Rumination in cattle is a digestive physiological phenomenon unique to cattle

Rumination in cattle is a digestive method unique to cattle and other ruminants, commonly known as chewing the cud. When cattle eat, they often swallow hastily; the food first enters the rumen, where it is soaked, softened and initially fermented, and during rest it is returned to the mouth in a bolus to be chewed thoroughly, mixed with saliva, and then swallowed again into the subsequent digestive tract. The stomach of cattle is divided into four parts: the rumen, reticulum, omasum and abomasum, among which the rumen has the largest capacity and is the main site of rumination and fermentation.

Rumination usually takes place when cattle are resting quietly, and a considerable part of the day is spent repeatedly chewing. The large amount of alkaline saliva secreted during chewing can neutralize the acid produced by fermentation in the rumen and help maintain the stability of the rumen environment. The rumen also harbours a large number of microorganisms that can break down the crude fibre in pasture grass and straw into nutrients that cattle can absorb and utilise, which is precisely why cattle can grow on grass alone.

The state of rumination is also an important indicator for judging whether cattle are healthy or not. Healthy cattle ruminate regularly; if cattle are found to ruminate less, weakly, or to stop completely, it often indicates problems such as rumen impaction, rumen bloat, digestive disorders or fever, and the cause needs to be identified promptly. Experienced farmers therefore often make observing rumination part of their daily management.

In feeding, ensuring sufficient high-quality roughage and keeping forage at an appropriate length helps cattle ruminate normally. If too much concentrate and insufficient roughage are fed over a long period, problems such as rumen acidosis are easily triggered, affecting rumination and digestive function, so special attention should be paid to the balance of concentrate and roughage in production.