The effect of different cluster take-off levels at udder quarter in combination with feeding during milking on milk production in dairy cows : milk yield, milk composition and milking time
Notice bibliographique
Résumé
It was early stated that high take-off level at whole udder level decreases the milking time. There are, however, few studies dealing with take-off level at udder quarter level. It has also been stated that feeding of concentrate during milking can be used as a teaser to motivate the cows to visit the milking unit (MU) and to improve the milk ejection. Furthermore, has it been observed that milk yield can be negatively affected by high take-off levels but positively reinforced by feeding during milking. The aim of the present study was to evaluate different take off levels at udder quarter level in combination with or without feeding of concentrate during milking. The study was conducted at The Swedish Livestock Research Centre, Lövsta, Uppsala, Sweden, during November and December 2015. Thirty cows of the Swedish Holstein (n=9) and Swedish Red breeds (n=21) were used. Three different cluster take-off levels (100, 300 or 500g/min) on udder quarter level in combination with (f) or without feeding (nf) of concentrate during milking were tested in a six week long study in a 6x6 Latin Square model. It was found that milk yield was not affected by neither treatment, take-off level nor feeding of concentrate during milking, while milk composition was affected by both take-off level and feeding of concentrate during milking. Lactose and protein content was higher when concentrate was provided, while there was a tendency for lower fat content. The milking time was shorter with higher take-off level and when no concentrate was provided. Protein and lactose content was highest for take-off level 300 g/min, but also lower when no concentrate was provided during milking. Percent of residual milk was highest in treatment 300f while lowest for 100f and 300nf. The present study therefore suggests that a take-off level at 500 g/min in combination with no concentrate during milking is appropriate to ensure a sufficient udder empting and possible improvement of milking efficiency, with a low effect on milk composition and no effect on milk yield.
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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 | 0,002 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| 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 ».