Effect of feeding level of sows during pregnancy on their food intake and live weight during the two reproduction cycles
Zhivotnov"dni Nauki 38(1): 155-159
In an experiment with 30 sows the influence of feeding level of sows during pregnancy on their food intake and live weight during the two reproduction cycles was studied. Following feeding levels were tested: I group - 2.2 kg per day from conception to 80-th day of pregnancy and 2.7 kg after that and II group - 1.9 kg per day during entire pregnancy. Decreasing of feeding level of II group sows during pregnancy led to increase in food intake with 7.1% in the first lactation and with 9.4% in the second lactation compared to the first group (183.0 kg and 196.0 kg for I and II group in I lactation; 200.0 kg and 218.8 kg respectively for II). Pregnancy feeding level has affected significantly the weight of sows at 110-th day of pregnancy - 167.3 kg and 159.7 kg for I and II group in first reproductive cycle (P<0.01), and 198.0 kg and 187.7 kg for the two groups (P<0.05) in the second reproductive cycle respectively. The same way was changed the saws live weight after farrowing (149.3 kg and 143.3 kg; 174.5 kg and 170.5 kg for I and II group in both cycles respectively). During lactation period sows with lower feeding level in pregnancy increased their weight in both reproductive cycles (with 5.0 kg and 2.8 kg respectively), while animals receiving higher feeding level during pregnancy decreased their weight during the nursing period (with 3.8 kg and with 3.5 kg respectively for the two reproduction cycles). Because of that the live weights of sows of both groups were close in their values (146.3 kg and 145.7 kg; 171.0 kg and 172.7 kg for first and second group for the two reproductive cycles respectively). Irrespective of the pregnancy feeding level sows of both groups have increased their live weight with 30 kg during the period from the first to the second conception.