Auteur: Ipema A.H., Holshof G. and De Mol R.M.
Jaar van uitgifte: 2015
In the Autograssmilk project funded by the EU-FP7 programme an experiment was conducted with the objective to study the potential of using new technologies for the optimisation and integration of automatic milking with cow grazing. Data were collected during the 2014 grazing season from a 60-cow herd. The herd was kept in the barn during the night (16:00-6:00) where 8.4 kg dry matter (DM) per cow per day of conserved forage was fed. During the day (6:00-16:00) the herd had access to a strip of grass with approximately 8 kg DM per cow per day. Cows were free to return to the barn for visiting the milking robot. Automatic milking-system visits and milk yields were collected per cow. The average milk yield was 26.1 kg milk per cow per day. Feeding time was measured with a sensor attached to the neck of each cow. The cows spent an average of 346 minutes per day for feeding/grazing. For forage fed in the barn, cows spent an average of 6.7 minutes feeding time per kg of milk, while for grazing 8.8 minutes per kg of milk was spent. Older cows were significantly more efficient than heifers in their feeding time in the barn, whereas for grazing the differences were smaller.