Common sub‑clinical signs include:

• Poor coat condition or loss of pigmentation (“spectacle eyes”)
• Poor growth rates / ill‑thrift
• Reduced fertility and reduced immunity
• Bone weakness and general ill-thrift

Common sub‑clinical signs include:

• Steely wool (loss of crimp, harsh texture)
• Reduced growth and anaemia

Swayback in lambs (from deficiency in the ewe during pregnancy) - early stages can be sub‑clinical.

Cobalt deficiency leads to low vitamin B12 production in the rumen.

Sub‑clinical signs include:

• Poor appetite and reduced feed intake
• Poor growth / ill‑thrift
• Weakness and anaemia

Sheep are more susceptible than cattle.

Sub‑clinical signs include:

• Pine: poor appetite, lethargy, poor wool quality, poor thrift, slow growth
• Tear staining around the eyes
• Scaly skin at base of ears (early indicator)

Increased susceptibility to infection due to poor immunity

Sub‑clinical signs include:

• Reduced growth rates
• Increased stillbirth rate / reproductive issues (sub‑clinical before they become clinical)
• Poor immune function (increased susceptibility to disease)
• Retained placenta’s post calving

Sub‑clinical signs include:

• Poor growth and weak newborn lambs
• Reduced vigour in lambs and poor mothering (before full white muscle disease develops)

Sub‑clinical iodine deficiency may show as:

• Reduced fertility / poor conception rates
• Weak or hairless calves at birth (can begin sub‑clinically)
• Increased stillbirths / late abortion risk

Common sub‑clinical indicators include:

• Weak or unthrifty lambs at birth
• Hairy lambs or poor fleece quality at birth
• Increased perinatal mortality and stillbirths