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Master Thesis

Étude de l’âge au premier vêlage des vaches laitières en Ille-et-Vilaine à l’échelle de l’animal et des élevages

Abstract : In dairy cattle farms, limit unproductive period of heifers by lowering age at first calving reduces the economic burdens allocated to them. With the aim of raising awareness among breeders on this issue, Eilyps, a dairy farms consulting company, wished to ensure that there was no adverse effect of a reduction in age at first calving on subsequent performances of dairy cows. For this, zootechnical performances of 30,000 Prim'Holstein cows have been analysed by variance analysis tests and logistic regressions. At career level, cows calving at 24 months have similar zootechnical performances to cows calving at 28 months. Cows calving at 24 months have better milk production and reproductive performances than cows calving at more than 32 months : 2,361 kg more milk produced on the career and shorter intervals between calving of 6 days. From a zootechnical point of view, reducing age at first calving is safe, but is it a priorityin all farms? Thanks to a hierarchical ascending classification, the different types of farms adhering to Eilyps have been characterized. Reducing age at first calving does not appear to be a priority in certain types of farms : farms with an economical feeding line based on grazing and farms where technical aspect is less controlled.
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Master Thesis
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Clémence Corre. Étude de l’âge au premier vêlage des vaches laitières en Ille-et-Vilaine à l’échelle de l’animal et des élevages. Sciences du Vivant [q-bio]. 2019. ⟨dumas-02364620⟩



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