[Thyroliberin injected into pregnant heifers increase birthweight and stimulate postnatal growth of calves].
Birthweight (51 +/- 2 kg) and mean daily weight gain (1,306 +/- 77 g; measured during the first 120 days of postnatal life) in 8 male calves born from eight primiparous heifers (mated with the same bull) given subcutaneous TRH injections (25 micrograms/kg body wt) on days 230, 240, 250 and 265 of gestation were significantly higher (+10%) than those measured in 7 control male calves born from the same bull (47 +/- 1 kg and 1147 +/- 89 g, respectively). TRH treatment also significantly increased plasma IGF1 concentrations both in term cows and in newborn calves.
D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development*; D001724:Birth Weight / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D002417:Cattle; D005260:Female; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000187:drug effects*; D013973:Thyrotropin-Releasing Hormone / Q000494:pharmacology*
D013973:Thyrotropin-Releasing Hormone
La thyrolibérine injectée à la vache gestante augmente le poids de naissance et stimule la croissance postnatale des veaux.