Tony Seykora

Mousa, M.S., A.J. Seykora, M.A. Abdellatif, and E.F. Mousa. 2015. Heritability and genetic correlations of age at first calving as affected by calf-hood fitness and health traits in Holstein heifers.  Internatl. Conf. of Anim. Production, Hurghada, Egypt and Egyptian J. Anim. Prod. 52:37-43.

Hazel, A.R., B.J. Heins, A.J. Seykora, and L.B. Hansen. 2014. Production, fertility, survival, and body measurements of Montbeliarde-sired crossbreds compared with pure Holsteins during their first 5 lactations. J. Dairy Sci: 97: DOI: 10.3168/jds.2013-7063, published online Feb. 3, 2014.

Hazel, A.R., B.J. Heins, A.J. Seykora, and L.B. Hansen. 2013. Montbeliarde-sired crossbreds compared with pure Holsteins for dry matter intake, production, and body traits during the first 150 days of first lactation. J. Dairy Sci. 96(3):1915-1923.

Heins, B.J., L.B. Hansen, A.R. Hazel, A.J. Seykora, D.G. Johnson, and J.G. Linn. 2012. Short communication: Jersey × Holstein crossbreds compared with pure Holsteins for body weight, body condition score, fertility, and survival during the first three lactations. 95(7): 4130-4135.

Heins, B.J., L.B. Hansen, A.J. Seykora, A.R. Hazel, D.G. Johnson, and J.G. Linn. 2011. Jersey × Holstein crossbreds compared with pure Holsteins for production, mastitis, and body measurements during the first 3 lactations. J. Dairy Sci. 94:501-506.

Attalla, S.A., A.J. Seykora, J.B. Cole, and B.J. Heins. 2010. Genetic parameters of milk ELISA scores for Johne's disease. J. Dairy Sci. 93(4):1729-1735.

Heins, B.J., L.B. Hansen, A.R. Hazel, A.J. Seykora, D.G. Johnson, and J.G. Linn. 2010. Birth traits of pure Holstein calves versus Montbeliarde-sired crossbred calves. J. Dairy Sci. 93:2293-2299.

Heins, B.J., L.B. Hansen, A.J. Seykora, A.R. Hazel, D.G. Johnson, and J.G. Linn. 2008. Crossbreds of Jersey × Holstein compared with pure Holsteins for body weight, body condition score, dry matter intake, and feed efficiency during the first one hundred fifty days of first lactation. J. Dairy Sci. 91:3716-3722.

Heins, B.J., L.B. Hansen, A.J. Seykora, D.G. Johnson, J.G. Linn, J.E. Romano, and A.R. Hazel. 2008. Crossbreds of Jersey × Holstein compared to pure Holsteins for production, fertility, and body and udder measurements during first lactation. J. Dairy Sci. 91:1270-1278.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2006. Calving difficulty and stillbirths of pure Holsteins versus crossbreds of Holstein with Normande, Montbeliarde, and Scandinavian Red. J. Dairy Sci. 89: 2805-2810.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2006. Fertility and survival of pure Holsteins versus crossbreds of Holstein with Normande, Montbeliarde, and Scandinavian Red. J. Dairy Sci. 2006 89: 4944-4951.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2006. Production of pure Holsteins versus crossbreds of Holstein with Normande, Montbeliarde, and Scandinavian Red. J. Dairy Sci. 89: 2799-2804.

Reneau, J.K., A.J. Seykora, B.J. Heins, M.I. Endres, R.J. Farnsworth, and R.F. Bey. 2005. Association between hygiene scores and somatic cell scores in dairy cattle. JAVMA 227:8.

Chrystal, M.A., A.J. Seykora, L.B. Hansen, A.E. Freeman, D.H. Kelley, and M.H. Healey. 2001. Heritability of teat-end shape and the relationship of teat-end shape with somatic cell score for an experimental herd. J. Dairy Sci. 84:2549-2554.

