For dairy cows, a large variation is observed in daily time spent lying down. Individual variations and differences connected with housing or management are known to affect the actual time spent lying. A series of experiments with dairy cows kept in cubicle houses was carried out. We investi-gated the consequences of some details of the cubicle house and of overcrowding on the time spent standing and lying in the cubicles. The aim of the experiments was to obtain information about the significance of cubicles for resting and for hiding. Four experiments were carried out with a total of seven different groups of dairy cows. In the first experiment, the cows were kept in a so-called old cubicle house, which differed in various ways from a so-called new cubicle house in which the other three experiments were performed. In each experiment, a normal situation — with as many feeding and lying places as animals in the group — was compared with an overcrowded situation in which both the number of feeding and lying places was reduced. In the four experiments, overcrowding levels of 50, 55, 25 and 33.3% were tested. To measure the time spent eating, standing and lying, detailed observations were carried out for 24-h periods. Under normal conditions, the cows spent ∼13 h lying and 2.5 h standing per 24 h. In the old cubicle house, under normal conditions, the time spent in the cubicles was lower than in the new cubicle house. This is probably due to two factors: (1) the cubicles were smaller and less comfortable; (2) in the old cubicle house the cows could hide from confrontations with group mates at the feeding rack with its separations between the feeding places as well as in the cubicles. Overcrowding resulted in a reduction in time spent lying in the cubicles and also in a reduced time spent standing in the cubicles in the new cubicle house. It is concluded that under over-crowded conditions, lying is more important than standing in the cubicles. Based on these experiments and on the available literature, it is concluded that lying is important for the cows. This means that cubicles are important for the cows; however the minimum time that the cows need to lie or stand in a cubicle is not yet known. Various factors are suggested which may affect how long the cows need to lie.
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