Relationship between reproductive management practices and fertility in primiparous and multiparous dairy cows
- PMID: 31308594
- PMCID: PMC6587879
Relationship between reproductive management practices and fertility in primiparous and multiparous dairy cows
Abstract
The aim of this study was to analyze the impact of reproductive management practices on fertility in primiparous and multiparous dairy cows and to identify the differences by parity. Data on reproductive performance and management of cows were gathered from 34 large commercial Holstein-Friesian dairy herds in Hungary. Individual data on 23 781 cows that calved in the studied herds in 2014 were collected from the national milk recording database and used to calculate the reproductive indices. Farm managers and veterinarians were interviewed in person from May 22 to November 6, 2015 using a questionnaire to collect information about reproductive management practices. The data were statistically analyzed by mixed-effects models. Our results showed that the use of a voluntary waiting period (VWP) was linked to a greater increase in calving-to-conception interval (CCI, P < 0.05) and a greater decline in the chance of pregnancy at 200 days in milk (P200, P < 0.001) in multiparous cows. Estrus synchronization was related to a larger reduction in days-to-first service (DFS, P < 0.001), breeding interval (IBI, P < 0.05), and CCI (P < 0.01) and a greater improvement in P200 (P < 0.001) in primiparous cows. Early pregnancy diagnosis and pregnancy recheck improved IBI (P < 0.01 for both practices), CCI (P < 0.01 and P < 0.001, respectively), and P200 (P < 0.001 for both practices) to a larger extent in primiparous than in multiparous cows. In conclusion, estrus synchronization, early pregnancy diagnosis, and pregnancy recheck led to a greater improvement in fertility in primiparous cows than in multiparous cows.
L’objectif de la présente étude était d’analyser l’impact des pratiques de gestion de la reproduction sur la fertilité de vaches laitières primipares et multipares et d’identifier les différences par parité. Les données sur les performances de reproduction et la gestion des vaches ont été amassées auprès de 34 fermes laitières Holstein-Friesian commerciales importantes en Hongrie. Les données individuelles de 23 781 vaches ayant mise-bas en 2014 dans les troupeaux à l’étude ont été obtenues de la base de données nationale d’enregistrement de la production laitière et furent utilisées pour calculer les indices de reproduction. Les gérants de ferme et les vétérinaires ont été interviewés en personne entre le 22 mai et le 6 novembre 2015 à l’aide d’un questionnaire pour obtenir des informations sur les pratiques de gestion de la reproduction. Les données ont été analysées statistiquement par des modèles à effets mixtes. Nos résultats ont démontré que l’utilisation d’une période volontaire d’attente (VWP) était liée à une plus grande augmentation de l’intervalle vêlage-conception (CCI, P < 0,05) et à un plus grand déclin de la probabilité de gestation à 200 jours en lait (P200, P < 0,001) chez les vaches multipares. La synchronisation des oestrus était reliée à une plus grande réduction du nombre de jours avant la première saillie (DFS, P < 0,001), de l’intervalle de reproduction (P < 0,05), et de CCI (P < 0,01), et une meilleure amélioration du P200 (P < 0,001) chez les vaches primipares. Des diagnostics de gestation hâtifs et des vérifications de la gestation ont amélioré IBI (P < 0,01 pour ces deux pratiques), CCI (P < 0,01 et P < 0,001, respectivement), et P200 (P < 0,001 pour les deux pratiques) d’une manière plus importante chez les primipares que chez les multipares. En conclusion, la synchronisation des oestrus, les diagnostics de gestation hâtif, et la vérification de la gestation ont conduit à une plus grande amélioration de la fertilité chez les vaches primipares que chez les vaches pluripares.(Traduit par Docteur Serge Messier).
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