2. rumen stomach wall from inside to outside is the mucous membrane layer of submucosal tissue layer, myomembrane layer and the plasma membrane layer, of which the myomembrane layer is the most developed, by the inner circular muscle and outer longitudinal muscle two layers of smooth muscle, the layer is the main edible part of the tripe.

3. Bovine (Latin name: Bovine), belonging to the bovine family, a family under the subfamily Bovidae.

4. Chromosome number 56 of the bison, 60 of the cattle and 58 chromosomes of the cattle of the forehead, crossbreeding has fertile offspring, for mammals, prone to Robertson translocation (filament fusion) to change the number of chromosomes to reduce the fertility rate, herbivorous, and part of the species of livestock (including domestic cattle, cattle, buffalos, water buffalos and yaks).

5. Stout, some bulls have a pair of horns on the head.

6. Cattle help humans in agriculture.