PSII-1 Weaning as prenatal stress: preliminary study on indicators of calf resiliency
Notice bibliographique
Résumé
Abstract Maternal stressors have been reported to alter fetal development in many species. During pregnancy beef cattle are subjected to different potential stressors, such as weaning their current offspring, as part of beef production practices. The objective of this study was to investigate the relationship between weaning method as a prenatal maternal stress and the effect on offspring resiliency. Multiparous cows were weaned of their calves in the fall of 2022 using either abrupt (A), fenceline (F), or nose-flap (N) weaning methods (n = 30 per group). Calves born from these cows the following spring (2023) were followed for birthweights, morbidity, and mortality. Mean estimated fetal age at exposure was 126 d (range 66 to 219 d) using breed averages for gestational length. Cognitive tests were performed at 2 mo of age using an outdoor arena to continuously monitor calves during 2 min of initial isolation, 2 min exposed to a novel object, and 1 min of exposure to a human in the arena. Tests were performed sequentially, and treatments were balanced across days. Prenatal exposure to A was associated with a 74.8 (2.5 to 2,237.3, P < 0.01) and 21.5 (1.2 to 385.7, P = 0.03) times increase in the odds of calves being stillborn or failure to thrive within 24 h of birth compared with F or N, respectively. There was no difference in morbidity or mortality during d 1 to 60. Birthweights were available on one-half of the calves from each group and showed no statistical difference; however, there was a 4.53 kg numerical difference between A and N groups. Behavioral data from a subset of 36 calves (A = 14, F = 11, and N = 11) was assessed for time spent standing, moving, exploring, duration in the open center vs. perimeter of the arena. There was a tendency for A exposed calves to spend more time in the perimeter after being confronted with a novel object compared with N exposed calves (mean difference of percent of total test time in perimeter from isolation to novel object test: A = 24.0 ± 23.9 %, N = -2.9 ± 22.1 %, P = 0.08). Fenceline exposed calves spent more time moving during initial isolation than either abrupt or nose-flap (69.3 ± 14.7 %, 50.6 ± 11.9 %, and 69.9 ± 17.8 % for A, F, N, respectively (P = 0.01 for A vs F and F vs N). These behavioral and physiological indicators support a potential divergence in survivability and coping mechanisms associated with prenatal exposure to different weaning methods. Future research will evaluate different dimensions of cognitive performance as well as increasing sample size.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».