Fig. 7.

Contamination of milk [1,2]. A contaminated haylage was supplied to the dairy cattle for 14 days and the radioactivity of the milk was measured. The radioactivity of the milk was detected immediately after the supply of the contaminated haylage and reached a plateau after 14 days. Then, the supply of contaminated haylage was stopped and only non-contaminated total mixed ration (TMR) feed mixture was supplied for another 14 days The radioactivity in the milk gradually decreased and the value was close to the control value after 14 days (N. Manabe et al.).