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Self-Selection of Feeds and Water by Swine during Pregnancy and Lactation

Canada Department of Agricultural,³

Abstract

THE technique of self-selection of feeds was used extensively by Richter and Barelare (1938) to show that the feed intake of rats could be reduced by about 20% during pregnancy and almost 50% in lactation compared with a regimen in which rats were fed a complete, stock diet. The smaller feed intake was thought due to a satisfaction of specific needs without an obligation to ingest large amounts of other, unneeded nutrients.

Evvard (1914) originated the "free-choice" system of feeding pigs based on corn, protein supplement (meat meal) and minerals. Recently, Owen and Ridgman (1968) demonstrated the development of a compensatory response by pigs fed low energy diets which resulted in similar digestible energy intakes, and Henry and Rerat (1968) reported that, similarly to the rat, the pig adjusts its energy intake according to protein intake, or more precisely, to the gain of weight allowed by the protein intake. Devilat et al. (1969) have shown that pigs can preferentially select an amino-acid balanced diet.

¹ Present address: Animal Research Institute, Canada Department of Agriculture, Ottawa 3, Ontario.

² The author wishes to acknowledge the care of experimental animals by B. A. Targett and the preparation of figures by Bio-graphic Unit, Canada Department of Agriculture.

³ Research Station, Fredericton, New Brunswick.