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Modélisation individuelle de la reproduction des vaches Holstein intégrant les effets de la production laitière et des réserves corporelles

Abstract : Reproduction is a key-driver of milk productivity and herd demography. The decline in reproductive performance over the last decades has decreased the life span of cows and increased the length of lactation. This performance is affected by variations in milk yield and body condition score, which in turn are influenced by herd management, in particular feeding management. Individual-based herd simulation models enable the simulation of the consequences of different management strategies on dairy herd performance and the assessment of its variability. A dynamic and stochastic individual reproduction model was developed for the Holstein breed from data from a recent experiment. This model covered the whole reproductive process and was composed of a succession of discrete events, namely calving, ovulations, conception and possible pregnancy interruption. Each stage in reproduction was affected by milk yield, body condition or their changes. The model takes into account recent evolutions in reproductive performance, in particular concerning cyclicity (frequency of abnormalities, cycle length), poor oestrous expression and fertility parameters (fertilisation failure or early embryonic loss, late embryonic loss). The sensitivity of the model to milk yield and body condition score at calving was tested. The simulated calving interval and re-calving rate were consistent with the reproductive performance observed in French Holstein herds. This model could be used in herd simulation models to test the effects of management strategies (feeding and reproductive management) on herd production and demography.
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  • HAL Id : hal-02745499, version 1
  • PRODINRA : 276440

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Laure Brun-Lafleur, Erwan Cutullic, Philippe Faverdin, Luc Delaby, Catherine Disenhaus. Modélisation individuelle de la reproduction des vaches Holstein intégrant les effets de la production laitière et des réserves corporelles. 18. Rencontres autour des Recherches sur les Ruminants, Dec 2011, Paris, France. ⟨hal-02745499⟩

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