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Economic and Technical Aspects of Feeding Whey to Livestock^{1 ,2,}

Food Research Institute, Research Branch, Canada Department of Agriculture, Ottawa, Ontario K1A 0C6 Canada

P. G. Muller

INMARINT (International Marketing and Investment Ltd.), 120 Holland Avenue Ottawa, Ontario K1V 0X6 Canada

J. T. Elliot

Animal Research Institute, Research Branch, Canada Department of Agriculture, Ottawa, Ontario K1A 0C Canada

D. B. Emmons

Food Research Institute, Research Branch, Canada Department of Agriculture, Ottawa, Ontario K1A 0C6 Canada

ABSTRACT

Approximately 500 million kg or 36% of the whey produced in 1978 in Canada was discarded by dumping in sewers, ditches, streams, or spraying on fields. Eighty percent of the whey originated in Ontario and Quebec with smaller factories having the most serious problems. Hauling whey to central processing plants is not economical because of distances.

The economic and technical aspects of feeding whey to livestock, particularly swine, were investigated to determine benefits of substituting whey for part of the diet. Three models at moderate, medium, and advanced degrees of efficiency were established to determine economic benefits of feeding whey. Increased profits of whey feeding over dry feeding ranged from approximately $11 to $17 per hog, depending upon the efficiency of operation, or $27 to $51 per hog place per year. At 30% substitution, whey will replace approximately 70 kg of swine ration per hog.

Whey feeding results in multiple benefits in feed value, improved carcass quality, and additional manure credit. The direct monetary benefits can amount to 6.8 million dollars per year in Canada.

Considerably larger additional benefits, however, would accrue to the dairy industry in savings from elimination of purchases for sophisticated pollution control equipment or heavy levies for the sewage treatment of whey; savings could amount to $15 to 17 million per year.

¹ Contribution No. 392 Food Research Institute, Agriculture Canada, Ottawa, Ontario.

² Contribution No. 874 Animal Research Institute, Agriculture Canada, Ottawa, Ontario.