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Poster communications

Effect of cow type and feeding strategy on grazing time in simplified rotational grazing systems

Abstract : Grazing time (GT) is one component of grass intake and varies with animal and sward characteristics. The objective of this experiment was to describe the effect of breed (Holstein vs Normande) and parity (primiparous vs multiparous) on grazing time within simplified rotational grazing systems. Two groups of cows corresponding to two long-term feeding strategies grazed separately. One group (High – H) received 4 kg d‑1 of concentrate while the other (Low – L) received no supplement. Daily grazing time was measured with Lifecorder technology on 30 dairy cows (15 H and 15 L) during 5 grazing sequences (2 H and 3 L) varying between 7 and 13 days of paddock residence depending on grass availability. On average, the daily paddock access time was 1,155 min and grazing time was 530 min. Parity had no significant effect on GT. Holstein cows grazed for an additional 27 min compared with Normande cows. Grazing time was reduced with concentrate allocation, by 10 min for each 1 kg of concentrate intake. Within a paddock, the GT varied with a regular increase during the residency period. This experiment confirms the large variation in GT between cows and also with the grazing conditions.
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Poster communications
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https://hal.inrae.fr/hal-03040333
Contributor : Emilie Bernard <>
Submitted on : Friday, December 4, 2020 - 11:54:44 AM
Last modification on : Tuesday, May 11, 2021 - 3:11:48 PM

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  • HAL Id : hal-03040333, version 1

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Luc Delaby, François Launay, P. Dodin, Remy Delagarde. Effect of cow type and feeding strategy on grazing time in simplified rotational grazing systems. 28. General Meeting of the European Grassland Federation (EGF), Oct 2020, Virtual meeting, Finland. Wageningen academic publishers, Grassland Science in Europe, 25, pp.237-239, 2020, Meeting the future demands for grassland production. Proceedings of the 28th General Meeting of the European Grassland Federation. ⟨hal-03040333⟩

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