Physical treatment and protease or probiotic supplementation and feather meal digestibility by broilers
Y. M. Sun
A * , X. Li A , D. Zhang A and W. L. Bryden A B
A
B
Abstract
Improving the utilisation of alternative protein ingredients in livestock production will reduce feeding costs and improve industry sustainability. Feather meal (FM) is an abundant, alternative protein source with a high protein content but poor amino acid (AA) digestibility.
This study evaluated strategies for improving AA digestibility of FM.
Experiment 1 examined the effects of physical treatment with ultrasound, microwave and autoclaving on FM AA profile and digestibility. Experiment 2 evaluated the dietary addition of a protease (Ronozyme ProAct, 200 and 600 mg/kg; RPA) and a probiotic (BioPlus 400, 1500 mg/kg) on FM AA digestibility. Apparent ileal digestibility was determined by feeding each treatment to four replicate groups of six birds in Experiment 1 and five replicate groups of seven birds in Experiment 2, and then collecting the contents of the lower half of the ileum.
None of the physical treatments improved (P > 0.05) the AA profile or ileal AA digestibility of FM. Dietary supplementation with RPA at 200 mg/kg or BioPlus 400 at 1500 mg/kg did not significantly (P > 0.05) influence the apparent ileal AA digestibility of FM. However, the higher concentration of RPA (600 mg/kg) significantly (P < 0.05) increased the apparent ileal AA digestibility of FM.
The increased digestibility of FM by the protease and numerical increase (P < 0.1) by the probiotic (1500 mg/kg) presumably reflects keratinase activity of both feed supplements.
The results of this study indicated that there is scope for further improvement in the nutritive value of FM for broilers.
Keywords: amino acid digestibility, autoclave, broilers, feather meal, microwave, probiotic, protease, ultrasound.
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