Dogs were domesticated and fed meat scraps for thousands of years. First dog food was created by James Spratt in mid-1800s. US dog food market reached $23.3 billion by 2022
Rumen is the largest stomach compartment in ruminants. Composed of five muscular sacs with unique microbial communities. Outer epithelium serves as protective layer and metabolic processing. Inner lining contains papillae for nutrient absorption
Cat food was initially sold by London's Cat's Meat Men in 19th century. Specialized cat food came later than dog food due to cats' natural instincts. Gordon Stables recommended regular feeding and specific food types in 1876
Founded in 1907 as Hill Rendering Works in Kansas. Produced animal feed, tallow, hides and processed 500 horse weekly. Sold horse meat to Europe as Chopped and Cured
Omnivores regularly consume significant quantities of both plant and animal matter. They digest carbohydrates, protein, fat, and fiber from various food sources. Can incorporate algae, fungi, and bacteria into their diet
Animals are divided into six main groups: mammals, reptiles, birds, invertebrates, fish, and amphibians. Domestic animals are tamed for farming or kept as companions. Wild animals live in natural environments