Centre for Genetic Improvement of Livestock
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Faculty Members

Professor

Position

Professor Emeritus, Centre for Genetic Improvement of Livestock (CGIL), Animal & Poultry Science, University of Guelph
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Publications

• Quinton, V.M., J.W. Wilton, J.A. Robinson and P.K. Mathur. 2006. Economic weights for sow productivity traits in nucleus pig populations. Livest. Sci. 99:69-77.
• Schenkel, F.S., S.P. Miller, Z. Jiang, I.B. Mandell, X. Ye, H. Li and J.W. Wilton. 2006. Association of a single nucleotide polymorphism in the calpastatin gene with carcass and meat quality traits of beef cattle. J. Anim. Sci. 84:291-299.
• Van Groningen, C., C.J.B. Devitt, J.W. Wilton and J.A.L. Cranfield. 2006. Economic evaluations of beef bulls in an integrated supply chain. J. Anim. Sci. 84:3219-3227.
• Mandell, I.B., C.P. Campbell, V.M. Quinton and J.W. Wilton. 2006. Effects of skeletal separation method and postmortem ageing on carcass traits and shear force in cull cow beef. Can. J. Anim. Sci. 86:351-361.
• Bergen, R., S.P. Miller, J.W. Wilton and I.B. Mandell. 2006. Genetic correlations between live yearling bull and steer carcass traits adjusted to different slaughter end points. 2. Carcass fat partitioning. J. Anim. Sci. 84:558-566.
• Bergen, R., S.P. Miller, J.W. Wilton, D.H. Crews Jr. and I.B. Mandell. 2006. Genetic correlations between live yearling bull and steer carcass traits adjusted to different slaughter end points. 1. Carcass lean percentage. J. Anim. Sci. 84:546-557.
• Bergen, R., S.P. Miller and J.W. Wilton. 2005. Genetic correlations among indicator traits for carcass composition measured in yearling beef bulls and finished feedlot steers. Can. J. Anim. Sci. 85:463-473.
• Schenkel, F.S., S.P. Miller, X. Ye, S.S. Moore, J.D. Nkrumah, C. Li, J. Yu, I.B. Mandell, J.W. Wilton and J.L. Williams. 2005. Association of single nucleotide polymorphisms in the leptin gene with carcass and meat quality traits of beef cattle. J. Anim. Sci. 83:2009-2020.
• Roso, V.M., F.S. Schenkel, S.P. Miller and J.W. Wilton. 2005. Additive, dominance, and epistatic loss effects on preweaning weight gain of crossbred beef cattle from different Bos taurus breeds. J. Anim. Sci. 83:1780-1787.
• Wang, Y., F.S. Schenkel, S.P. Miller and J.W. Wilton. 2005. Comparison of models and impact of missing records on genetic evaluation of calving ease in a simulated beef cattle population. Can. J. Anim. Sci. 85:145-155.
• Sullivan, P.G., J.W. Wilton, L.R. Schaeffer, G.J. Jansen, J.A.B. Robinson and O.B. Allen. 2005. Genetic evaluation strategies for multiple traits and countries. Livest. Prod. Sci. 92:195-205.
• Tosh, J.J. and J.W. Wilton. 2004. Impact of the relative emphasis on growth and litter size in a maternal index for selecting sheep. Can. J. Anim. Sci. 84:713-715.
• Schenkel, F.S., S.P. Miller and J.W. Wilton.  2004.  Genetic parameters and breed differences for feed efficiency, growth, and body composition traits of young beef bulls.  Can. J. Anim. Sci. 84:177-185.
• Schenkel, F.S., C.J.B. Devitt, J.W. Wilton, S.P. Miller and J. Jamrozik.  2004.  Random regression analyses of feed intake of individually tested beef steers.  Livest. Prod. Sci. 88:129-142.
• Schenkel, F.S., S.P. Miller and J.W. Wilton. 2004.  Herd of origin effect on weight gain of station-tested beef bulls.   Livest. Prod. Sci. 86:93-103.
