1. OIE—Terrestrial Animal Health Code—19/07/2021 Chapter 7.1.—Introduction to the Recommendations for Animal Welfare
https://www.woah.org/fileadmin/Home/eng/Health_standards/tahc/current/chapitre_aw_introduction.pdf
2. Terrestrial Animal Health Code Chapter 7. 12
https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/
3. Council Directive 98/58/EC of 20 July 1998 Concerning the Protection of Animals Kept for Farming Purposes. Official Journal of the European Communities
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:31998L0058
4. Council Directive 2008/119/EC of 18 December 2008 Laying down Minimum Standards for the Protection of Calves. Official Journal of the European Communities
https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A32008L0119
5. Council Directive 2008/120/EC of 18 December 2008 laying down minimum standards for the protection of pigs. Official Journal of the European Communities
https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A32008L0120