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Development of a Novel Enzymatic Pretreatment for Improving the Digestibility of Protein in Feather Meal

Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada
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AgriEngineering 2019, 1(4), 475-484; https://doi.org/10.3390/agriengineering1040034
Received: 30 August 2019 / Revised: 25 September 2019 / Accepted: 1 October 2019 / Published: 7 October 2019
This study describes the process of developing an enzymatic pretreatment to improve the nutritional value of feather meal (FeM). In a first experiment, a full factorial design was used to examine the effects of various incubation conditions on the solubilization of nitrogen in FeM. We incubated FeM for 3 h with various levels of a commercial alkaline serine protease (Savinase® 16L), sodium sulphite (Na2SO3), and digestion buffer. A Savinase® 16L level of 3% (%FeM v/w), Na2SO3 level of 3% (%FeM w/w), and digestion buffer level of 500% (%FeM w/w) were identified as the optimal conditions. Under these optimal conditions, 45% of the nitrogen in FeM was solubilized. In a second experiment, we evaluated the effect of more economically sustainable incubation conditions on the in vitro digestibility of protein (pepsin-HCl digestibility and multistep protein evaluation) in FeM. Two FeMs were incubated with 0.5% Savinase® 16L (%FeM v/w), 2% Na2SO3 (%FeM w/w), and 200% buffer (%FeM w/w) for 24 h. The pretreatment improved pepsin-HCl digestibility by 7–16% and the total tract degradable protein content by 14–50%. Accordingly, this novel pretreatment could be applied in the animal feed industry to improve the nutritional value of FeM. View Full-Text
Keywords: digestibility; enzymatic hydrolysis; feather meal; keratin; protein digestibility; enzymatic hydrolysis; feather meal; keratin; protein
MDPI and ACS Style

Pfeuti, G.; Osborne, V.; Shoveller, A.K.; Ignatz, E.H.; Bureau, D.P. Development of a Novel Enzymatic Pretreatment for Improving the Digestibility of Protein in Feather Meal. AgriEngineering 2019, 1, 475-484.

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