Subclinical iron deficiency often goes unnoticed because it is nearly impossible to diagnose through clinically observed symptoms only; however, full-scale iron-deficiency anaemia is detectable through clinical symptoms only, while the piglet’s health condition has often deteriorated quite severely before being noticed. Therefore, testing for blood haemoglobin levels allows practical and early detection of subclinical iron deficiency in piglets, allowing swine producers to administer additional supplemental injectable iron in order to treat the subclinical iron deficiency and virtually eliminate the development of full-scale iron-deficiency anaemia in piglets. Pen-side or laboratory evaluation of the haemoglobin level in a blood sample taken from a vein will indicate whether or not the piglets are suffering from subclinical or full-scale iron-deficiency anaemia.
Once visual signs of anaemia are detected through clinically observed symptoms only, the immune-system status and the growth rates of piglets have already been adversely affected quite significantly.