Effect of fermented rice protein,enzymatically hydrolyzed fish protein,and fish meal on available energy and ileal amino acid digestibility of growing pigs
The aim of the experiment was to study the effects of fermented rice protein(FRP),enzymatic hydrolysis fish protein(EHFP),and fish meal(FM)on the digestible energy(DE),metabolizable energy(ME),and ileal digestibility of amino acids in growing pigs.Experiment one:24 healthy'Duroc×Landrace×Yorkshire'castrated male pigs with an average body weight of(15.27±1.12)kg were randomly assigned to the control group(basal diet),FRP group(20％FRP),EHFP group(20％EHFP),and FM group(20％FM),with six replicates per group,each replicate with one pig.The total fecal collection method was used to determine the total tract apparent digestibility of energy,metabolizable energy,and gross energy.Experiment two:Twelve'Duroc×Landrace×Yorkshire'castrated male pigs with an average body weight of(18.36±1.35)kg,fitted with a T-shaped fistulas,were used in a 4×2 Youden square design.They were randomly assigned to the control group(nitrogen-free diet),FRP group(25％FRP),EHFP group(30％EHFP),and FM group(20％FM),with three replicates per group,each replicate with one pig.The indicator method was used to calculate the apparent ileal digestibility(AID)and the standard ileal digestibility(SID)of amino acids.The DE and ME(feeding basis)of pigs in FPR group were 19.28 and 17.64 MJ/kg,the DE and ME(feeding basis)of pigs in EHFP group were 21.93,19.92 MJ/kg,and the DE and ME(feeding basis)of pigs in FM group were 15.12,13.48 MJ/kg,respectively.The SID of amino acids for the FRP and EHFP groups were 73.06％to 88.66％and 87.98％to 94.92％,respectively.Both the DE and ME of the FRP and EHFP groups were significantly higher than those of the FM group(P＜0.05).Except for methionine,alanine,aspartic acid,and proline,the SID of other amino acids in the EHFP group was significantly higher than that in the FM group(P＜0.05),while the SID of methionine in the FRP group was significantly lower than that in the FM group(P＜0.05),and the SID of threonine,proline,and tyrosine was significantly lower than that in the FM group(P＜0.05).The study indicates that based on the results of digestible energy and amino acid SID,FPR and EHFP can be used as new types of high-quality protein feed in pig production.
growing pigsprotein raw materialsdigestible energymetabolizable energyterminal ileal amino acid digestibility
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