HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Bachman, K. C. Search for Related Content PubMed PubMed Citation Articles by Bachman, K. C.

Effect of Exogenous Estradiol and Progesterone upon Lipase Activity and Spontaneous Lipolysis in Bovine Milk¹

Dairy Science Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville 32611

ABSTRACT

Three of six lactating Jersey cows received estradiol—17ß and progesterone (.10 and .25 mg/kg body weight per day subcutaneously for 7 consecutive days. Lipase activity and acid degree were determined for morning milk samples stored 24 h at 4°C. Whole milk lipase activity did not increase over control milk samples; however, lipase activity of cream fraction and percent whole milk lipase activity in cream fraction increased 200 and 100%. Increases in acid degree occurred also and were closely correlated (.8 to .9) with lipase activity of cream fraction and percent whole milk lipase activity in cream fraction. Cooling was not required to effect association of lipase with cream fraction. Two treated cows developed mastitis-like symptoms after elevation in lipase activity of cream fraction and acid degree. Estradiol alone evoked similar responses.

¹ journal Series No. 2975, Florida Agricultural Experiment Station.