Developed by my (now former) lab this website has great information about how to assess dairy cattle welfare. This website contains very useful tools to help you to formally assess dairy cattle welfare.
My former lab mate, Gabbi Simon (now Global Animal Partnership), and my PhD mentor, Dr. Cassandra Tucker, developed a beautiful and very useful website full of tools to help you to formally assess cattle health and behavior, and stockperson handling. In addition, if you are a rancher, the website offers you other tools to apply it to your ranch.
This is a short list of places that offer scientific training on cattle welfare. This list came out based on my professional relationships with these groups, except for ETCO and LABEA. I expect to update this list soon.
LETA - Laboratório de Etologia Aplicada e Bem-estar animal, Universidade Federal de Santa Catarina Dr. L.C. Pinheiro Machado Filho & Dr. M.J. Hötzel
ETCO - Grupo de estudos e pesquisa em Etologia e Ecologia Animal, UNESP Jabotical Dr. M.J.R. Paranhos da Costa & Dr. A.C. Sant'Anna
LABEA - Laboratório de Bem-estar Animal, Universidade Federal do Paraná Dr. C.F.M. Molento