Effects of social stress on heart rate and heart rate variability in growing pigs
Bibliographic record
Abstract
The effects of social stress on heart rate, heart rate variability and the occurrence of cardiac arrhythmias were studied in 12 growing pigs. Social stress was induced during a good competition test with a pen mate, and subsequently during a resident–intruder test with an unacquainted pig in which the experimental pig was the intruder. The outcome of a test was determined using observations of agonistic behaviour. Five pigs won the food competition test. All pigs were defeated in the resident–intruder test with an unacquainted pig. For all pigs, heart rate was significantly higher and thus the R-R interval significantly lower during the food competition test and resident–intruder test than during baseline recordings. However, pigs that were first defeated in the food competition test had a higher heart rate during the first 7 min of the resident–intruder test than winners of the food competition test. Parameters of heart rate variabiality did not significantly change during the food competition test and the resident–intruder test relative to baseline recordings. Thus, the parasympathetic and the sympathetic nervous system remained in balance during the social stress situations. This may explain why the occurrence of cardiac arrhythmias did not increase during the food competition test and the resident–intruder test relative to baseline. We showed that social status, based on agonistic encounters during the food competition test, may influence the heart rate responses of pigs during the resident–intruder test. When heart rate is used as an index of stress, results indicate that subordinate pigs may experience more stress during an agonistic encounter with an unacquainted pig than dominant pigs. Key words: Behaviour, heart rate, social stress, telemetry, pigs
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".