Cows (2) virus (1) maladie respiratoire (1) région (1) association (1) infection (1) analyse (1) ADN (1) maladie (1) bovins (1) analyse (1) bétail (bovins) (1) Discipline (1) Diagnosis (1) Employment (1) Reproduction (1) Birthplace (1) Diseases (1) Observations (1) Observations (1) Canadian provinces (1) Genes (1) Veterinary medicine (1) Time (1) Thymidine (1) Teaching (1) Teachers (1) Synchronization (1) Social groups (1) Signs and symbols (1)