Alloway, B. J. (1995). Heavy metals in soils. (2nd Edition). Blackie Academic and Professional. Glasgow, UK. Pp: 284–305.
Boila, R. J., Devlin, T. J. & Wittenberg, K. M. (1987). Geographical variation of the total sulfur content of forages grown in northwestern Manitoba. Canadian Journal of Animal Science 67(3): 869-872.
Borucki Castro, S. I., Lacasse, P., Fouquet, A., Beraldin, F., Robichaud, A. & Berthiaume, R. (2011). Short communication: Feed iodine concentrations on farms with contrasting levels of iodine in milk. Journal of Dairy Science 94: 4684–4689.
Capen, C. C. & Martin, S. L. (2003). The Thyroid Gland.In: Pineda, M. H. McDonald's veterinary endocrinology and reproduction (5thed., pp. 35-66). Lows, USA. Blackwell Science, Pp: 35-66.
Cihacek, L. J., Anderson, W. L. & Barak, P. W. (1996). Linkages between soil quality and plant, animal, and human health. In: R. D, S. Segoe. Methods for assessing soil quality (1st ed., pp. 5-15). Madison, USA, SSSA Special Publication.
Constable, P.D.; Hinchcliff, K.W.; Done, S.H. & Grümberg, W. (2017). Veterinary medicine, a textbook of the diseases of cattle, sheep, goat, pig and horses. 11th ed. St Louis Missouri: Elsevier.
Davies, B. E. & Houghton, N. J. (1983). The selenium content of Welsh soils with special reference to bedrock and contamination from sulphide ores, Minerals and the Environment 5(2-3): 67-70.
Deckers, J. & Steinnes, E. (2004). State of the art on soil related geo-medical issues in the world. Advances in agronomy 84: 1–35.
Froslie, A. (1990). Problems on deficiency and excess of minerals in animal nutrition, In: J. Lag. Geomedicine (1st ed., 37-60). Boca Raton, CRC Press.
Givens, D. I., Oven, E., Axford, R. F. E. & Omed, H. M. (2000). Forage evaluation in ruminant nutrition. (1st Edition). CABI Publishing, New York, USA. Pp: 352-356.
Jacobsen, J. S., Moore, T. G. & Bauder, J. W. (1998). Soil, plant and water analytical laboratories, montana agriculture montana state university, Extention service, Pp: 7-8.
Jakovljevia, M., Stevanovia, D., Blagojevia, S., Kostia, N. & Martinovia, L. j. (1995). The content of selenium in the soils of northern Pomoravlje, Symposium on Selenium. Serbian Academy of Sciences and Arts, Belgrade. Pp: 43-49.
Kalra, Y. P. & Maynard, D. G. (1998). Microwave digestion of plant tissue in an open vessel. In: Y.P., Kalra. Handbook of reference methods for plant analysis (1st ed., pp. 63-65). New York, USA. CRC Press.
Kelepertsis, A., Alexakis, D. & Kita, I. (2001). The environmental geochemistry of soils and waters of Susaki area, Korinthos, Greece. Environmental Geochemistry and Health 23(2): 117- 135.
Khan, Z. I., Hussain, A., Ashraf, M. & McDowell, L. R. (2006). Mineral status of soils and forages in southwestern Punjab-Pakistan: Micro-minerals. Asian-Australasian Journal of Animal Sciences 19(8): 1139-47.
Lewis, G. & Anderson, P. H. (1983). The nature of trace element problems: Delineating the field problem. Trace Elements in Animal Production and Veterinary Practice 7: 11-16
Lindsay, W. L. (1979). Chemical equilibria in soils, In: G., Faure. Principles and applications of geochemistry: a comprehensive textbook (2nd ed., pp. 373-383). New York, Prentice Hall.
Maddocks, S., Chandrasekhar, Y. & Setchell, B. P. (1985). Effect on wool growth of thyroxine replacement in thyroidectomized merino rams. Australian Journal Biological Science 38(4): 405-410.
McDowell, L. R. & Valle, G. (2000). Major minerals in forages. In: Givens, D.I.; Owen, E.; Oxford R.F.E. and Omed, H.M. Forage Evaluation in Ruminant Nutrition (1st ed., pp. 373-374). Wallingford, UK. CAB International.
McMurray, C. H. & Blanchflower, W. J. (1976). The levels of selenium and glutathione peroxidase activity in blood of sheep, cows and pigs. Research in Veterinary Science 20(2): 229-31.
Medeiros, G. N.; Targovnik, H. M. & Vassart, G. (1993). Defective thyroglobulin synthesis and secretion causing goiter and hypothyroidism, Endocrine Reviews 14(2): 165-83.
Mohebbi Fani, M., Nazifi, S. Ansari-Lari, M. & Namazi, F. (2010). Mixed mineral deficiencies in a dairy herd with subclinical production disorders. Comparative Clinical Pathology 19: 37-41.
Nolte, J. (2003). ICP Emission spectrometry: A practical guide (Paperback) (1st Edition). Wiley-VCH, USA. Pp: 49-50.
NRC. (2005). Mineral tolerance of animals In: National Research Council of the National Academies (2nd ed., 510). The National Academies Press, Washington D.C. Pp: 510.
NRC, (2007). Nutrient requirements of small ruminants: sheep, goats, cervids, and new world camelids. In: National Research Council of the National Academies (2nd ed., 384). The National Academies Press, Washington D.C.
Pastrana, R., McDowell, L. R., Conrad. J. H. & Wilkinson, N. S. (1991) Mineral status of sheep in the Paramo region of Colombia. Trace minerals. Small Ruminant Research 5(1-2): 23-34.
Paynter, D. I., Anderson, J. W. & McDonald, J. W. (1979). Glutathione peroxidase and selenium in sheep. II. The relationship between glutathione peroxidase and selenium-responsive unthriftiness in Merino lambs. Australian Journal of Agricultural Research 30(4): 703-709.
Piosik, P. A., Van Groenigen, M., Van Doorn, J., Baas, F. & de Vijlder, J. M. (1997). Effects of maternal thyroid status on thyroid hormones and growth in congenitally hypothyroid goat foetuses during the second half of gestation. Endocrinology 138(1): 5-11.
Rastmanesh, F., Zarasvandi, A., Rajabzadeh, N., Nikvand, A. A., Nori, M. & Asakereh, N. (2018). Study on relationship between copper, sulfur, iron, molybdenum and zinc of soil and forages with copper and zinc serum of sheep in Susangerd. Journal of Veterinary Research 73(3): 327-333. (In Persian)
Segar, M. (2012). Levels of sulfur as an essential nutrient element in the Soil Crop-Food System in Austria. Agriculture 2(4): 1-11.
Shetaya, W. H., Young, S. D., Watts, M. J., Ander, E. L. & Bailey, E. H. (2012). Iodine dynamics in soils. Geochim Cosmochim Acta 77: 457–473.
Troeh, F. R., Hobbs, J. A. & Donahue, R. L. (1991). Soil and water conservation (2nd Edition). Prentice-Hall, UK. Pp: 2-3.
Uttam, S., Abioye, F., Dennis, H. & Leticia, S. (2016). Selenium in Animal Nutrition: Deficiencies in Soils and Forages, Requirements, Supplementation and Toxicity. International Journal of Applied Agricultural Sciences 2(6): 112-125.
Voudouri, A. E., Chadio, S. E., Menegatos, J. G., Zervas, G. P., Nicol, F. & Arthur, J. R. (2003). Selenoenzyme activities in seleniumand iodine-deficient sheep. Biological Trace Element Research 94(3): 213-224.