Andrieu, S. 2008. Is there a role for organic trace element supplements in transition cow health? Vet. J. 176:77-83.
Ansotegui, R. P., J. D. Bailey, J. A. Paterson, P. G. Hatfieldand and C. K. Swenson 1999. Effects of supplemental trace mineral form on copper status, estrus, ovulation rate, and fertility in beef heifers. Am. Soc. Anim. Sci. 50:189-192.
AOAC. 2000. Official methods of analysis. Association of Official Analytical Chemists, 17th ed. Arlington, VA, USA.
Boland, M. P. and P. Lonergan. 2003. Trace minerals in production and reproduction in dairy cows. Adv. Dairy Sci. Tech. 15:19-33.
INRA. 1989. Ruminant nutrition. Recommended Allowances and Feed Tables. INRA, Paris.
Kincaid, R. L. and M. T. Socha. 2004. Inorganic versus complexed trace mineral supplements on performance of dairy cows. Prof. Anim. Sci. 20:66-73.
Malleson, E. R., R. Meeske, L. J. Erasmus, W. A. Van Niekerkand and R. J. Coertze. 2008. Fish meal supplementation to early lactation Jersey cows grazing ryegrass pasture. South Afr. J. Anim. Sci. 38:331-341.
Meeske, R., A. Rothauge, G. D. Van der Merwe and J. F. Greyling. 2006. The effect of concentrate supplementation on the productivity of grazing Jersey cows on a pasture based system. South Afr. J. Anim. Sci. 36:105-110.
NRC. 2001. Nutrient requirements of dairy cattle, 7th revised ed. National Academy Press, Washington, DC.
Patton, J., D. A. Kenny, J. F. Mee, F. P. O'Mara, D. C. Wathes, M. Cook and J. J. Murphy. 2006. Effect of milking frequency and diet on milk production, energy balance and reproduction in dairy cows. J. Dairy Sci. 89:1478-1487.
Rabiee, A. R., I. J. Lean, M. A. Stevenson and M. T. Socha. 2010. Effects of feeding organic trace minerals on milk production and reproductive performance in lactating dairy cows: a metaanalysis. J. Dairy Sci. 93:4239-4251.
Ramirez, R. G., G. F. W. Haenlein and M. A. Nunez-Gonzalez. 2000. Seasonal variation of macro and trace mineral contents in 14 browse species that grow in northeastern Mexico. Small Rumin. Res. 39:153-159.
SAS. 2004. SAS/STAT 9.13 User's Guide. Statistical Analysis System Inst, Cary, NC.
Siciliano-Jones, J. L., M. T. Socha, D. J. Tomlinson and J. M.DeFrain. 2008. Effect of trace mineral source on lactation performance, claw integrity, and fertility of dairy cattle. J. Dairy Sci. 91:1985-1995.
Soto, R., I. Rubio, C. S. Galina, E. Castillo and S. Rojas. 2001. Effect of pre- and post-partum feed supplementation on the productive and reproductive performance of grazing primiparous Brahman cows. Trop. Anim. Health Prod. 33:253-264.
Spears, J. W. and W. P. Weiss. 2008. Role of antioxidants and trace elements in health and immunity of transition dairy. Vet. J. 176:70-76.
Tufarelli, V., M. Dario and V. Laudadio. 2009. Milk yield and composition of lactating Comisana ewes fed total mixed rations containing nitrogen sources with different ruminal degradability. Livest. Sci. 122:349-353.
Tufarelli, V., R. U. Khan and V. Laudadio. 2011. Vitamin and trace element supplementation in grazing dairy ewe during the dry season: effect on milk yield, composition, and clotting aptitude. Trop. Anim. Health Prod. 43:955-960.
Van Keulen, J. and B. A. Young. 1977. Evaluation of acidinsoluble ash as a natural marker in ruminant digestibility studies. J. Anim. Sci. 44:282-287.
Van Soest, P. J., J. B. Robertson and B. A. Lewis. 1991. Methods for dietary fiber, neutral detergent fiber, and non-starch polysaccharides in relation to animal nutrition. J. Dairy Sci. 74:3583-3592.
Van Soest, P. J. and J. B. Robertson. 1985. Analysis of forages and fibrous feeds. In: Laboratory Manual for Animal Science 613. Cornell University, Ithaca, NY.
Zannoni, M. and S. Annibaldi. 1981. Standardization of the renneting ability of milk by Formagraph. Sci. Tecn. Latt-Cas. 32:79-94.
Zhang, Z., G. Liu, X. Li, G. Li, C. Guo, H. Wang and Z. Wang. 2010. Evaluation of the change of serum copper and zinc concentrations of dairy cows with subclinical ketosis. Biol. Trace Elem. Res. 138:8-12.