Effects of feeding extruded linseed on milk production and composition in dairy cow: a meta-analysis - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2017

Effects of feeding extruded linseed on milk production and composition in dairy cow: a meta-analysis

Résumé

The objectives of this study were to quantify the effects on production performance and milk fatty acid (FA) profile of feeding dairy cows extruded linseed (EL), a feed rich in x-linolenic acid, and to assess the variability of the responses related to the dose of EL and the basal diet composition. This meta-analysis was carried out using only data from trials including a control diet without fat supplementation. The dependent variables were defined by the mean diffrences between EL supplemented groups and control groups. The data were processed by multivariable regression testing the effect of each potential interfering factor associated with the dose effect, and then stepwise regression with backward elimination procedure with all potential interfering factors retained in previous steps. This entire strategy was also applied to a restricted dataset including only trials conducted within a practical range of fat feeding (only supplemented diets with less than 60 g fat/kg DM and supplemented with less than 600 g fat from EL). The whole dataset consisted of 17 publications representing 21 control diets and 29 EL supplemented diets. The daily intake of fat from EL supplementation ranged from 87 to 1,194 g/cow/d. No effect of dose or diet was identified on dry matter intake, milk yield or milk protein content. Milk fat content decreased when EL was supplemented to diets with a high proportion of corn silage in the forage (-2.8 g/kg between low and high corn silage-based diets in the restricted dataset) but did not decrease when the diet contained alfalfa hay. Milk trans-10 18:1 proportion increased with EL supplementation in interaction with corn silage proportion in forage. A shift in ruminal biohydrogenation pathways, from than-11 18:1 to trans-10 18:1, probably occurred when supplementing high dose of EL with high corn silage-based diets, related to a change in the activity and/or composition of the microbial equilibrium in the rumen. Finally, EL supplementation increased linearly proportions of potentially human health-beneficial FA in milk
Fichier non déposé

Dates et versions

hal-01607619 , version 1 (03-10-2017)

Identifiants

  • HAL Id : hal-01607619 , version 1
  • PRODINRA : 406058

Citer

Thomas Meignan, Cyril Lechartier, Guillaume Chesneau, Nathalie Bareille. Effects of feeding extruded linseed on milk production and composition in dairy cow: a meta-analysis. 68. Annual Meeting of the European Federation of Animal Science (EAAP), Aug 2017, Tallinn, Estonia. 514 p. ⟨hal-01607619⟩
247 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More