Logistic regression results for practitioner characteristics associated with reporting concern over the prescription of hormones to assist breeding.

+ The full list of covariates available is provided in Appendix S2.*fixed-time artificial insemination to be used if a cow has not been inseminated by some defined point after calving, but not as soon as she is eligible to be bred from.可用协变量的完整列表详见附录S2。*定时人工授精（fixed-time artificial insemination）：若奶牛在产犊后某一预设时间节点仍未完成授精，则可采用该方案，但不可在其刚具备配种资格时就使用。