Basal levels and diurnal variations of some hormones and metabolites in blood of dairy cows treated daily with rbSTin early and late lactation

The variations of basal value (before morning feeding at 3-4 days interval) and daily pattern (on 4and 18day of treat-  ment with 8 blood collections within 24h) of hormones and metabolites were studied in four dairy cows; 2 in early and  2 in late lactation, which were alternatively injected daily for a period of 21 days with 26.3 mg rbS

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