Chrystal, M.A., A.J. Seykora, and L.B. Hansen. 1999. Heritabilities of teat-end shape and teat diameter and their relationships with somatic cell score. J. Dairy Sci. 82:2017-2022.

Hansen, L.B., J.B. Cole, G.D. Marx, and A.J. Seykora. 1999. Productive life and reasons for disposal of Holstein cows selected for large versus small body size. J. Dairy Sci. 82:795-801.

Stahl, T.J., B.J. Conlin, A.J. Seykora, and G.R. Steuernagel. 1998. Characteristics of Minnesota dairy farms in a transitory period. J. Dairy Sci. 82:45-51.

Young, C.W. and A.J. Seykora. 1996. Estimates of inbreeding and relationship among registered U.S. Holstein females. J. Dairy Sci. 79:502.

Seykora, A.J. Revised 2022. Practical Techniques for Dairy Farmers. 4th Edition. 111 pages.

Seykora, A.J. (contributor). 2017. Chapter 8-Genetics, Chapter 9-Animal Breeding, Chapter 10-Biotechnology and Genetic Engineering, and Chapter 17-Dairy Cattle. In: Introduction to Animal Science (6th Edition), W. Stephen Damron, Ed. (Required textbook for ANSC 1101: Introductory Animal Science.)

Seykora, A.J. et. al., 2020. Learning About Dairy. This book helps 4-H members learn about their dairy animals and is a reference for the Dairy Knowledge Bowl. It is also a reference for the FFA Dairy Career Development Event (CDE).

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2006. Fertility and survival during first lactation of crossbred dairy cows sired by bulls from Swedish, Norwegian, and French Red breeds compared to pure Holstein cows. 8th World Genetic Congress. Belo Horizonte, Brazil.

Seykora, A.J. and B. Heins. 2004. Limiting factors for more profitable dairy cows in the United States. Proc., National Dairy Genetics Workshop, Raleigh, NC. Oct. 20, 2003 (published in 2004).

Van Randen, P.M. and A.J. Seykora. 2003. Net Merit as a measure of lifetime profit: 2003 revision. AIPL Research Report NM$2 (7-03). Fourteen pages found at http://www.aipl.arsusda.gov/reference/nmcalc.htm.

Mousa, M., A. Seykora, H. Chester-Jones, D. Ziegler, and J. Cole. 2013. Heritability estimates of performance and health traits of Holstein calves. J. Dairy Sci. 93(E-Suppl. 1):291.

Hazel, A.R., L.B. Hansen, B.J. Heins, A.J. Seykora, D.G. Johnson, and J.G. Linn. 2010. Jersey-sired and Montbeliarde-sired crossbred heifers compared to pure Holstein heifers for survival, and fertility from birth to first parturition. J. Dairy Sci. Vol. 93 (E-Suppl. 1): 470.

Heins, B.J., L.B. Hansen, A.R. Hazel, A.J. Seykora, D.G. Johnson, and J.G. Linn. 2010. Jersey x Holstein crossbred cows compared to pure Holstein cows for calving traits, production, fertility, survival, and udder measurements during the first three lactations. J. Dairy Sci. Vol. 93 (Suppl. 1): 20.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2010. Survival, fertility, and production of Normande x Holstein, Montbeliarde x Holstein, and Scandinavian Red x Holstein crossbreds cows compared to pure Holstein cows. 9th World Congress on Genetics Applied to Livestock Production, Leipzig, Germany. Communication 843.

Attalla, S.A., A.J. Seykora, J.B. Cole, and B.J. Heins. 2009. Estimation of genetic parameters and transmitting ability for Minnesota Johne's milk ELISA test. ADSA/ASAS Joint Meeting, Montreal, Quebec. Abstr. M56 (Oral presentation).

Hazel, A.R., B.J. Heins, L.B. Hansen, A.J. Seykora, D.G. Johnson, J.G. Linn, and J.E. Romano. 2009. Montbeliarde-sired crossbred cows compared to pure Holstein cows for body weight, body condition score, hip height, dry matter intake, and production during the first 150 days of first lactation. ADSA/ASAS Joint Meeting, Montreal, Quebec. Abstr. 743 (Oral presentation).

