Effects of shiitake mushroom stalk meal on growth performance, carcass yield and blood composition in broilers
Buwjoom. T.(Kagawa Univ., Miki (Japan). Faculty of Agriculture) | Yamauchi, K.
To investigate the effects of the bottom third of shiitake mushroom stalk (SMM) on growth performance, carcass yield and blood composition, 280 Arbor Acre broilers were given ad libitum access to a commercial pellet diet (CP, 21%; ME, 3 kcal/g) until first week, and then they were divided to 0, 2.5, 5, 7.5 and 10% dietary SMM groups (SMM was mainly substituted for rice bran on the weight basis) of each four replications of 14 birds. The crude protein of these diets was adjusted to 21, 19 and 17% at 2-3, 4-6 and 7 weeks, respectively. The metabolizable energy of all diet groups was 3 kcal/g on air dry throughout the experimental period. Compared with the 0% SMM group, feed intake and body weight gain did not show difference up to the 7.5% SMM group, but both were lower in the 10% SMM group (P 0.05). Feed efficiency was almost similar in all groups. Carcass yield was higher in the 2.5 and 5% SMM groups (P0.05) than in the 0% SMM group. The weight of the breast with bone, wings, drum-sticks and thighs did not show differences among groups. Visceral organ weight did not show any differences. Blood triglyceride increased in the 5% SMM group (P 0.05). Blood glucose, cholesterol and uric acid were not different among groups. The present results suggest that the stalk of the shiitake mushroom can increase carcass yield and serum triglyceride at the 5% level. These carcass and triglyceride seem to be improved by the medicinal function of the SMM. In conclusion, SMM can be incorporated up to the 5% level for broiler diets without negatively affecting growth performance or carcass yield.
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