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True protein digestibility and amounts of endogenous protein measured with the 15N-dilution technique in piglets fed on peas (Pisum sativum) and common beans (Phaseolus vulgaris)

Author: Huisman, J. · Heinz, T. · Poel, A.F.B. van der · Leeuwen, P. van · Souffrant, W.B. · Verstegen, M.W.A.
Type:article
Date:1992
Institution: Centraal Instituut voor Voedingsonderzoek TNO
Source:British Journal of Nutrition, 1, 68, 101-110
Identifier: 231800
Keywords: Common beans · Endogenous protein · Peas · Piglets · True protein digestibility · Vegetable protein · Adolescent · Animal experiment · Animal food · Bean · Digestion · Feces analysis · Intestine · Nonhuman · Protein intake · Weight gain · Weight reduction · Animal · Body Weight · Diet · Dietary Proteins · Digestion · Fabaceae · Feces · Nitrogen Isotopes · Plants, Medicinal · Swine

Abstract

The faecal and ileal true protein digestibilities of the raw pea (Pisum sativum) varieties finale and frijaune and the ileal true protein digestibility of steam-processed common beans (Phaseolus vulgaris) were measured in piglets using the 15N-dilution technique. The faecal true protein digestibility of both pea varieties was about 97. The ileal true protein digestibility was between 93 and 95, indicating that the pea protein is almost completely enzymically digested in the small intestine. The faecal apparent protein digestibility was 85 for both varieties while at the ileal level it was 79 and 74 respectively. The lower ileal apparent protein digestibility of peas can be attributed completely to the excretion of endogenous protein. The ileal apparent protein digestibility of toasted common beans was about zero (-4); the ileal true protein digestibility was about 66. This indicates that the protein of the common bean, although toasted, was highly resistant to enzymic digestion. It was calculated that per kg ingested bean protein, 340 g undigested bean protein and 700 g endogenous protein passed the terminal ileum. The results of the present study explain why in previous experiments a strongly reduced weight gain and even weight loss was observed in piglets fed on raw and toasted common beans. Chemicals/CAS: Dietary Proteins; Nitrogen Isotopes