Abstract

1. 1. Lipolytic rates expressed as μmol glycerol released per mg protein increased with body weight in Holstein steers. 2. 2. Lipolytic rates were greatest in both inner and outer back fat and lowest in omental, perirenal, and intermuscular fat depots. 3. 3. Epinephrine stimulated overall glycerol release 3-5-fold. 4. 4. Fasting resulted in greater basal lipolytic rates but epinephrine-stimulated rates tended to be greater for nonfasted steer adipose tissue. 5. 5. Lipolytic activity in adipose tissue seems to increase with growth and fattening, and differences in lipolytic rates between various depots diminish with growth.

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