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Influence of an Experimental Infection of Swine Kidneyworm (Stephanurus Dentatus) on Performance of Pigs

University of Georgia, Coastal Plain Station⁴, Tifton 31793

Abstract

Forty pigs (average 25.2 kg live weight) were individually housed and fed to study the effect of a single infection of Stephanurus dentatus (either 0, 72, 457 or 842 S. dentatus larvae/kg body weight) on performance of growing-finishing pigs. Final weight and average daily gain were depressed (P<.05) by increasing levels of kidneyworm infections. Average daily gain of pigs not infected was 69% greater (P<.05) than that of pigs given 842 S. dentatus larvae/kg body weight. Feed to gain ratios of pigs were increased linearly (P<.05) with increasing levels of kidneyworm larvae. Feed to gain ratio for pigs not infected was 24% less (P<.05) than that for pigs given 842 kidneyworm larvae/kg body weight. In each of two trials, eight crossbred barrows (average 26.0 kg in trial 1 and 22.6 kg body weight in trial 2) were examined for the effects of two levels of kidneyworm infections (0 and 457 larvae/kg body weight) on digestion and absorption of nutrients and on N balance. Digestion coefficients for dry matter, crude protein and energy for pigs not infected and for those experimentally infected were similar (P>.05). Pigs not infected had higher (P<.01) N intakes, excreted more (P<.05) N in feces and urine and had a higher (P<.01) N balance than pigs infected with kidneyworms, due largely to difference in feed intake.

¹ Dept. of Anim. Sci.

² Present address: Southern Grain Insect Res. Lab., USDA/ARS, Tifton, GA 31793.

³ Reference to a company or product name does not imply approval or recommendation of the product by the USDA to the exclusion of others that may be suitable.

⁴ Supported by State and Hatch funds allocated to the Georgia Agr. Exp. Sta.

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