Cobalt deficiency in ewes linked to reduced lamb vigour

Sheep producers are being advised to increase forage testing prior to tupping following research that links hidden cobalt deficiencies in ewes to reduced vigour in lambs.

Cobalt is essential for the synthesis of vitamin B12 by rumen microorganisms. A deficiency can lead to anaemia, weight loss, and poor growth rates in sheep. Because cobalt levels in grassland soils are highly variable and influenced by factors such as soil acidity, rainfall, and organic matter, sub-clinical deficiencies can occur without obvious symptoms.

Research by SAC indicates that lambs born to ewes with sub-clinical cobalt deficiency exhibit lower activity levels, less exploration, and less frequent nosed contact with their mothers during their first three days. These behaviors are critical indicators of whether a newborn is successfully consuming colostrum. Experts recommend soil and forage analysis to identify mineral levels, suggesting supplementation via feed blocks or mineral buckets if deficiencies are detected.