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Title:   Author  item
                                            NOTTER, DAVID - Virginia Polytechnic Institution & State Universityitem
                                            Lewis, Gregoryitem
                                            Mousel, Michelleitem
                                            Leeds, Timothy

                                                         - *Tim*item
                                            ZERBY, HENRY - The Ohio State Universityitem
                                            MOELLER, STEVEN - The Ohio State Universityitem
                                            Kirschten, Daviditem
                                            Taylor, Joshua

                                                         - *Bret*
  Submitted to: Popular Publication
                                    Publication Type: Popular Publication
                                    Publication Acceptance Date: 9/11/2013
                                    Publication  Date: 11/1/2014
                                    Citation: Notter, D.R., Lewis, G.S., Mousel, M.R., Leeds, T.D., Zerby, H.N., Moeller, S.J., Kirschten, D.P., Taylor, J.B. 2014. Evaluation of Columbia, USMARC-Composite, Suffolk, and Texel rams at terminal sires in an extensive rangeland production system. Suffolk Newsletter. 2(8):9-11.Interpretive Summary: Crossing proven, superior terminal-sire sheep breeds with well-adapted maternal breeds provide opportunity to increase lamb carcass value, while maintaining acceptable environmental adaptation in crossbred lambs.  Large, lean terminal-sire breeds, such as the Suffolk and Columbia, have been typically used in extensive rangeland conditions.  Relatively intense selection in these breeds for body weight and frame size has resulted in increases in growth rate but also concerns regarding fitness and survival rates of offspring.  Recently, other moderate size terminal-sire breeds have been promoted as alternatives to Suffolk and Columbia breeds. Unfortunately, performance data of these alternative sire types as well as fitness data from traditional and alternative terminal-sire breeds are somewhat limited, especially from extensive rangeland production systems. Therefore, an experiment was conducted at the U.S. Sheep Experiment Station (USSES) to compare Columbia, USMARC Composite, Suffolk, and Texel sires in matings with Rambouillet ewes in an extensive rangeland production system.  For nearly all traits measured, Suffolk rams were superior to USMARC Composite, Texel, and Columbia rams as sires of crossbred market lambs.  Texel-sired lambs were superior to other breeds in loin muscle area at comparable harvest weights, produced acceptable carcasses when harvested at 110 lbs, and generally had favorable residual feed intake values.  Overall, these results suggest opportunity to develop new composite lines that can combine favorable effects of the Suffolk and Texel breeds. Further, more intense selection for growth rates, loin muscle size, and perhaps efficiency of feed conversion are required in order for the Columbia to compete directly with the Suffolk as a terminal sire.
                                Technical Abstract: Crossing proven, superior terminal-sire sheep breeds with well-adapted maternal breeds provide opportunity to increase lamb carcass value, while maintaining acceptable environmental adaptation in crossbred lambs.  Large, lean terminal-sire breeds, such as the Suffolk and Columbia, have been typically used in extensive rangeland conditions.  Relatively intense selection in these breeds for body weight and frame size has resulted in increases in growth rate but also concerns regarding fitness and survival rates of offspring.  Recently, other moderate size terminal-sire breeds have been promoted as alternatives to Suffolk and Columbia breeds. Unfortunately, performance data of these alternative sire types as well as fitness data from traditional and alternative terminal-sire breeds are somewhat limited, especially from extensive rangeland production systems. Therefore, an experiment was conducted at the U.S. Sheep Experiment Station (USSES) to compare Columbia, USMARC Composite, Suffolk, and Texel sires in matings with Rambouillet ewes in an extensive rangeland production system.  For nearly all traits measured, Suffolk rams were superior to USMARC Composite, Texel, and Columbia rams as sires of crossbred market lambs.  Texel-sired lambs were superior to other breeds in loin muscle area at comparable harvest weights, produced acceptable carcasses when harvested at 110 lbs, and generally had favorable residual feed intake values.  Overall, these results suggest opportunity to develop new composite lines that can combine favorable effects of the Suffolk and Texel breeds. Further, more intense selection for growth rates, loin muscle size, and perhaps efficiency of feed conversion are required in order for the Columbia to compete directly with the Suffolk as a terminal sire.


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