Institutions No. of staff Proportional allocation Final sample size
Agricultural Research Center 270 70 102
National Veterinary Institute  215 55 81
Zuquala Steel Production Factory 200 52 76
Kalehiwot  Kuriftu Center  130 33 49
College of Veterinary Medicine 300 77 114
Total 1115 287 422
Table 1: Institutions versus distribution of individuals participated in the study.