Potential Sources Of Biases In A Population-Based Survey Of Dairy Reproductive Management Practices

Abstract

In a questionnaire survey of dairy reproductive management practices among 234 dairy farmers of Tulare County, California, a response rate of 93.16% was achieved. Based on the forms of contact with the farmers, three groups of respondents, early, middle and late, were identified. Comparisons among the gro~ps indicated the three were different on several management variables. These differences are potential sources of biased variable estimates for the Tulare general population of 234 dairy farms if the results from only a subset of respondents were utilized