Behaviour of dairy cows when fed concentrates with an automatic feeding system

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On Dutch commercial farms automatic systems for feeding concentrates in a feeding station are being used increasingly. Various systems have been developed, which differ in the timing and amount of concentrates made available to the cows over a 24-h period. Three types of a fixed-time system and one variable-time system are compared with a traditional system. The fixed-time systems provided a ration of concentrates every 12 h. The starting time of these 12-h cycles varied, hence the fixed-7-time system started at 07:00 and 19:00 h; the fixed-11-time system cycles started at 11:00 and 23:00 h; and the fixed-3-time system cycles started at 15:00 and 03:00 h. The variable-time system continuously added small amounts of concentrates to the available ration per cow throughout a 24-h cycle. The traditional system provided concentrates mixed with maize silage at the feeding rack. The aim of the investigation was to describe the pattern of intake of concentrates, and the possible consequences of the various feeding systems on the cows' general activities such as eating, standing and lying down. Three experiments were carried out, each with a group of 20 lactating dairy cows kept in a cubicle house with a single concentrates feeding station. In each of the experiments, feeding systems were tested during 3-week experimental periods. Behaviour was observed during three 24-h periods in each experimental period. It was found that each of the five feeding systems tested evoked a typical pattern of visits to the feeding station. The number, the duration and the timing of rewarded and unrewarded visits differed between the various systems. The cows adapted to each feeding system, eating all their rations of concentrates as soon as they were made available. Adaptation to the feeding system affected several of the general activities, in particular the time spent at the feeding rack and the time spent lying in the cubicles. With the fixed-11-time system, new feeding cycles started at times when many cows were lying down. Under these conditions the lowranking cows sometimes had to wait a long time before they could enter the station, which resulted in a reduced lying time for them.