For reasons too boring to explain we have a problem with Zolcal D supply, we hope to have it back within weeks.
It has highlighted that perhaps people were not really using the appropriate product for their situation and that there may be better or at the very least alternatives to Zolcal.
Zolcal D provides 35mg calcium/ml, 25 IU vitamin D3 / ml, plus 2mg/ml magnesium.
For chickens or birds outside natural sunligjht and complete diets should ensure that their viitamin D levels are OK. In which case the calcium can be supplied by using calcium lactate in the drinking water.
The commonly used dose of 2 teaspoonsful of Zolcal per litre provides approximately 250mg of calcium. Using calcium lactate a scoop contains about 550mg of calcium - ie double what is needed, so half a scoop per litre will provide the same amount of calcium.