Title | Effects of repeated cycles of feed intake shifts on growth, feed efficiency and endocrine profiles of wether lambs |
Publication Type | Journal Article |
Year of Publication | 1993 |
Authors | Estell RE, Havstad K, Heird C.E., Fredrickson E.L., Hallford D.M., Shupe, W. Larry |
Journal | Small Ruminant Research |
Volume | 10 |
Pagination | 103-118 |
Date Published | March 1, 1993 |
Keywords | Carcass weight, Endocrine profile, feed intake, growth, Lamb |
Abstract | Fifteen wether lambs (average BW 28.8 ± 1.8 kg) were used in a 128-d trial to examine effects of cyclical feeding changes on growth, feed efficiency and endocrine profiles. Control lambs were fed a 40% concentrate diet (40C) at 1.5 × NEm requirement during period 1 (64 d). Another group (1x/2x) was fed 40C at 1 and 2 x NEm in 4-d intervals during period 1; a third group (70/10) 70% and 10% concentrate diets in 4-d intervals during period 1. To achieve dry matter intake comparable to controls, 70/10 lambs were fed at 1.79 (70C) and 1.21 (10C) × NEm. All lambs were placed on the control diet during period 2 (32 d) and increased to 2 x maintenance during period 3 (32 d). During period 2, ADG and gain/feed of control lambs tended to be greater (P<0.10) than for lambs fed alternating treatments. Liver weight as a percentage of hot carcass weight was greater (P<0.05) for controls than for lambs fed alternating treatments. Hot carcass weight (P=0.07) and dressing percentage (P=0.09) tended to be greater for the 70/10 treatment than for controls. The 1x/2x treatment lowered (P<0.05) serum cholesterol compared with other groups on d 65, but not on d 0 or 129. Smaller liver weight per unit of hot carcass weight for lambs in the 1x/2x and 70/10 treatments suggests a possible reduction of maintenance requirements. |
URL | /files/bibliography/398.pdf |
DOI | 10.1016/0921-4488(93)90054-L |