Kanchanomai, R., Sirivejapundu, S. and Limpoka, M. (1986) “Study on Copper and Iron Serum Levels in Dairy Cows”., Agriculture and Natural Resources. Bangkok, Thailand, 20(3), pp. 314–317. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/242674 (accessed: 18 September 2026).