Table 6.
Intervention methods investigated and the number of successful and unsuccessful outcomes after the intervention had been applied.
| Interventions | # of Articles 1 | Successful | Unsuccessful |
|---|---|---|---|
| Straw Bedding/Rooting Substrate | 22 | 17 | 5 |
| Enrichment (Rope, Jute Sack, Wood, etc.) | 12 | 8 | 4 |
| Tail Length (Tail-Docking vs. Intact Tails) | 11 | 9 | 2 |
| Rearing Facility (Flooring, Enriched, etc.) | 10 | 6 | 4 |
| Stocking Density | 8 | 4 | 4 |
| Single-Sex Pens vs. Mixed-Sex Pens | 4 | 1 | 3 |
| Time that Enrichment Provided | 4 | 1 | 3 |
| Diet Type (Commercial vs. Specialty) | 3 | 1 | 2 |
| Pig Grouping (Litter mates, Tail-Biting Category) | 3 | 0 | 3 |
| Stress (ACTH Levels, Stimuli, R/I Test, etc.) | 3 | 2 | 1 |
| Feeding Frequency and Style | 2 | 1 | 1 |
| Advice from Veterinarians | 2 | 2 | 0 |
| Air Velocity and Direction | 1 | 0 | 1 |
| Identify Tail-Biters Early (Rope/Chew test) | 1 | 0 | 1 |
| Healthy vs. Ill Pigs | 1 | 0 | 1 |
| Number of Pigs per Feeder Space (Feeding Trough Density) |
1 | 0 | 1 |
| Tail-Biting Deterrent (Oil, Tar) | 1 | 1 | 0 |
| Teeth-Clipping | 1 | 1 | 0 |
1 Possible for the same publication to have had more than one (1) intervention applied. Fifteen (15) studies applied more than one (1) intervention.