Funding for this research was provided by:
The Norwegian research funding for agriculture and the food industry (268023)
Received: 24 November 2020
Accepted: 28 April 2021
First Online: 6 May 2021
: The study did not involve procedures that necessitate application for ethics approval through the National Animal Research Authority in Norway. This study included no sensitive information that could be traced to individual producers, so ethics approval was not necessary.
: In the questionnaire, respondents were informed that all information would be treated confidentially and that the producers, by returning the questionnaire, accepted publication of the results.
: The authors declare that they have no competing interests,