Evaluation of Columbia, USMARC- Composite, Suffolk, and Texel Rams as Terminal Sires in an Extensive Rangeland Production System
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1 Evaluation of Columbia, USMARC- Composite, Suffolk, and Texel Rams as Terminal Sires in an Extensive Rangeland Production System Gregory S. Lewis USDA, ARS, U.S. Sheep Experiment Station Dubois, ID David R. Notter Virginia Tech, Blacksburg
2 Numbers of lambs weaned per ewe mated for Rambouillet ewes mated to Columbia, Composite, Suffolk, and Texel rams. Differences among the sire breeds are not statistically significant Lambs weaned per ewe lambing Lambs weaned per ewe mated
3 Survival functions from birth to weaning for lambs sired by Columbia, Composite, Suffolk, and Texel rams, and adjusted to a lamb born in 2007 to a 3-yr-old ewe. Sire breeds that do not share a common letter differed (P < 0.05) for survival rate.
4 Body weights at birth, weaning, and 90 days postweaning for lambs sired by Columbia, Composite, Suffolk, and Texel rams. Values within shaded columns are birth weights and gains during the pre- and postweaning periods Body weight, lb Sire breed Birth wt Pre-weaning gain Postweaning gain
5 Ultrasound backfat thickness for ewe and wether lambs sired by Columbia, Composite, Suffolk, and Texel rams at 90 days postweaning, or 110 or 132 pounds live weight. Horizontal lines designate boundaries between Yield Grades 2 and 3 or 3 and Ultrasound backfat thickness, in YG 3/4 YG 2/3 YG 1/ d postweaning 110 pounds 132 pounds
6 Carcass backfat and body wall thicknesses for wether lambs sired by Columbia, Composite, Suffolk, and Texel rams at age- or weight-constant endpoints. Horizontal line is the boundary for carcass backfat between Yield Grades 2 and Carcass backfat or body wall thickness, in YG 2/ Age-constant backfat Wt-constant backfat Age-constant body wall Wt-constant body wall
7 Ultrasound loin muscle area for ewe and wether lambs sired by Columbia, Composite, Suffolk, and Texel rams at 90 days postweaning, 132 pounds live weight, or 0.25 inches of backfat 2.70 Ultrasound loin muscle area, in d postweaning 132 pounds 0.25 inches backfat Endpoint
8 Carcass loin muscle area for wether lambs sired by Columbia, Composite, Suffolk, and Texel rams at age- or weight-constant endpoints Carcass loin muscle area, in Age-Constant Endpoint Wt-constant
9 Relative values for gain:feed ratio (overall average = 100; higher values indicate more efficient growth) for lambs sired by Columbia, Composite, Suffolk, and Texel rams at 90 days postweaning, 132 pounds live weight, or 0.25 inches of 120 backfat Relative value of gain:feed ratio, % d postweaning 132 pounds 0.25 inches backfat
10 Residual feed intake for lambs sired by Columbia, Composite, Suffolk, and Texel rams at 90 days postweaning, 132 pounds live weight, or 0.25 inches of backfat. Low values are superior, and indicate that less feed was required given observed body weights and average daily gains Residual feed intake, pounds Columbia-sired lambs required over 15 lb more feed than expected based on observed body wt and growth rates 90 days 132 pounds 0.25 inches backfat
11 Residual gain for lambs sired by Columbia, Composite, Suffolk, and Texel rams at 90 days postweaning, 132 pounds live weight, or 0.25 inches of backfat. Higher values are superior, and indicate more rapid gains at similar body weights and levels of feed intake Residual gain, lb Suffolk-sired lambs gained 2+ lb more than expected based on their observed body wt and feed intake days 132 pounds 0.25 inches backfat
12 Alternative measures of feed efficiency intake for lambs sired by Columbia, Composite, Suffolk, and Texel rams at 90 days on test. Values have been adjusted to equalize the scales, and values of RFI are inverted. Therefore, positive values are always superior. Feed efficiency measurement Relative efficiency of Texel vs. Suffolk is different for RFI than for other estimates of efficiency -20 Gain:feed (scaled) RFI (inverted) RNG (scaled) Net returns, $
13 Cumulative residual feed intake across days on study by lamb sire breed
14 Selling on a Lamb Pricing Grid Carcass wt, lb Yield Grade / Backfat Thickness (in) 1 (< 0.16) 2 ( ) 3 ( ) 4 ( ) 5 (>0.46) <55 - $5 / cwt - $15 / cwt -$35 / cwt Base + $12/cwt Base -$10 / cwt -$30 / cwt 85 - $20/cwt - $30 /cwt - $50 /cwt
15 Selling on a Lamb Pricing Grid USSES Terminal Sired Lambs: 4 sire breeds (CO, C3, SU, TX) mated to Rambouillet ewes. Harvest lambs at wts between 120 and 150 lb. Where do they fit the Grid? Carcass wt, lb 1 (< 0.16) Yield Grade / Backfat Thickness (in) 2 ( ) 3 ( ) 4 ( ) 5 (>0.46) <55 - $5 / cwt (1%) - $15 / cwt -$35 / cwt $12/cwt Base (70%) -$10 / cwt (23%) (4%) Base (2%) -$30 / cwt 85 - $20/cwt - $30 /cwt - $50 /cwt
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