China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (7): 2567-2577.doi: 10.16431/j.cnki.1671-7236.2022.07.014

• Nutrition and Feed • Previous Articles     Next Articles

Effects of Citrus Extract on Protein Metabolites in the Hindgut Digesta of Finishing Pigs

CUI Yiyan1, LU Huijie1, TIAN Zhimei1, DENG Dun1, LI Zhenming1, YU Miao1, MA Xianyong1,2   

  1. 1. Guangdong Engineering Technology Research Center of Animal Meat Quality and Safety Control and Evaluation, Guangdong Key Laboratory of Animal Breeding and Nutrition, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs, State Key Laboratory of Livestock and Poultry Breeding,Institute of Animal Science, Guangdong Academy of Agricultural Science, Guangzhou 510640, China;
    2. Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Maoming 525000, China
  • Received:2021-12-20 Online:2022-07-05 Published:2022-06-29

Abstract: 【Objective】 The effects of citrus extract on protein metabolites in the hindgut digesta of finishing pigs were studied in this experiment,in order to provide basis for the regulation of citrus extract on the generation of odor from the source.【Method】 One hundred and eight 56-day-old Duroc×Landrace×Large White pigs weighted (19.73±0.39) kg were randomly assigned to 3 groups with 6 pans per group and 6 pigs per pan (same male and female).Pigs in the control group were fed basal diets,pigs in the antibiotic group were fed the basal diets supplemented with 75 g/t chlortetracycline,and pigs in the citrus extract group were fed the basal diets supplemented with citrus extract (250 mL/t during 56 to 112 days of age and 200 mL/t during 113 to 194 days of age).The cecal and colonic digesta was collected from finishing pigs at 194 days of age,and the contents of free amino acids,phenols,indoles,and biogenic amines in the digesta were determined.【Result】 ①In cecal digesta,compared to control group,adding citrus extract and antibiotic significantly decreased the levels of taurine,aspartic acid,alanine,valine,leucine,lysine,histidine,arginine,indole,and methylamine (P<0.05).Adding citrus extract tended to decrease the levels of threonine,serine,glutamic acid,glycine,citrulline,isoleucine,proline,and skatole (0.05≤P<0.10),significantly decreased the levels of phenol,putrescine,tyramine,and spermine (P<0.05).Compared to antibiotic group,dietary with citrus extract decreased the levels of putrescine and tyramine (P<0.05).②In colonic digesta,compared to control group,dietary with citrus extract and antibiotic significantly decreased the levels of aspartic acid,serine,isoleucine,cystathionine,leucine,γ-aminobutyric acid,total amino acids,phenol,p-cresol,skatole,and methylamine (P<0.05),and tended to decrease the levels of proline and indole (0.05≤P<0.10).The levels of serine,isoleucine,cystathionine,leucine,total amino acids, and p-cresol in the citrus extract group were significantly lower than those in antibiotic group (P<0.05).Compared to control group,dietary with citrus extract decreased the levels of threonine,glutamic acid,glycine,ornithine,and tyramine (P<0.05),and tended to decreased the level of spermidine (0.05≤P<0.10).The levels of phenylalanine,tryptophan,and lysine in the citrus extract group were significantly lower than those in control and antibiotic groups (P<0.05).【Conclusion】 Dietary with citrus extract decreased the protein metabolite levels in the hindgut digesta of finishing pigs,reduced the production of odor.

Key words: citrus extract; pig; hindgut; biogenic amine; free amino acid

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