My dear little goats and I are developing a nice bond. I sit and observe them any moment I have spare. I have come to understand the process of rumination or chewing the cud. Ruminants are herbivores and sit down several times a day to ruminate.
The primary difference between a ruminant and non-ruminant is that ruminants have a four-compartment stomach. The four parts of the stomach are the rumen, reticulum, omasum, and abomasum. In the first two chambers, the rumen and the reticulum, the food is mixed with saliva and separates into layers of solid and liquid material. Solids clump together to form the cud or bolus.
The cud is then regurgitated and chewed to completely mix it with saliva and to break down the particle size. Fiber, especially cellulose and hemi-cellulose, is primarily broken down in these chambers by microbes (mostly bacteria, as well as some protozoa, fungi and yeast) into the three volatile fatty acids (VFAs), acetic acid, proprionic acidand butyric acid. Protein and non-structural carbohydrate (pectin, sugars, starches) are also fermented. source wikipedia
Here is Erik and Claude ruminating. You can see Erik regurgitate and swallow.