Below are some of the things you should look out for in a ruminant before purchasing them.
When you want to purchase a male ruminant for instance, the general health status of the animal must be critically examined. The animals must be free of ectoparasites and any physical deformity. Ruminants with any sign of ill-health must not be bought. For male check the testicles to be sure you are not buying a castrated animal. The animal must have well developed muscles and hind limbs so as to make mounting of female animal easy.
For the female, take proper reproductive rate of the parents, reproductive interval, incidence of abortion or any related reproductive problem etc. in general, it is better an expert is carried along before any selection is done so as to avoid unnecessary problems.
See also: Risks in Purchasing a Pregnant Cow