Effects of omitting one udder quarter at one single milking : on milk production and SCC in mid and late lactating cows with or without re-sorting for a second milking
Notice bibliographique
Résumé
The aim of this study was to investigate if one single omitted milking on one udder quarter with or without re-sorting affects milk yield and udder health in cows in mid or late lactation. The study was carried out in an automatic milking rotary (AMR). It is an identified problem in automatic milking that one or more udder quarters are incompletely milked due to failed teat cup attachment or cows kicking teatcups off. At present, cows that are registered as incompletely milked on one udder quarter or more in the AMR used in this study are resorted for a second milking since it has been shown that extended milking intervals in early- and mid-lactation can lead to a decrease in milk yield and also cause an elevated somatic cell count (SCC) which is an indicator of impaired udder health. Resorting reduces the capacity of the AMR and for the individual cow resorting leads to more time away from feed and cubicles which can impair cow welfare or milk production or both. 36 cows of Swedish Holstein and Swedish Red Breed in day 167 to 376 in lactation were used in the experiment and were divided into two groups, control and treatment. All cows were subjected to one udder quarter being omitted at one milking. After the omitted milking, control cows were resorted back for a second milking while treatment cows were directed to exit. Composite milk and udder quarter milk sampling was performed for three days before and ten days after the treatment day and used for determination of SCC, lactose, milk fat and milk protein. In addition, milk yield was registered throughout the experiment period. Milk yield was 3.7kg lower on the treatment day but no negative long-term effect on milk yield or SCC was found. Furthermore, milk yield from the omitted teat was low on resorting, indicating that a resorting likely does not lead to a complete emptying of the omitted quarter. Therefore, it was concluded that a cow in mid or late lactation has no beneficial effects of being resorted for a second milking in an AMR. A cow can instead the allowed to return to feeding and cubicles after a single incomplete milking, allowing a higher capacity of the AMR. Effects of incomplete milking in early and peak lactation and repeated incomplete milking in any stage of lactation remain to be studied.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| 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) | 0,000 | 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 tête enseignante, 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 ».