PSXI-9 Using growth implants in suckling beef calves enhances their growth performance and hematological responses.
Notice bibliographique
Résumé
Abstract This study evaluated growth performance and hematological parameters during two consecutive years in beef calves under two different implant treatments. Each year, 90 crossbred beef calves (121 ± 19 kg body weight (BW) and 74 d of age; Year 1 and 137 ± 17 kg BW and 73 d of age; Year 2) were stratified by birth BW and age. Then, animals were randomly assigned to 1 of 3 treatments (30 per treatment/year) in a randomized complete block design: Synovex C (SC; 100 mg progesterone and 10 mg estradiol benzoate), Synovex One Grower (SG; 150 mg trenbolone acetate and 21 mg estradiol benzoate), or no implant (CON). On the day of treatment implantation (day 0) and during weaning (WN), calves received a vaccination protocol that included Bovi-Shield Gold One Shot® and Ultrabac® 7. During that period, calves were managed in a grazing system along with their dams in a single pasture. After WN, calves were placed in a single pen and given ad libitum access to a total mixed ration until 60-d post-weaning (d-60PWN). Body weight for performance and blood samples for complete blood count were collected on d 0, WN, d 14-d post-weaning (d-14PWN) and d-60PWN. A treatment × day interaction was observed for leukocytes (P = 0.03), with SG having lower concentrations at WN compared with SC while CON calves were intermediate. No other differences in treatment were detected for blood parameters (P ≥ 0.05). In Year 1, hematocrit (P = 0.01), mean corpuscular volume (P = 0.0001), and mean corpuscular hemoglobin concentrations were higher than in Year 2 (P < 0.0001). Average daily gain (ADG) was greater from d 0 to WN (P = 0.02) and from d 0 to d-60PWN (P < 0.0001) for SG and SC calves compared to CON calves. However, from WN to d-60-PWN, there was a difference in ADG (P = 0.02), with SG calves outperforming the CON group, while SC calves did not differ from both groups. Differences in BW were noted on d 14, with the SC group showing greater BW (P = 0.04) than the CON, while the SG group was intermediate. At WN and d-60PWN, the SG and SC calves were heavier (P = 0.0004) than the CON calves. In conclusion, calves implanted with SG appear to experience less stress during weaning, as indicated by lower leukocyte counts. The fluctuations in hematological values observed during the first year compared to the second year may be influenced by environmental, animal, and management factors. Additionally, the implantation of suckling beef calves improved growth performance pre- and post-weaning, with the SG group showing a notably stronger performance response.
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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 | 0,000 | 0,000 |
| 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 ».