• Fernandes, T.L., J.W. Wilton and J.J. Tosh. 2004. Estimates of genetic parameters for ultrasound-measured carcass traits in sheep. Can. J. Anim. Sci. 84:361-365.
• Broring, N., J.W. Wilton and P.E. Colucci.  2003.  Body condition score and its relationship to ultrasound backfat measurements in beef cows.  Can J. Anim. Sci. 83:593-596.
• Kulak, K., J. Wilton, G. Fox and J. Dekkers.  2003.  Comparisons of economic values with and without risk for livestock trait improvement.  Livest. Prod. Sci. 79:183-191.
• Tosh, J.J. and J.W. Wilton.  2002.  A terminal-sire index for selecting rams.  Can. J. Anim. Sci. 82:591-593.
• Mwansa, P.B., D.H. Crews, Jr., J.W. Wilton and R.A. Kemp.  2002.  Multiple trait selection for maternal productivity in beef cattle.  J. Anim. Breed. Genet. 119:391-399.
• Devitt, C.J.B., J.W. Wilton, I.B. Mandell, T.L. Fernandes and S.P. Miller.  2002.  Genetic evaluation of tenderness of the longissimus in multi-breed populations of beef cattle and the implications of selection.  7th World Congr. Genet. Appl. Livest. Prod.  Montpellier, France.  CD-ROM Communication No. 11-34.
• Fernandes, T.L., J.W. Wilton, I.B. Mandell and C.J.B. Devitt.  2002.  Genetic parameter estimates for meat quality traits in beef cattle managed under a constant finishing program.  7th World Congr. Genet. Appl. Livest. Prod.  Montpellier, France.  CD-ROM Communication No. 02-93.
• Schenkel, F.S., C.J.B. Devitt, J.W. Wilton, S.P. Miller and J. Jamrozik.  2002.  Random regression analyses of feed intake of individually tested beef steers.  7th World Congr. Genet. Appl. Livest. Prod.  Montpellier, France.  CD-ROM Communication No. 10-25.
• Tosh, J.J., J.W. Wilton and D. Kennedy.  2002.  Heritability of fertility in four seasons for ewes under accelerated lambing.  7th World Congr. Genet. Appl. Livest. Prod.  Montpellier, France.  CD-ROM Communication No. 08-20.
• Wang, Y., S.P. Miller, F.S. Schenkel, J.W. Wilton and P.J. Boettcher.  2002.  Performance of a linear-threshold model to evaluate calving ease and birth weight in a multibreed beef population.  7th World Congr. Genet. Appl. Livest. Prod.  Montpellier, France.  CD-ROM Communication No. 17-10.
• Wilton, J.W., C.J.B. Devitt and S.P. Miller.  2002.  Sensitivity of rankings of beef sires for non-linear multiple trait breeding objectives.   7th World Congr. Genet. Appl. Livest. Prod.  Montpellier, France.  CD-ROM Communication No. 02-27.
• Schenkel, F.S., S.P. Miller, J. Jamrozik and J.W. Wilton.  2002.  Two-step and random regression analyses of weight gain of station-tested beef bulls.  J. Anim. Sci. 80:1497-1507.
• Laborde, F.L., I.B. Mandell, J.J. Tosh, J.G. Buchanan-Smith and J.W. Wilton.  2002.  Effect of management strategy on growth performance, carcass characteristics, fatty acid composition, and palatability attributes in crossbred steers.  Can. J. Anim. Sci. 82:49-57.
• Devitt, C.J.B. and J.W. Wilton.  2001.  Genetic correlation estimates between ultrasound measurements on yearling bulls and carcass measurements on finished steers.  J. Anim. Sci. 79:2790-2797.
• Wade, C.M., J.W. Wilton and S.P. Miller.  2001.  Determination of breeding strategies for beef cattle bull breeders selling bulls into two competing markets on a non-linear price grid.  Can. J. Anim. Sci. 81:169-177.
• Laborde, F.L., I.B. Mandell, J.J. Tosh, J.W. Wilton and J.G. Buchanan-Smith.  2001.  Breed effects on growth performance, carcass characteristics, fatty acid composition and palatability attributes in finishing steers.  J. Anim. Sci. 79:355-365.
