Models for predicting effects of management factors on per-cow and per-hectare pasture intake by grazing dairy cows
| Autor: | Allain, C., Raynal, J., Beck, C., Delagarde, Remy, Brocard, V. |
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| Přispěvatelé: | Institut de l'Elevage, Department of Farm Systems, Wageningen University and Research Centre [Wageningen] (WUR), Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), AGROCAMPUS OUEST-Institut National de la Recherche Agronomique (INRA), Institut de l'élevage (IDELE), Wageningen University and Research [Wageningen] (WUR), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Grassland and forages in high output dairy farming systems. (20)2015; 18. Symposium of the european grassland federation, Wageningen, NLD, 2015-06-15-2015-06-17, 166-168 Grassland and forages in high output dairy farming systems 18. Symposium of the european grassland federation 18. Symposium of the european grassland federation, Jun 2015, Wageningen, Netherlands. Wageningen Academic Publishers, 20, 2015, Grassland Science in Europe 18. Symposium of the european grassland federation, Jun 2015, Wageningen, Netherlands. Wageningen Academic Publishers, Grassland Science in Europe, 20, 2015, Grassland Science in Europe |
| Popis: | The Lifecorder+® is a uniaxial neck-mounted activitymeter. It was tested to assess grazing time in two French experimental automatic milking system farms (20 cows equipped on the Derval farm, 14 cows equipped on the Trévarez farm). The Lifecorder+ raw signal (from 0 to 9) was converted into a grazing yes/no information over a certain threshold. The data from the sensors were compared with visual observations as reference: trained observers recorded activity with a scanning every 10 minutes in the pastures. The recorded activities were as follows: grazing/ruminating and standing/lying/walking. Observation sessions were performed on the Derval and Trévarez farms. Finally, 20 recordings were available for the Derval farm (121 h of cumulated observation time in pasture) and 91 for the Trévarez farm (336 h of cumulated observation time in pasture). The results show a high correlation of grazing time between the visual observations of activity and the information from the sensor (R2=0.93 on the Derval farm and 0.82 on the Trévarez farm) with a mean prediction error of 18 min (9%) for the Derval farm and 29 min (20%) for the Trévarez farm. Some slight biases related to the recording of walking in the pathways were noticed. Lifecorder+ appears to be a possible cheap, easy and precise tool to record grazing time at pasture. |
| Databáze: | OpenAIRE |
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