| Autor: |
Schmitt, Dennis, Garverick, H. A., Mather, E. C., Sikes, J. D., Day, B. N., Erb, R. E. |
| Zdroj: |
Journal of Animal Science; February 1975, Vol. 40 Issue: 2 p261-268, 8p |
| Abstrakt: |
Induced parturition was studied in eight 2-year-old heifers and 16 cows to determine the effect of induced parturition on reproductive performance and milk production. All animals were randomly assigned to either a control or treatment group within age, number of lactations and previous milk production groups. The treatment group received 20 mg dexamethasone and 8 mg estradiol benzoate 6 to 12 days prior to their expected calving dates. Treatment with dexamethasone plus estradiol benzoate shortened gestation length and increased the incidence of retained placentas (P < .01). No differences were found in dystocias, time for uterine involution, calving interval or services per conception.Plasma corticoids peaked on the day of parturition in control cows but were suppressed for 48 hr by the injection of dexamethasone. Plasma progestins fell sharply and similarly in both groups 2 days before calving (P < .01). Plasma estradiol (P < .01) and urinary estrogen excretion (P < .05) in the induced group were lower than the controls prior to parturition. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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