Endometrial samples from 39 clinical cases and 18 slaughtered cows wer
e collected by Nielson's biopsy cathetor. These samples revealed acute
and sub-acute inflammation of uterus in 90 and 10% samples, respectiv
ely, in repeaters with normal discharge, whereas in cows with abnormal
discharge the corresponding percentage was 10 and 40 with 50% showing
chronic form of endometritis. Occurrence of acute, sub-acute and chro
nic forms of endometritis in 18 sterile cows was 22.22, 27.78 and 50.0
0%, whereas all the control animals did not show any inflammatory chan
ges in the biopsy materials.