Veterinary preparations for the reduction of methanogenesis in ruminants, for use in promoting well-being of animals in the nature of complementary and medicated animal feed, dietetic food and substances adapted for veterinary use, namely, dietary supplements for animals and medicated animal feed; dietary supplements for animals; preparations for gastrointestinal modification; veterinary preparations for gastrointestinal modification; veterinary and medical pharmaceutical preparations for the treatment of bacterial overgrowth; bacteriostats for medicinal, dental and veterinary use; veterinary and medical preparations for treatment, control, and modification of intestinal bacteria ; bacteriological preparations for medical and veterinary purposes; anti-bacteriological and antimicrobial preparations for medical and veterinary purposes; food supplements for veterinary purposes; pharmaceutical preparations for the treatment and modification of gastro-intestinal conditions; natural remedy preparations for the treatment and modification of gastro-intestinal conditions; biological preparations for the treatment and modification of gastro-intestinal conditions; gastro-intestinal treatment preparations; nutraceuticals for the treatment and modification of gastrointestinal flora; chemical preparations in the nature of powder and liquid form containing combinations of plant extracts, Allicin, garlic extracts, compounds extracted and derived from garlic and polyphenols for veterinary purposes; chemical reagents for medical purposes; chemical reagents for veterinary purposes; chemical preparations containing combinations of plant extracts, Allicin, garlic extracts, compounds extracted and derived from garlic and polyphenols for medical purposes, namely, for the reduction of methanogenesis in ruminants, and for use in promoting well-being of animals; chemico-pharmaceutical preparations for the reduction of methanogenesis in ruminants, the reduction of greenhouse gas emissions produced by ruminants, promoting the general well-being of animals in the nature of complementary and medicated animal feed; medicinal herbs; medicinal oils; parasiticides; plant extracts for nutraceutical use, namely plant extracts for promoting immune health and heart health in animals; plant extracts for dietetic use, namely, plant extracts for use for promoting immune health and heart health in animals; plant extracts for medical use; plant extracts for nutritional purposes for promoting immune health and heart health in animals