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Lower Food Intake is a Primary Cause of Reduced Growth Rate in Growing Pigs Fed Rapeseed Presscake Meal^1,2,3,

Division of Nutrition Pathology, Institute of Animal Breeding, University of Berne, 3012 Berne, Switzerland

Rapeseed presscake meal (15% in the ration) of 0-varieties or a control diet (soybean meal instead of rapeseed presscake meal) was fed without or with thyroxine for 9–10 wk to growing pigs. Pigs fed rapeseed presscake meal developed hyperplastic goiter. Blood serum free thyroxine concentrations in rapeseed presscake meal-fed pigs were depressed, normal in thyroxine-supplemented pigs fed rapeseed presscake meal and above normal in thyroxine-supplemented controls, but serum free triiodothyronine concentrations were comparable in all groups. Feed intake and average daily gain were reduced in pigs fed rapeseed presscake meal, independent of oral thyroxine intake. However, in an additional experiment, in which food intake was comparable because pigs were pair-fed, average daily gain was similar. The data indicate that reduced growth performance of rapeseed presscake meal-fed pigs was primarily the consequence of decreased feed intake and that hypothyroidism was of lesser importance.

KEY WORDS: • rapeseed meal • food intake • pigs • thyroid hormones

¹ Part of a thesis by C. Spiegel, accepted by the Veterinary Faculty of Berne, December 1991. Presented in part at the 43rd Annual Meeting of the Gesellschaft für Haustierphysiologie, April 1991, Giessen, Germany [Spiegel, C., Bestetti, G., Rossi, G. & Blum, J. W. (1991) Fütterung von Rapspresskuchenmehl und perorale Substitution mit Thyroxin bei Mastschweinen: Effekte auf Wachstum, Schilddrüse und Leber sowie hepatische 5'-Monodejodaseaktivität. J. Anim. Physiol. Anim. Nutr. 66: 181 (abs.)].

² Supported by a grant (no. 012.89.6) from the Swiss Federal Veterinary Administration.

³ The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 USC section 1734 solely to indicate this fact.

⁴ To whom correspondence should be addressed.

Manuscript received 30 December 1992. Revision accepted 20 May 1993.