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Pasture intake and milk production of dairy cows rotationally grazing on multi-species swards

Published online by Cambridge University Press:  07 March 2016

A. I. Roca-Fernández ,
J. L. Peyraud ,
L. Delaby  and
R. Delagarde
A. I. Roca-Fernández
Affiliation:
INRA, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35000 Rennes, France
J. L. Peyraud
Affiliation:
INRA, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35000 Rennes, France
L. Delaby
Affiliation:
INRA, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35000 Rennes, France
R. Delagarde*
Affiliation:
INRA, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35590 Saint-Gilles, France Agrocampus Ouest, UMR1348 Physiologie, Environnement et Génétique pour l’Animal et les Systèmes d’Elevage, F-35000 Rennes, France
*
† E-mail: remy.delagarde@rennes.inra.fr
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Abstract

Increasing plant species diversity has been proposed as a means for enhancing annual pasture productivity and decreasing seasonal variability of pasture production facing more frequent drought scenarios due to climate change. Few studies have examined how botanical complexity of sown swards affects cow performance. A 2-year experiment was conducted to determine how sward botanical complexity, from a monoculture of ryegrass to multi-species swards (MSS) (grasses-legumes-forb), affect pasture chemical composition and nutritive value, pasture dry matter (DM) intake, milk production and milk solids production of grazing dairy cows. Five sward species: perennial ryegrass (L as Lolium), white clover and red clover (both referred to as T as Trifolium because they were always sown together), chicory (C as Cichorium) and tall fescue (F as Festuca) were assigned to four grazing treatments by combining one (L), three (LT), four (LTC) or five (LTCF) species. Hereafter, the LT swards are called mixed swards as a single combination of ryegrass and clovers, whereas LTC and LTCF swards are called MSS as a combination of at least four species from three botanical families. The experimental area (8.7 ha) was divided into four block replicates with a mineral nitrogen fertilisation of 75 kg N/ha per year for each treatment. In total, 13 grazing rotations were carried out by applying the same grazing calendar and the same pasture allowance of 19 kg DM/cow per day above 4 cm for all treatments. Clover represented 20% of DM for mixed and MSS swards; chicory represented 30% of DM for MSS and tall fescue represented 10% of DM for LTCF swards. Higher milk production (+1.1 kg/day) and milk solids production (+0.08 kg/day) were observed for mixed swards than for ryegrass swards. Pasture nutritive value and pasture DM intake were unaffected by the inclusion of clover. Pasture DM, organic matter and NDF concentrations were lower for MSS than for mixed swards. Higher milk production (+0.8 kg/day), milk solids production (+0.04 kg/day) and pasture DM intake (+1.5 kg DM/day) were observed for MSS than for mixed swards. These positive effects of MSS were observed for all seasons, but particularly during summer where chicory proportion was the highest. In conclusion, advantages of grazing MSS on cow performance were due to the cumulative effect of improved pasture nutritive value and increased pasture DM intake that raised milk production and milk solids production.

Keywords

chicorygrass–legume mixturesgrazingmulti-speciesmilk production
Type
Research Article
Information
animal , Volume 10 , Supplement 9 , September 2016 , pp. 1448 - 1456
Copyright
© The Animal Consortium 2016 

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