Heins, B.J., L.B. Hansen, A.R. Hazel, A.J. Seykora, D.G. Johnson, and J.G. Linn. 2009. Calving traits, gestation length, and birth weight of Montbeliarde sires mated to Holstein or Jersey x Holstein crossbreds. ADSA/ASAS Joint Meeting, Montreal, Quebec. Abstr. 742 (Oral presentation).

Heins, B.J., L.B. Hansen, A.R. Hazel, A.J. Seykora, D.G. Johnson, and J.G. Linn. 2009. Jersey x Holstein crossbred cows compared to pure Holstein cows for fertility and survival during the first three lactations. ADSA/ASAS Joint Meeting, Montreal, Quebec. Abstr. 738 (Oral presentation).

Heins, B.J., L.B. Hansen, A.R. Hazel, A.J. Seykora, D.G. Johnson, and J.G. Linn. 2009. Jersey x Holstein crossbred cows compared to pure Holstein cows for production, SCS, and udder measurements during the first three lactations. ADSA/ASAS Joint Meeting, Montreal, Quebec. Abstr. 739 (Oral presentation).

Hazel, A.R., B.J. Heins, L.B. Hansen, A.J. Seykora, D.G. Johnson, J.G. Linn, and J.E. Romano. 2008. Montbeliarde-sired crossbred cows compared to pure Holstein cows for production, SCS, days open, and body condition score during their first two lactations. J. Dairy Sci. 91(Suppl. 1):762 (Oral presentation).

Heins, B.J., A.R. Hazel, L.B. Hansen, A.J. Seykora, A.R. Hazel, D.G. Johnson, J.G. Linn, and J.E. Romano. 2008. Jersey x Holstein crossbred cows compared to pure Holstein cows for production, SCS, days open, body condition score, and udder measurements during the first three lactations. J. Dairy Sci. 91(Suppl. 1):763 (Oral presentation).

Heins, B.J., L.B. Hansen, A.J. Seykora, A.R. Hazel, A.G. Linn, and D.G. Johnson. 2007. Crossbreds of Jersey/Holstein compared to pure Holsteins for production, fertility, and udder traits during first lactation. J. Dairy Sci. 90(Suppl. 1):420.

Johnson, D.G., B.J. Heins, L.B. Hansen, A.J. Seykora, and J.G. Linn. 2007. Body weight and condition score of four dairy genetic groups in the summer or winter under low-input management. Dairy Sci. 90(Suppl. 1):540.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2006. Crossbreds of Normande-Holstein, Montbeliarde-Holstein, and Scandinavian-Holstein compared to pure Holsteins for 305-d production. J. Dairy Sci. 89(Suppl. 1):252.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2006. Crossbreds of Normande-Holstein, Montbeliarde-Holstein, and Scandinavian-Holstein compared to pure Holsteins for reproduction and survival. J. Dairy Sci. 89(Suppl. 1):252.

Heins, B.J., L.B. Hansen, A.J. Seykora, A.R. Hazel, J.G. Linn, M.L. Raeth-Knight, and W.P. Hansen. 2006. Crossbreds of Jersey/Holstein compared to pure Holsteins for body weight, dry matter, feed efficiency, and body condition score. J. Dairy Sci. 89(Suppl. 1):250.

