The effect of nutritional supplements in late pregnancy on ewe colostrum production, plasma progesterone and IGF-1 concentrations [sheep]
1992
Hall, D.G. | Holst, P.J. (New South Wales Agriculture and Fisheries, Cowra (Australia). Agricultural Research Station) | Shutt, D.A. (New South Wales Agriculture and Fisheries, Camden (Australia). Elizabeth Macarthur Agricultural Inst.)
A new method for determining insulin-like growth factor (IGF-1) is presented. Colostrum production at parturition and IGF-1 concentration on day 140 of gestation and at parturition were higher, and progesterone concentrations on days 140, 145 and at parturition were lower for single than for twin bearing ewes. Progesterone concentrations at day 140 and at parturition were negatively related to estimated pasture intake during pregnancy, which was 17 percent higher for single than for twin bearing ewes. Supplementation with lupins and sunflower seed meal may be expected in similar circumstances to enhance the survival of multiple born lambs, while oat grain would not.
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