Under 664 is classed information about food and the food industry in general, especially the preparation of solid foodstuffs.
Produce of domestic animals and game, including milk, butter, cheese, eggs and meat, comes under 637/639. Cookery and meal preparation come under 641.
BS 1000[664]:1985 history
1985BS 1000[664]:1985 Universal Decimal Classification - English full edition - Preparation and preservation of solid foodstuffs