Thyroid hormones and their relationship to the dynamics of serum calcium and phosphorus in ewes treated with oxytocin after parturition

Bekeova, E.; Krajnicakova, M.; Hendrichovsky, V.

Slovensky Veterinarsky Casopis 21(4): 210-214


Accession: 002998061

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A 0.07 mg dose of the synthetic oxytocin analogue, carbetocin was injected i.m. into 9 ewes at 24 hours and also s.c. at 72 hours after parturition. In the 10 untreated controls the serum concentrations of triiodothyronine (T3) and thyroxine (T4) tended to decrease until day 21 after parturition and then to increase from day 25 to day 51. In the treated ewes the T3 values were higher, with the differences being significant on days 4, 17, 21 and 25; there were non-significant increases in T4 from day 7 to day 17 and significant decreases from day 21 to day 51. The serum Ca and P values were higher in the treated ewes than the controls. It was concluded that oxytocin stimulates the production of T3 and T4 and that these result in increases in the serum Ca and P levels and thus improve ewe fertility.