sensor

Bijeenkomst: EGF2015
Auteur: Ipema A.H., Holshof G. and De Mol R.M.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
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.

Bijeenkomst: EGF2015
Auteur: Zom R.L.G., Holshof G., Ipema A.H. and De Mol R.M.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
An experiment was conducted with the objective of evaluating whether the combined data from grazing and rumen pH sensors could be used to support grazing management. Data were collected during the 2014 grazing season from a 60-cow herd. The average milk yield was 26.1 kg milk cow‑1 day‑1. The cows were housed during the night (16:00-06:00 h) and received 8.4 kg dry matter (DM) of conserved forage cow‑1 day‑1. During the daytime (06:00-16:00 h) the cows were strip-grazed. Daily, the cows were given an edible herbage allowance of approximately 8 kg DM above 5 cm stubble height cow‑1. Automatic milking system visits and milk yields were collected per cow. Concentrates were fed during milking with a transponder-controlled concentrate dispenser. Each cow was equipped with a grazing sensor to measure grazing time. Eight cows were equipped with boluses to measure rumen pH. Milk yield was recorded for each milking and milk composition was recorded weekly. Pre- and post-grazing sward height and herbage composition were recorded daily. Relationships between grass and sensor data and cow performance were derived on the basis of retrospective analysis of milk performance, grazing behaviour and rumen pH data. Rumen pH sensors appear to be of little value. There was no clear relationship between grazing activity and pasture characteristics.