ATIVIDADA DA FAVELA on Instagram: "The video features a cannulated cow (also known as a fistulated cow), which is a cow that has undergone a surgical procedure to create a permanent "porthole" into its rumen, the largest of its four stomach compartments. This opening is sealed with a heavy-duty, flanged rubber device called a cannula that can be uncapped to provide direct access to the cow's digestive system. While visually shocking to many, this is a standard practice in agricultural science an