Heins, B.J., L.B. Hansen, A.J. Seykora, A.R. Hazel, J.G. Linn, M.L. Raeth-Knight, and W.P. Hansen. 2006. Crossbreds of Jersey/Holstein compared to pure Holsteins for production, calving difficulty, stillbirths, and fertility. J. Dairy Sci. 89(Suppl. 1):251.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2005. Crossbreds of Normande-Holstein, Montbeliarde-Holstein, and Scandinavian-Holstein compared to pure Holsteins for days to first breeding, first service conception rate, days open and survival. J. Dairy Sci. 88(Suppl. 1):97.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2005. Crossbreds of Normande-Holstein, Montbeliarde-Holstein, and Scandinavian-Holstein compared to pure Holsteins for dystocia and stillbirths. J. Dairy Sci. 88(Suppl. 1):96.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2005. Crossbreds of Normande-Holstein, Montbeliarde-Holstein, and Scandinavian-Holstein compared to pure Holsteins for production during the first 150 days of first lactation. J. Dairy Sci. 88(Suppl. 1):95.

Johnson, D., E. Ballinger, J. Linn, M. Rudstrom, L. Hansen, A. Seykora, and B. Heins. 2005. Evaluation of low input dairy farming systems by on-farm research, protyping, and simulation modeling with emphasis on grazing management, seasonal calving, crossbreeding and outwintering. J. Anim. Sci. 98 (Suppl. 1), Midwest Meetings.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2004. Comparison of first-parity Holstein, Normande-Holstein crossbred, Montbeliarde-Holstein crossbred, and Scandinavian-Holstein crossbred cows for dystocia and stillbirths. J. Dairy Sci. 87(Suppl. 1):524.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2004. Crossbreds of Normande-Holstein, Montbeliarde-Holstein, and Scandinavian-Holstein compared to pure Holsteins for production and SCS during the first 150 days of production. J. Dairy Sci. 87(Suppl. 1):41.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2004. Minnesota 4-H Gopher Dairy Camp: A youth learning experience. J. Dairy Sci. 87(Suppl. 1):385.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2004. Normande-Holstein crossbred versus pure Holsteins for conception, days open, calving interval, and survival. J. Dairy Sci. 87(Suppl. 1):535.

Seykora, A.J., B.J. Heins, L.B. Hansen, J.G. Linn, D.G. Johnson, and W.P. Hansen. 2004. Effect of Holstein females carrying Holstein versus Jersey sired calves on subsequent MEMilk, days open, and involuntary culling. J. Dairy Sci. 87(Suppl. 1):282. Abstract 527.

Heins, B.J., L.B. Hansen, and A.J. Seykora. 2003. Comparison of Holstein, Holstein-Jersey crossbred, and Holstein-Normande crossbred first-parity cows for milk, fat, and protein production and SCS during the first 150 days of lactation. J. Dairy Sci. 86(Suppl. 1):157.

Raeth-Knight, M.L., J.G. Linn, D.G. Johnson, L.B. Hansen, A.J. Seykora, B.J. Heins, and R.M. Templeton. 2003. Performance of Holstein and Holstein-Jersey crossbred heifer calves from birth to 84 days of age. J. Dairy Sci. 86(Suppl. 1):87.

Seykora, A.J. and B.J. Heins. 2002. Evaluating 4-H dairy animals for a combination of type and genetic value for Net Merit dollars. J. Dairy Sci. 85(Suppl. 1):495.

Templeton, R.M., J.G. Linn, A.J. Seykora, and B.J. Heins. 2002. Comparison of Holstein and Holstein-Jersey crossbred heifer calves for body weight, hip height, and average daily gain from birth to 56 days of age. J. Dairy Sci. 85(Suppl. 1):1634.

Chrystal, M.A., Y. Da, L.B. Hansen, and A.J. Seykora. 2001. Accuracy of marker assisted selection using a mixed model method. J. Dairy Sci. 84(Suppl. 1):191.

Heins, B.J., L.B. Hansen, A.J. Seykora, and G.D. Marx. 2001. Calving disorders of Holstein cows selected for large versus small body size. J. Dairy Sci. 84(Suppl. 1):246.

Sonnek, E.N., L.B. Hansen, and A.J. Seykora. 2001. Evaluation of corrective mating programs for dairy cattle in the U.S. J. Dairy Sci. 84(Suppl. 1):24.

Seykora, A.J. 2014. Breeding more profitable cows. Dairy Star, Vol. 15, No. 22.