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THE PLASMA ZINC CONCENTRATION OF NONPREGNANT, PREGNANT AND PARTURIENT HEREFORD CATTLE
Author(s) -
Dufty J. H.,
Bingley J. B.,
Cove Linda Y.
Publication year - 1977
Publication title -
australian veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.382
H-Index - 59
eISSN - 1751-0813
pISSN - 0005-0423
DOI - 10.1111/j.1751-0813.1977.tb07935.x
Subject(s) - zinc , zoology , pregnancy , reproduction , biology , estrous cycle , plasma concentration , endocrinology , chemistry , ecology , genetics , organic chemistry
SUMMARY Studies were made on several groups of Hereford cattle to determine the plasma zinc concentration at various phases of their reproductive life. In nonpregnant heifers a major cause of variation was due to differences between individual animals. Seasonal changes were also evident but little difference was noted in the zinc levels of cattle sampled at particular stages of the oestrous cycle or over a 24‐hour period. Following conception, the plasma zinc levels remained relatively constant until late in pregnancy when a decline occurred. A more marked decline occurred during the perlparturient period although the trends observed differed between animals that calved normality and those that suffered from dystocia. Samples obtained from calves approximately 24 hours after delivery contained zinc at concentrations of more than double that recorded for their dams.