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Conference papers

Effets favorables de l’introduction de graines de lin extrudées dans la ration sur la production de lait et la reproduction des vaches laitières

Abstract : The objective of this unexposed-exposed retrospective study was to quantify the effects of using extruded linseed (GLE) on animal performance in field conditions. In the absence of knowledge on the exact composition of diets, the measure of GLE exposure was approximated by estimating a daily quantity distributed on the basis of information from deliveries made by 22 companies between 2008 and 2015 in France. On farms using GLE, cows exposed to GLE (with 4 levels of exposure, from 30 g to 800 g / day) and cows not exposed to GLE (reference population) were distinguished. Reproductive performance was studied in 423,605 artificial inseminations (AI) from 158,125 cows in 1,096 herds using Cox models for postpartum intervals and logistic regression for fertility. Dairy performance was studied on 1,997,763 dairy controls from 194,056 cows in 1,291 herds using linear models with an autoregressive covariance structure of order 1. To correctly estimate the effect of exposure, all models were adjusted for known variation factors of the performance and for a random herd effect. Exposure to GLE was associated in a dose-response manner with an improvement in milk production (+ 0.4 to + 1.3 kg / day according to parity), and a slight reduction in the levels of milk solids (-0.03 to -0.20 g / kg of PC and -0.1 to -0.9 g / kg of FC according to parity). The days-open was significantly lower in cows that received GLE since calving than in those that did not (ranging from -2.9 to -6.6 days depending on the level of GLE exposure) without any effect on fertility. This epidemiological study has shown that, on average, farmers derive benefits on the herd's performance from the intake of modest amounts of GLE
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Submitted on : Tuesday, June 2, 2020 - 1:32:19 PM
Last modification on : Thursday, January 13, 2022 - 4:50:24 AM

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  • HAL Id : hal-02734181, version 1
  • PRODINRA : 464789

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Thomas Meignan, Aurélien Madouasse, François Beaudeau, Cyril Lechartier, Guillaume Chesneau, et al.. Effets favorables de l’introduction de graines de lin extrudées dans la ration sur la production de lait et la reproduction des vaches laitières. 24. Rencontres Recherches Ruminants (3R), Dec 2018, Paris, France. ⟨hal-02734181⟩

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