Richert, B.T.; Tokach, M.D.; Goodband, R.D.; Nelssen, J.L.
(Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1993)
A total of 650 questionnaires were sent to Kansas swine producers, and 279 were returned. There was an excellent distribution
in producer size based on number of pigs marketed per year and producer age and educational ...