Influence of Grazing Intensity on Radiostrontium Concentrations in Milk

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Abstract
The effect of grazing intensity on radio- strontium concentrations in milk was studied by comparing milk of two groups of Holstein cows grazed rotationally. One group was included in the main herd, on a normal rotational grazing system, and the other group followed the main herd one plot behind. Milk samples from the group following the main herd showed a significant increase at the 1% level in strontium-90 units and strontium-89 units. A significant, positive linear correlation for S.U. 90 and S.U. 89 in milk between the groups was obtained. During the experimental period, a herd of Holstein cattle without access to pas- ture, consuming a weighed amount of feed, secreted 1.5% of their total strontium-90 intake into the milk.