Lying behavior was examined on 5 groups of 2 sows fed in a pen. There was a concrete paddock (17 m
2) attached to the pen (8 m
2). Changes in lying behavior of sows fed in group (sows in group feeding) involved in different seasons were investigated at spring (temperature of pig house 8-19°C), summer (21-35°C), autumn (8-24°C) and winter (0-9°C). Frequency of lying behavior for a day was 11.1±4.3 times for summer, 10.6±2, 7 times for autumn, 9.4±3.2 times for spring and 6.3±2.7 times for winter (p<0.05). The longest duration of lying behavior for a day was 1.268±37 minutes in summer and followed by 1, 267±26 minutes for autumn, 1, 259±55 minutes for spring and 1, 206±52 minutes for winter, respectivly, which showed significant differences statistically (p<0.01). With respect to group lying behavior, the average percentage was 93.2±4.2% for winter, 85.6±7.7% for spring, 71.4±11.4% for autumn and 30.8±24.6% for summer (p<0.01). As seen from the above, frequency and duration for a day in lying behavior of sows fed in group (sows in group feeding) were decreased with fall in temperature of the pig house. Contrary to those results, the average percentage of group lying behavior was increased with low temperature of the pig house.
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