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| Rabbits (21) | Raccoons (3) | Radial Nerve (1) |
| Radiography, Abdominal (1) | Radiography, Thoracic (5) | Radioimmunoassay (6) |
| Radioimmunoprecipitation Assay (2) | Radioligand Assay (2) | Radiopharmaceuticals (3) |
| Radius Fractures (1) | Rain (1) | Random Allocation (12) |
| Randomized Controlled Trials as Topic (2) | Ranitidine (1) | Rats (22) |
| Rats, Inbred F344 (4) | Rats, Sprague-Dawley (14) | Reaction Time (2) |
| Reactive Oxygen Species (1) | Reagent Kits, Diagnostic (1) | Receptor, Parathyroid Hormone, Type 1 (1) |
| Receptors, Adrenergic, alpha-2 (1) | Receptors, AMPA (3) | Receptors, Antigen, T-Cell (1) |
| Receptors, Antigen, T-Cell, alpha-beta (1) | Receptors, Antigen, T-Cell, gamma-delta (1) | Receptors, Aryl Hydrocarbon (2) |
| Receptors, Cell Surface (2) | Receptors, G-Protein-Coupled (4) | Receptors, Glutamate (1) |
| Receptors, Glycine (1) | Receptors, Interleukin (1) | Receptors, Interleukin-12 (1) |
| Receptors, Interleukin-2 (4) | Receptors, Metabotropic Glutamate (1) | Receptors, N-Methyl-D-Aspartate (18) |
| Receptors, Nerve Growth Factor (1) | Receptors, Neuropeptide (1) | Receptors, Opioid (1) |
| Receptors, Progesterone (4) | Receptors, Prostaglandin (1) | Receptors, Tumor Necrosis Factor (1) |
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| Recombination, Genetic (4) | Records as Topic (5) | Recovery of Function (2) |
| Rectovaginal Fistula (1) | Recurrence (4) | Reference Standards (1) |
| Reference Values (23) | Refrigeration (2) | Regeneration (2) |
| Regression Analysis (5) | Regulatory Sequences, Nucleic Acid (1) | Rehydration Solutions (1) |
| Remission Induction (3) | Renin (1) | Renin-Angiotensin System (1) |
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| Replication Origin (1) | Repressor Proteins (3) | Reproducibility of Results (14) |
| Reproduction (6) | Research (1) | Respiration (5) |
| Respiratory Burst (1) | Respiratory Insufficiency (2) | Respiratory Mechanics (1) |
| Respiratory Mucosa (1) | Respiratory Syncytial Virus Infections (4) | Respiratory Syncytial Virus, Bovine (8) |
| Respiratory Syncytial Virus, Human (7) | Respiratory Syncytial Viruses (4) | Respiratory Tract Diseases (1) |
| Rest (1) | Restriction Mapping (3) | Rete Testis (1) |
| Retinoblastoma Protein (1) | Retinoid X Receptor alpha (1) | Retrospective Studies (36) |
| Retroviridae Infections (1) | Reverse Transcriptase Polymerase Chain Reaction (28) | Rhabdomyolysis (6) |
| Rhamnose (1) | Rhinitis (1) | rhoA GTP-Binding Protein (4) |
| Ribonucleoproteins (1) | Ribosomal Proteins (3) | Ribosomes (1) |
| Rickets (1) | Rifampin (1) | Risk Assessment (2) |
| Risk Factors (7) | Risk Management (1) | Rivers (2) |
| RNA (4) | RNA Splicing (3) | RNA, Antisense (3) |
| RNA, Bacterial (5) | RNA, Catalytic (1) | RNA, Fungal (1) |
| RNA, Messenger (37) | RNA, Neoplasm (1) | RNA, Protozoan (1) |
| RNA, Ribosomal (1) | RNA, Ribosomal, 16S (5) | RNA, Ribosomal, 18S (4) |
| RNA, Small Interfering (2) | RNA, Transfer (1) | RNA, Transfer, Met (1) |
| RNA, Viral (5) | RNA-Binding Proteins (1) | ROC Curve (2) |
| Rodent Diseases (2) | Rodenticides (1) | Rubber (1) |
| Rumen (7) | Ruminants (3) | Running (3) |
| Rupture (3) | Rural Population (2) | Rural Veterinary Practice ; Veterinary Workforce ; Rural Lifestyle ; Veterinary Mentorship (1) |
| Ryanodine Receptor Calcium Release Channel (1) | | |
