| Autor: |
Kanchev, L. N., Dobson, Hilary, Ward, W. R., Fitzpatrick, R. J. |
| Zdroj: |
Reproduction; November 1976, Vol. 48 Issue: 2 p341-345, 5p |
| Abstrakt: |
Summary.Testosterone, oestradiol and progesterone were measured in peripheral plasma during the oestrous cycle of 6 heifers. Oestradiol and progesterone results confirmed earlier reports. Concentration of testosterone on the day of oestrus was 40 ± 3 pg/ml (mean ± S.E.M.), and two peaks were detected during the cycle, one 7 days before oestrus (1809 ± 603 pg/ml) and the other (78 ± 7 pg/ml) on the day before the onset of oestrus. The concentration of progesterone declined in most cases 1 day after the maximum concentration of testosterone.Betamethasone treatment in 5 heifers extended luteal function by an average of 10 days: plasma androstenedione and oestradiol concentrations were unaltered; cortisol values were depressed for at least 16 days after treatment; testosterone concentrations were lowered by 13 ± 2·4% during treatment, and except in one heifer the peak on Day -7 was abolished. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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