The effect of dietary lysine restriction during the grower phase and subsequent dietary lysine concentration during the realimentation phase on the performance, carcass characteristics and nitrogen balance of growing-finishing pigs
O' Connell, M.K.; Lynch P.B.; O' Doherty, J.V.
Livestock Science 101(1/3): 169-179
ISSN/ISBN: 1871-1413 DOI: 10.1016/j.livprodsci.2005.11.024
Two experiments (exp.) were conducted to determine the effect of dietary lysine restriction during the grower phase and subsequent dietary lysine concentration during realimentation on the performance, carcass characteristics and nitrogen (N) balance of growing-finishing pigs. Seventy-two pairs of crossbred (meatline sires x (Large White x Landrace) dams) pigs (36 pairs entire male, 36 pairs female) were used in a 2x4 factorial performance study (exp. 1, 35 to 96 kg). The two factors were Diet1 (two lysine levels: LO or HI, day (d) 0 to 35) and Diet2 (four lysine levels: LO, M1, M2 and HI, d36 to slaughter). A further 30 boars were used in a 2x3 factorial N-balance study (exp. 2, 31 to 42 kg; Diet1: LO or HI; Diet2: LO, M3 and HI).