PLASMA PROGESTERONE CONCENTRATIONS DURING PREGNANCY AND PARTURITION OF EWES GRAZING YARLOOP CLOVER
| Autor: | R. F. Seamark, J. M. Obst, C. J. Mcgowan |
|---|---|
| Rok vydání: | 1971 |
| Předmět: |
Infertility
Embryology medicine.medical_specialty Time Factors Birth weight Sheep Diseases Biology Endocrinology Animal science Pregnancy Internal medicine Grazing medicine Animals Birth Weight Progesterone Plant Poisoning Estrous cycle Labor Obstetric Sheep Domestic sheep reproduction Obstetrics and Gynecology Estrogens Cell Biology medicine.disease Dystocia medicine.anatomical_structure Reproductive Medicine Pregnancy Animal Gestation Female Corpus luteum |
| Zdroj: | Reproduction. 26:259-262 |
| ISSN: | 1741-7899 1470-1626 |
| DOI: | 10.1530/jrf.0.0260259 |
| Popis: | Summary. Progesterone concentrations in the peripheral plasma of pregnant ewes grazing oestrogenic (yarloop clover) and non-oestrogenic (rye grass) pastures were compared. Whilst the overall pattern of plasma progesterone throughout pregnancy in the two groups was similar, the mean of values determined from the 90th day of gestation in ewes on yarloop was significantly lower than those on grass. No significant differences were recorded in the length of pregnancy or birth weight of lambs (P>0\m=.\05)although some evidence of maternal dystocia was obtained for the ewes on yarloop. In relation to parturition, mean plasma progesterone values in both groups began to fall 96 hr before birth, at first gradually then rapidly in the 16 hr preceding birth. Ewes on grass had a higher (P |
| Databáze: | OpenAIRE |
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