EFFECT OF POULTRY BY-PRODUCT MEAL SUPPLEMENTED WITH L-LYSINE, DL-METHIONINE AND L-HISTIDINE AS A REPLACEMENT FOR FISHMEAL ON THE PERFORMANCE OF RAINBOW TROUT
Title: EFFECT OF POULTRY BY-PRODUCT MEAL SUPPLEMENTED WITH L-LYSINE, DL-METHIONINE AND L-HISTIDINE AS A REPLACEMENT FOR FISHMEAL ON THE PERFORMANCE OF RAINBOW TROUT
Principle Investigator: Ronald Hardy
Objective: To determine the effect of supplementing L-lysine, DL-methionine and L-histidine in poultry by-product meal to replace fishmeal on the performance of rainbow trout.
Lay Summary/Industry Summary:
Four experiments were conducted to evaluate the nutritional value of poultry by product meal (PBM) and the effects of supplementing synthetic lysine, methionine, and histidine on growth, feed conversion ratio, and survival of rainbow trout.
In experiment #1, apparent digestibility coefficients (ADCs) of three types of PBMs (feed grade, prime and refined) and two fish meals (herring and menhaden) were measured using settlement method of fecal collection. Although there were significant differences in ADCs of nutrients among these ingredients, refined PBM (R-PBM) had similar ADCs to herring meal.
In experiment #2, Rainbow trout were fed R-PBM based diets supplemented with or without synthetic lysine (LYS) to replace 25, 50, 75, and 100% herring meal. Six-wk feeding results showed that R-PBM could replace up to 75% fishmeal without reducing WG, FCR, and survival; Furthermore, when LYS was supplemented at 0.29% in R-PBM based diets, it could replace 100% fishmeal without reducing WG, FCR, and survival. Lysine supplementation significantly improved WG but not FCR; fishmeal replacement also had significant effects on WG and FCR for fish fed R-PBM based diets.
In experiment #3, R-PBM was supplemented with synthetic methionine (MET) and LYS to replace 83.3, 91.6, and 100% herring meal. Eight-wk data indicated that fish fed MET and LYS supplemented diets grew faster than those fed the fishmeal diet although the differences were not statistically significant (P > 0.05), indicating that R-PBM could replace 100% herring meal when MET (0.13%) and LYS (0.29%) were supplemented.
In experiment #4, R-PBM was supplemented with synthetic histidine (IDS), LYS and MET. Six-wk feeding trial that when synthetic LYS (0.29%) and MET (0.13%) were supplemented, R-PBM could replace 100% of high quality herring meal without reducing fish WG, FCR, and survival. HIS level of 0.66% in R-PBM based diets was sufficient to promote fish growth. There was no necessary to supplement HIS to R-PBM based diets for rainbow trout.