CAB Abstracts and PubMed will be the most useful databases.
Before you begin your search:
CAB Abstracts is the most comprehensive database for veterinary medicine, animal science, and agriculture.CAB Abstracts indexes many U.S. and international publications, conference proceedings, and book chapters. The coverage is from 1910 to the present. Watch the short videos for an introduction to searching CAB Abstracts.
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PubMed indexes the health sciences/life sciences literature. It also indexes approximately 101 veterinary medicine journals. The coverage is from the 1950s to the present. Watch the short video for an introduction to searching PubMed.
Remember, PubMed does NOT index EVERY journal important to veterinary medicine. For example, Applied Animal Behavior Science, Bovine Practitioner, The Pig Journal, & the Journal of Swine Health & Production are NOT indexed by PubMed.
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Google Scholar can be a powerful (and familiar) tool to use for exploring the literature. It searches a very broad field of subject matter, but the results are also much more likely to include literature that is not peer-reviewed.