• Allen, O.B., I.B. Mandell, J.W. Wilton and J.G. Buchanan-Smith. 2000.  Technical note:  Covariance adjustment in beef cattle research.  J. Anim. Sci. 78:2282-2286.
• Sullivan, P.G., J.W. Wilton, S.P. Miller and L.R. Banks. 1999. Genetic trends and breed overlap derived from multiple-breed genetic evaluations of beef cattle for growth traits. J. Anim. Sci. 77:2019-2027.
• Miller, S.P. and J.W. Wilton. 1999. Genetic relationships among direct and maternal components of milk yield and maternal weaning gain in a multibreed beef herd. J. Anim. Sci. 77:1155-1161.
• Miller, S.P., J.W. Wilton and W.C. Pfeiffer. 1999. Effects of milk yield on biological efficiency and profit of beef production from birth to slaughter. J. Anim. Sci. 77:344-352.
• Mandell, I.B., E.A. Gullett, J.W. Wilton, O.B. Allen and R.A. Kemp. 1999. Effects of breed and dietary energy content within breed on growth performance, carcass and chemical composition and beef quality in Hereford and Simmental steers. Can. J. Anim. Sci. 78:533-541.
• Gibson, J.P. and J.W. Wilton. 1998. Defining multiple-trait objectives for sustainable genetic improvement. J. Anim. Sci. 76:2303-2307.
• Wilton, J.W., S.P. Miller and M.T. Lazenby.  1998.  Developments in multiple trait selection practices considering multiple breeds and an optimal product.  Proc. 6th World Congr. Genet. Appl. Livest. Prod. 25:367-370.
• Lazenby, M.T., S.P. Miller and J.W. Wilton.  1998.  Effect of a change in price relationships on trait emphasis when selecting commercial beef bulls.  Proc. 6th World Congr. Genet. Appl. Livest. Prod. 25:371-374.
• Mandell, I.B., E.A. Gullett, J.W. Wilton, R.A. Kemp and O.B. Allen. 1997. Effects of gender and breed on carcass traits, chemical composition, and palatability attributes in Hereford and Simmental bulls and steers. Livest. Prod. Sci. 49:235-248.
• Mandell, I.B., E.A. Gullett, J.W. Wilton, O.B. Allen and V.R. Osborne. 1997. Effects of diet, breed and slaughter endpoint on growth performance, carcass composition and beef quality traits in Limousin and Charolais steers. Can. J. Anim. Sci. 77:23-32.
• Fan, L.Q. and J.W. Wilton. 1996. A comparison of carcass wholesale cut characteristics between sexes and among biological types of cattle. Singapore J. Pri. Ind. 24:81-90.
• Fan, L.Q., J.W. Wilton and P.E. Colucci. 1996. Genetic parameters for feed intake and efficiency in dry pregnant beef cows. Can. J. Anim. Sci. 76:73-79.
• Fan, L.Q., J.W. Wilton and P.E. Colucci. 1996. Genetic parameters for feed intake and efficiency in lactating beef cows. Can. J. Anim. Sci. 76:81-87.
• Wilton, J.W. and M.E. Goddard. 1996. Selection for carcass and feedlot traits considering alternative slaughter end points and optimized management. J. Anim. Sci. 74:37-45.
• Johnson, W.H., J.A. Thompson, J. Kumi-Diaka, J.W. Wilton and I.B. Mandell. 1995. The determination and correlation of reproductive parameters of performance-tested Hereford and Simmental bulls. Theriogenology 44:973-982.
• Tosh, J.J. and J.W. Wilton. 1994. Effects of data structure on variance of prediction error and accuracy of genetic evaluation. J. Anim. Sci. 72:2568-2577.
• Koots, K.R., J.P. Gibson, C. Smith and J.W. Wilton. 1994. Analyses of published genetic parameter estimates for beef production traits. 1. Heritability. Anim. Breed. Abstr. Vol. 62, No.5:309-338.
• Koots, K.R., J.P. Gibson and J.W. Wilton. 1994. Analyses of published genetic parameter estimates for beef production traits. 2. Phenotypic and genetic correlations. Anim. Breed. Abstr. Vol. 62, No.11:825-853.

