Zinc provision of cows organisms on the farms of the south-eastern part of Belgorod region

During investigation of 358 cows on 4 farms of Belgorod southeast zone, zinc scarce content was revealed in blood serum. The greatest deficiency was in winter - at 95,1% cows. In Spring - deficiency decreased to 72,9%, in Summer - to 69,5%, in Autumn - to 59,5%. The elasticity loss and skin foldes, baldness, reproductive dysfuncion were noted.There were few mobile zinc forms in soils where forage crops were grown up. (the low level is the level