Abstract
The effect of additional dietary Zn (90 mg kg−1 as ZnO) on lipolysis and mineral content of the milk were investigated in a feeding trial in a cross-over design with 8 cows in mid-late lactation. Zinc supplementation did not affect the content of free fatty acids (FFA) in the milk measured immediately after milking but it significantly (P < 0.01) decreased the development of FFA during cold storage for 72 h. Zn supplementation significantly (P < 0.01) increased the Zn concentration in the cream but not in the skim milk fraction, supporting our hypothesis that the effect of Zn may be associated with an effect in the milk fat globule membrane. It is argued that Zn deficiency may be a potential risk factor with regard to predisposition to spontaneous lipolysis of the milk when dietary Zn intake is close to the recommended levels, but the data are not conclusive.
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