References

1. CAST. Animal Agriculture and Global Food Supply; Report No. 135, Council Agric. Sci. Tech.: Ames, IA, 1999; 1 92.

2. Shelton, M. Breeding for improvement of meat production in sheep: Preface and overview. Sheep Goat Res. J. 2002, 17 (3), 1 5.

3. Wang, C.T.; Dickerson, G.E. Simulation of life cycle efficiency of lamb and wool production for genetic levels of component traits. J. Anim. Sci. 1991, 69 (11), 4324 4337.

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6. Bradford, G.E. Selection for Litter Size. In Genetics of Reproduction in Sheep, 1st Ed.; Land, R.B., Robinson, D.W., Eds.; Butterworths: London, 1985; 3 18.

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9. Lewis, R.M.; Simm, G. Selection strategies in sire referencing schemes in sheep. Livest. Prod. Sci. 2000, 67 (1 2), 129 141.

10. Simm, G.; Lewis, R.M.; Collins, J.E.; Nieuwhof, G.J. Use of sire referencing schemes to select for improved carcass composition in sheep. J. Anim. Sci. 2001, 79 (E. Suppl.), E255 E259.

Cleon V. Kimberling Geri Parsons

Colorado State University, Fort Collins, Colorado, U.S.A.

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