The Rumen Is a Fermentation Vat, Not a Stomach
Cattle are ruminants, which means digestion begins not in an acid stomach but in a four-chambered system where the first and largest chamber, the rumen, holds between 100 and 150 litres of fermenting ingesta in an adult cow. Billions of microbes, bacteria, protozoa, and fungi, break down cellulose that a single-stomached animal cannot touch. Dry grass, straw, sugarcane bagasse, the coarse outer leaves of maize: the rumen handles all of it through continuous microbial fermentation, producing volatile fatty acids that the animal absorbs as its primary energy source. The rumen wall contracts rhythmically, roughly once a minute, to mix the contents and push material toward the reticulum. This is the biological context in which festival waste lands.
