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Quantitative in Vitro Evaluation of the Energy Metabolism Influenced by Virginiamycin and Spiramycin used as Growth Promoters in Pig Nutrition¹

Laboratory of Nutrition and Hygiene, Faculty of Agricultural Sciences State University of Ghent, Proefhoevestraat, 10, B-9230, MELLE — Belgium

Abstract

Production rates of metabolites from a lactose diet were studied in vitro incubating stomach, ileal and cecal contents, collected from cannulated young pigs. Incubating stomach contents, bacterial activity was quantitatively not important after 4 hr of incubation. The bacterial activity in ileal contents on the other hand was characterized by an important production of lactic acid and volatile fatty acids. Addition of virginiamycin and spiramycin resulted in decreased organic acid production and in sparing of a measurable quantity of glucose. The fermentation of cecal contents was characterized by a pronounced volatile fatty acid fermentation, stimulated by spiramycin and decreased by virginiamycin. Bacterial production rates were also assessed by a dynamic incubation system to better imitate the intestinal transit. By combination with some in vivo data the sparing of carbohydrates with antibiotics could be expressed as a higher availability of the net energy content required for growth. The percentage calculated approximates the growth promoting ratio in vivo.

¹ Invitational paper presented as part of the Symposium on the Relationships between Gut Microflora and the Nonruminant Host held at the University of Wisconsin, Madison, July 26, 1977 during the 69th Annual Meeting of the ASAS.

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