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Effects of ad libitum and rationed feeding of sows during several consecutive parities on the productivity 1st communication Live weight development, dynamic of backfat thickness and frequency of selected sows



Effects of ad libitum and rationed feeding of sows during several consecutive parities on the productivity 1st communication Live weight development, dynamic of backfat thickness and frequency of selected sows



Zuechtungskunde 75(1): 31-41



189 sows which were fed during six consecutive parities ad libitum (X=4.0 kg per day of energy reduced feed with 9.0 MJ ME/kg) and 173 sows which were fed in the same time interval rationed (X=3.0 kg per day of conventional feed with 10.8 MJ ME/kg) were investigated in a house for pregnant sows (altogether 1011 litters). The ad libitum fed sows showed a weight gain of 40 kg compared to 35 kg of the rationed fed sows. During the pregnancy the ad libitum fed sows showed a higher weight gain from parity to parity. The difference to the rationed fed sows was increased continuously up to the sixth parity. The coefficient of variation of the daily gain of the ad libitum fed sows was 45.2%. This figure describes the difference of daily gain within each measured group. The coefficient of variation of the daily gain with the rationed fed sows was 39.0%. In the group of ad libitum fed sows, both very high and negative weight developments were observed. During the observation period, the sows fed ad libitum had a higher increase of backfat thickness (MP1 from 4.8 to 9.5 mm) than the sows fed rationed (MP2 from 4.4 to 5.7 mm). The dynamic of backfat thickness of sows fed ad libitum grew from parity to parity, the dynamic of backfat thickness of the rationed fed sows was clearly more balanced during the five observed parities. From the ad libitum fed sows there had to be 6.1% of sows selected because of arthritis or leg injuries from the lager groups (32 sows) and 3.8% from the smaller groups (16 sows). The number of selected sows which were fed rationed was less than at the ad libitum groups. There must be selected only 1.6% from the smaller groups with 16 sows and 3.8% from the lager groups with 32 sows.

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