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Self-Selection of Feeds and Water by Unbred Gilts

Agriculture Canada^{1, 2,} Ottawa, Ontario K1A OC6

Abstract

The pattern of voluntary feed and water intakes by nine unbred Yorkshire gilts, selected at about 125 kg body weight, was recorded for an experimental period of 22 weeks. The gilts increased body weight and showed some sustained change in dry matter (P < .05) and water intakes. Periodic depressions in these intakes were found to be coincident (P < .01) with estrus. Increases in depth of back-fat were not unlike those expected to occur in pregnant gilts treated similarly. The average intake of crude protein was 445 g daily. Dry matter from the protein feed source, as a proportion of total DM intake, appeared to increase steadily (P < .01) throughout the experiment.

¹ Contribution No. 464, Animal Research Institute.

² Care of animals was by N.W. Lynch, statistical assistance by Dr. D. T. Spurr and preparation of figures by Graphics Unit, Research Branch, Agriculture Canada.