PMID: 9542806May 16, 1998Paper

Activities of the enzymes LDH, gamma-GT, GOT, GPT and lactoperoxidase in the milk of breeding mares during the course of lactation

Berliner und Münchener tierärztliche Wochenschrift
E RielandH Enbergs

Abstract

Milk samples were collected from 44 mares (trotters, warm blood horses, quarter horses) during lactation between the 1st and 90th day p.p. at 20 defined days. The activity of the enzymes LDH, gamma-GT, GOT, GPT and lactoperoxidase was investigated. The aim of this study was to find out the changes of these parameters during lactation and whether an influence of race, conception, date of foaling, age and number of lactations existed on the enzyme activities in mare's milk. The following results were obtained: In mare's milk the LDH-activity was highest (xg = 629 x 1.5 +/- 1 U/l) on the 1st day p.p. and showed a marked decrease on the 3rd day p.p. followed by a slight decrease until the 20th day p.p. It remained then at a constant level of about 80 U/l. The lowest activity (xg = 65.2 x 1.51 +/- 1 U/l) was measured on the 76th day p.p. The influence of conception and date of foaling time were statistically significant. The gamma-GT-activity was highest on the 3rd day p.p. (xg = 143.4 x 1.45 +/- 1 U/L) and decreased during lactation. The lowest activity was measured on the 90th day p.p. (xg = 23.2 x 1.51 +/- 1 U/L). The influence of race and conception--time were statistically significant. The GOT-activity of the 1st day p.p. (xg =...Continue Reading

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