Effect of breed and diet quality during pregnancy period on performances of LW, L and LS-345 Peris gilts
1996
Balan, L. (S.C. ROMSUINTEST S.A., Peris (Romania))
The study was carried out on a total number of 250 gilts LW, L and LS 345 Peris and investigated the effects of breeds and dietary protein and energy levels during pregnancy on their performances. The following crude protein levels (CP) and metabolized energy (ME) were studied: 1 - 14.5 per cent CP and 2800 Kcal 0-114 days of gestation; 2 - 13.0 per cent CP and 2950 Kcal 0-114 days of gestation; 3 - 16.5 per cent CP and 3050 Kcal 0-10 and 90-114 days of gestation and 123.0 per cent CP and 2950 Kcal 10-90 days of gestation. The results have shown that: - the reproductive condition of gilts at mating was characterized at LW and L by an age of 221-222 days, body weights of 106-107 Kg, a backfat thickness of 22-23 mm and for LS 345 Peris by an age of 216 days, a body weight of 108 Kg and backfat thickness of 20 mm. - an increased content of dietary protein (14.5-16.5 instead of 13 per cent) had a little influence on total realized body gain (65-75 instead of 64-76 Kg) - the backfat thickness increasing was differentiated according with the dietary energy level and the highest values (6.6-7.0 mm) were recorded at experimental groups. - the gilts performances were not affected by the constant level of CP (13 per cent) over the whole pregnancy, the increased level of diet protein in the early and late pregnancy (0-10 and 90-114 days) remaining unjustified.
显示更多 [+] 显示较少 [-]