J. Anim Sci.
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J. Anim Sci. 1983. 57:495-502.
© 1983 American Society of Animal Science
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Feather and Hair Meals for Ruminants. IV. Effects of Chemical Treatments of Feathers and Processing Time on Digestibility1,2,

R. J. Steiner3, R. O. Kellems3 and D. C. Church4

Oregon State University, Corvallis 97331

Abstract

Chicken feathers were treated with various concentrations of NaOH or H3PO4 and then steam processed in a laboratory autoclave. In vitro pepsin digestibility (IVPD) of laboratory hydrolyzed feather meal (FM) increased (P<.05) as processing time and as NaOH (P<.005) or H3PO4 (P<.05) concentration increased. There was an interaction (P<.05) between chemical treatment and processing time. Crude protein (CP) levels of FM decreased (P<.01) as chemical concentration increased, but they were not affected by processing time. In vitro dry matter digestion (IVDMD) of a cellulose substrate increased (P<.05) as chemical concentration on feathers increased. A steam pressure vessel was designed and used to process FM for a sheep digestion trial. The FM made from feathers treated with .25% NaOH or .25% H3PO4 was compared with cottonseed meal (CSM). Treatment with NaOH increased (P<.05) IVPD and IVDMD as compared with no treatment or treatment with H3PO4. Data from the in vivo and in vitro studies suggest that NaOH could be effective in reducing processing time required at normal steam pressures. The H3PO4 was less effective and much higher concentrations were required to produce IVPD similar to that produced with the use of NaOH.

Footnotes

1 Tech. Paper No. 5999, Oregon Agr. Exp. Sta.

2 Partial research support provided by Fats and Proteins Research Foundation, Inc., Des Plaines, IL.

3 Dept. of Anim. Sci.

4 Present address: 1310 NW Hillcrest Drive, Corvallis, OR 97330.






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