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Sources of Unidentified Growth Factors for Baby Pigs¹

Iowa Agricultural and Home Economics Experiment Station^{,4, 5,}, Ames

Abstract

Five experiments involving 472 baby pigs were conducted to study the growth promoting activity of various crude sources of unidentified growth factors. The optimum level of distillers dried solubles (DDS) was approximately 5% of the total diet, and a portion of this growth response could be attributed to the ash of DDS. The inclusion of trace elements (iron, copper, cobalt, manganese and zinc) in the diet did not appreciably affect this response. Impaired performance resulting from the inclusion of iodinated casein in the diet was not overcome by the inclusion of DDS or corn steepwater but was partially overcome by the addition of fish solubles.

Fish solubles at increasing levels (0 to 6%) produced a linear improvement in 4-week gain and feed conversion. Corn steepwater and corn fermentation solubles did not improve performance.

¹ Journal Paper No. J-3937 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 959.

² Present address: Boswell Company, Litchfield Park, Arizona.

³ Present address: Walnut Grove Products Co., Atlantic, Iowa.

⁴ Department of Animal Husbandry.

⁵ This research partially supported by grants-in-aid and material from Distillers Feed Research Council, Cincinnati, Ohio and Clinton Corn Processing Company, Clinton, Iowa.