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 Roussel, J. D. Articles by Stallcup, O. T. Search for Related Content PubMed PubMed Citation Articles by Roussel, J. D. Articles by Stallcup, O. T.

Blood Serum Enzymes Within the Estrous Cycle^{1, 2,}

Department of Animal Sciences, University of Arkansas, Fayetteville

ABSTRACT

Blood serum enzymatic activities in relation to the stages of estrous cycle have received too little investigation. Donayre and Pincus (4) reported that in humans, three enzymes, glutamic-oxalacetic transaminase (GrO-T), glutamic-pyruvic transaminase (GP-T), and alkaline phosphatase (ALP) showed significant variations among patients, suggesting that the sample was not drawn from a homogenous population. Davis et al. (3) reported that, in dairy cattle, GO-T level varied throughout the estrous cycle, with a tendency to peak at the 15th day, with a secondary peak during estrus. Glutamic-pyruvic transaminase levels were less variable within the cycle but, similar to GO-T, tended to peak at the 15th day. Recently, Roussel and Stallcup (5) reported no change in blood serum lipase within the estrous cycle of dairy cows.

Thirteen normal cycling dairy cows from the University of Arkansas dairy herd were used. Only one blood serum sample was taken from each cow at each stage of the cycle for assay of each enzyme.

¹ Supported by Grant GM-10654-03, National Institute of Health, U. S. Public Health Service.

² Approved by the Director, Arkansas Agricultural Experiment Station.

³ Present address: Department of Dairy Science, Louisiana State University, Baton Rouge, Louisiana.