缓释甲酸对北京鸭生产性能、胸肌肉品质及肠道健康的影响OA

[Objective]This experiment aimed to investigate the effects of dietary slow-release formic acid supplementation on growth performance,slaughter performance,breast muscle quality,plasma biochemical indices,and intestinal health of Pekin ducks.[Method]A total of 192 healthy 1-day-old male Pekin ducks were assigned to three groups in a single-factor completely randomized design.Ducks were fed experimental diets supplemented with 20%slow-release formic acid at 0(control group),500 mg/kg(FA500),and 750 mg/kg(FA750),respectively.Each group consisted of eight replicates,with eight ducks per replicate.The trial lasted 42 days.Growth performance was recorded throughout the experimental period.At 21 and 42 days of age,one duck with body weight close to the average of each replicate was selected for wing vein blood collection and slaughter.Slaughter performance,the lengths of different small intestinal segments,plasma biochemical indices,meat quality,and cecal microbial composition were determined.[Result]①Compared with control group,ducks in FA500 and FA750 groups tended to have increased average body weight at 35 days of age,average daily feed intake and feed-to-gain ratio from 1 to 14 days of age(0.05<P<0.10).② Compared with control group,there was no significant difference in the slaughter performance of Pekin ducks in FA500 and FA750 groups(P>0.05).③ Compared with control group,the breast muscle lightness and pH of 42-day-old Pekin ducks in FA500 group significantly decreased at 45 min and 24 h(P<0.05),while ducks in FA500 group had significantly lower lightness at 45 min(P<0.05).④ Compared with control group,plasma biochemical indices were not significantly affected in FA500 and FA750 groups(P>0.05).⑤ Compared with control group,duodenal length of 21-day-old Pekin ducks in FA500 group was significantly increased(P<0.05),and ileal length tended to increase in FA500 and FA750 groups(0.05<P<0.10).⑥ Compared with control group,the relative abundance of norank_f_Prevotellaceae,Prevotellaceae_NK3B31_group,and Prevotellaceae_Ga6A1_group in the cecum of 21-day-old Pekin ducks in FA750 group was significantly increased(P<0.05),while the relative abundance of Mucispirillum was significantly decreased(P<0.05).[Conclusion]Under the conditions of this study,dietary supplementation with 500-750 mg/kg slow-release formic acid tended to increase the average body weight of Pekin ducks at 35 days of age.It also improved breast muscle color in 42-day-old Pekin ducks,promoted intestinal development in 21-day-old Pekin ducks,and significantly increased the relative abundance of cecal Prevotella.