For copies of above reprints, click here

Articles

2003 Ontario Beef Research Update

• Genetic improvement:  what is its value to Ontario's beef industry?  C.J.B. Devitt, J.W. Wilton and W. Pfeiffer.
• Study of various fat measurements from beef carcasses finished at a targeted backfat thickness.  T.L. Fernandes, J.W. Wilton, I.B. Mandell, T. Hamilton and G. Roy. 
• Genetic parameters and breed differences for feed efficiency, growth and carcass traits of beef bulls.  F.S. Schenkel, S.P. Miller and J.W. Wilton. 

2002 Ontario Beef Research Update

• Genetic evaluation of ribeye tenderness and the implications of selection.  C.J.B. Devitt, J.W. Wilton, I.B. Mandell, T.L. Fernandes and S.P. Miller. 
• Genetics of carcass traits in beef cattle targeted to finish at a constant fat thickness.  T.L. Fernandes, J.W. Wilton, I.B. Mandell, T. Hamilton and G. Roy.  
• Herd of origin effect on weight gain of station-tested beef bulls.  F.S. Schenkel, S.P. Miller and J.W. Wilton. 
• Genetics for a commodity or a consumer product?  J.W. Wilton, C.J.B. Devitt and S.P. Miller.  

2000/01 Ontario Beef Research Update

• Serial real-time ultrasound to predict carcass quality in commercial beef cattle.  T. Fernandes, S.P. Miller, C.J.B. Devitt and J.W. Wilton. 
• Random regression analysis of weight gain of station-tested beef bulls.  F.S. Schenkel, S.P. Miller, J. Jamrozik and J.W. Wilton.  
• Genetic parameters and optimum length of test for station-tested beef bulls.  F.S. Schenkel, S.P. Miller, J. Jamrozik and J.W. Wilton. 
• The relationship between birth weight and calving ease in a beef herd.  Y. Wang, S.P. Miller, J.W. Wilton, P. Sullivan and L.R. Banks. 

1999/2000 Ontario Beef Research Update

• Female replacement strategies in beef crossbreeding programs.  G.R. Brown and J.W. Wilton.  
• Crossbreeding strategies for phenotypic uniformity of production and carcass characteristics.  G.R. Brown and J.W. Wilton
• Genetic correlation estimates between ultrasound measurements on yearling bulls and carcass measurements on finished steers.  C.J.B. Devitt and J.W. Wilton
• Breed effects on growth performance, carcass characteristics, palatability attributes and fatty acid composition of finishing steers.  F.L. Laborde, I.B. Mandell, J.J. Tosh, J.W. Wilton and J.G. Buchanan-Smith.  
• Effects of backgrounding vs. grain feeding on growth performance, carcass characteristics, palatability attributes, and fatty acid composition of finishing steers. F.L. Laborde, I.B. Mandell, J.J. Tosh, J.G. Buchanan-Smith and J.W. Wilton. 
• Sire differences for carcass measurements in a maternal/terminal cross breeding system.  J.W. Wilton, T. Fernandes, I.B. Mandell, J. Buchanan-Smith, J. Handley, T. Hamilton and G. Roy.

1998/99 Ontario Beef Research Update

• Carcass measures of the maternal/terminal line breeding project.  A.M. Edwards, J.W. Wilton, I.B. Mandell, J. Buchanan-Smith, J. Handley, T. Hamilton and G. Roy
• Customized sire selection on the internet.  M.T. Lazenby, S.P. Miller, L.R. Banks and J.W. Wilton
• Breeding directions for Ontario beef cattle breeders: am I satisfying my clients?  C. Wade and J.W. Wilton

1997 Ontario Beef Research Update

• Ontario beef cattle marketing practices. A.M. Edwards and J.W. Wilton.
• Survey of the packing, processing, and retail segments of the Ontario beef industry. A.M. Edwards and J.W. Wilton.
• Tactical breeding strategies to exploit across and within breed dominance variation. B.J. Hayes, S.P. Miller and J.W. Wilton.
• Selection response in two breeding objectives of Ontario beef production. J.M. Howarth, S.P. Miller and J.W. Wilton.
• Customized selection indices for specific production systems and markets. M.T. Lazenby, S.P. Miller and J.W. Wilton.

Other

• CGIL discusses: the future of genetic improvement research. J.W. Wilton and M. Lazenby. Holstein Journal. November, 1997.

To view other articles published by CGIL researchers, visit our Publications section.

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