In the digestive system of cattle, the pH of the stomach and small intestine is relatively low, while the pH of the large intestine and rectum is relatively high. The following are specific data:

1. Small intestine: The small intestine is the main absorptive organ in the cattle digestive system. The pH of the jejunum and duodenum is relatively low, generally between pH6-7.

2. Large intestine: The large intestine is the main water and electrolyte absorption organ in the cattle digestive system. Its pH is relatively high, generally between pH7-8.

3. Rectum: The rectum is the last part of the cattle digestive system and is mainly responsible for the storage and excretion of feces. Its pH is relatively high, generally between pH7-8.