Variability of cows milk productivity traits depending on origin of father and country of selection
Notice bibliographique
Résumé
A number of specialized dairy breeds of intensive type have been created in Ukraine, among which the Ukrainian black-and-white dairy farm occupies a prominent place. Currently, the improvement of this breed is carried out by using various breeding techniques with a focus on achieving maximum milk productivity of cows, improving milk quality, body type, health, stress resistance and prolonging productive longevity. The aim of the research was to investigate the formation of signs of milk productivity of cows depending on the origin of the father and the country of his selection. The researches have been conducted on bred heifers and mature cows (third lactation) of Ukrainian Black-and-White dairy breed in the State Enterprise "Alexandrovske" in Vinnytsia region. The traits of milk productivity (yields, fat content in milk and quantity of milk fat ) were studied for the last 10 years by retrospective analysis of bred heifers and mature cows (3-rd lactation), theoretically substantiated and proven feasibility of the study variability of these traits and their intergroup differentiation depending on the father’s origin and the countries of its selection, the consideration and application of which in the selection process will support creating of highly productive competitive herds of dairy cattle. The research showed the great influence of the origin of the father and the country of its selection on the variability of milk yield, fat content in milk and cows’ milk fat yield. It was found that the cows of the controlled herd were characterized by quite high indicators of milk productivity: the yields of bred heifers – 6115, mature cows - 6899 kg. The descendants of the bull Jorin 114414759 were the most productive during the first lactation (milk yield - 6936 kg, milk fat - 248.9 kg), and for the third - the daughters of the breeder Detective 349159846 (8148 and 295.2 kg respectively). The descendants of breeding bulls of German selection gave the most milk and milk fat quantity for the studied lactations (6269- 7014 and 224.8-250.3 kg, respectively). At the same time, the daughters of Canadian breeders gave the most fat- milk yield for the first lactation (3.66%), and for the third lactation – the daughters of the Dutch bulls (3.59%). Breeding bulls had a more significant influence on the traits of milk productivity (depending on lactation 13.1-31.8%), the country of their selection – much smaller (0.9-11.9%). In this regard, these factors had the greatest impact on milk yields, and the least - on the fat content in milk.
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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) | 0,000 | 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) | 0,000 | 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 ».