,Ⅷ and Ⅸ was significantly higher than that of the control group(P＜0.05).There was no significant difference in the apparent digestibility of ether extract among groups(P＞0.05).3)The nitrogen deposition,net protein utilization rate and biological value of protein of test group Ⅳ were significantly lower than those of the control group(P＜0.05),but there were no significant differences between the other test groups and the control group(P＞0.05).4)Serum glutathione peroxidase(GSH-Px)activity in test group Ⅷ was the highest,which was not significantly different compared with control group and test groups Ⅳ,Ⅸ,but significantly higher than that of other groups(P＜0.05).Serum malondialdehyde(MDA)content in test groups Ⅱ and Ⅶ was significantly higher than that of test groups Ⅳ,Ⅵ and Ⅸ(P＜0.05),but there were no significant differences between the test groups and the control group(P＞0.05).In summary,the effects of appropriate oregano carvacrol and Ba-cillus subtilis to the diet on the growth performance,nutrient digestion and metabolism,and antioxidant ability of growing Wusuli raccoon dogs are similar to antibiotics.Under the conditions of this experiment,the optimal supplemental levels of oregano carvacrol and Bacillus subtilis in diets of growing Wusuli raccoon dogs are 100 and 450 mg/kg,respectively.[Chinese Journal of Animal Nutrition,2024,36(6):3931-3941]
oregano carvacrolBacillus subtilisWusuli raccoon dogsgrowth performancedigestion and metabolism of nutrientsantioxidant ability
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