A model to find and test decision rules for turnout date and grazing area allocation for a dairy cow system in spring |
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| Affiliation: | 1. INRA, UR 0045 Laboratoire de Recherches sur le Développement de l''Elevage, Quartier Grossetti, 20250 Corte, France;2. Hellenic Agricultural Organization, Veterinary Research Institute, P.O. Box 60 272, 57 001, Thessaloniki Greece;3. Department of Nutrition Physiology and Feeding, Faculty of Animal Sciences and Aquaculture, Agricultural University of Athens, 75 Iera Odos, 11855, Athens, Greece;4. UMR Systèmes d’élevage Méditerranéens et Tropicaux (SELMET), INRA – CIRAD – MontpellierSupAgro – Univ Montpellier, 2 place Pierre Viala, 34060 Montpellier cedex 1, France;1. Biotechnical Faculty, Department for Animal Science, University of Ljubljana, Groblje 3, 1230 Domžale, Slovenia;2. Department of Knowledge Technologies, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;1. Young Researchers and Elites Club, North Tehran Branch, Islamic Azad University, Tehran, Iran;2. School of Chemical Engineering, Yeungnam University, Gyeungsan, Republic of Korea;3. School of Environment, Science & Engineering, Southern Cross University, Lismore, NSW, Australia;1. AGIR, Université de Toulouse, INPT, INP-PURPAN, INRA, 31320 Castanet-Tolosan, France;2. INRA, Toulouse School of Economics, UMR 1081 LERNA, F-31000 Toulouse, France;3. Indian Institute of Sciences, Department of Civil Engineering, Bangalore 560012, India;4. ATREE, Bangalore 560 064, India;5. INRA, UMR 1069 SAS, F-35042 Rennes, France;6. INRA, UR 0875 MIAT, F-31326 Castanet-Tolosan, France;7. Indo-French Cell of Water Sciences, IRD-IISc, Bangalore, India |
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| Abstract: | Use of grazing is decreasing in dairy cow systems in many European countries. However, pasture has a lower production cost than most conserved forage. Furthermore, agronomic decision rules are available to provide dairy cows with sufficient quality and quantity of dry matter. The decline in use of grazing is partly due to organisational difficulties in planning the grazing period. Land use at the farm level requires that this plan must be made in September, about 6 months before the turnout date. This area planning depends on the decision rule used for the turnout date. So we propose to search for a combination of area planning and turnout decision rules that allows a dairy herd to be fed in the spring by means of grazing without any risk of an interruption in the feeding. For this we propose to use a simulation model combining a grass growth model and a model for scheduling the farmer's decisions. A test of a turnout date rule showed that it is necessary to use an area allocation decision rule that depends on the turnout date rule and not the converse. We therefore proposed another turnout date rule based on the available herbage per ha and we calculated the area to allocate on the basis of this turnout rule. |
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