01733naa a2200289 a 450000100080000000500110000800800410001902400280006010000170008824500910010526000090019652009390020565000110114465000150115565000140117065000170118465000170120165000100121865000100122865000240123865300170126265300290127965300230130870000170133170000200134877300750136815162202023-06-22       1990    bl uuuu     u00u1 u    #d7 a10.1071/rd9900173.2DOI1 aDAVIS, S. R.  aEffects of growth hormone injections on ovulation rate in ewes.h[electronic resource]  c1990  aCoopworth ewes were either treated with 5 mg recombinant-derived bovine growth hormone per day for each day of the oestrous cycle or were untreated. Ovulation rates at the pre-treatment, post-treatment and a subsequent oestrus were determined by endoscopy. These were 1.34, 1.51, 1.38 for the treated ewes and 1.32, 1.43, 1.39 for the control ewes. The ovulation rate post-treatment was significantly higher than for the other two cycles in the treated ewes but it was not significantly different from the post-treatment value of the control ewes. Plasma concentrations of insulin-like growth factor-I (IGF-I) were elevated during treatment (90-130 nmol L-1) compared with concentrations of 25-50 nmol L-1 in the control ewes. No relationship was found between plasma IGF-I concentration and ovulation rate. Injection of ewes grazing ryegrass/white clover pasture with bovine growth hormone did not result in increased ovulation rate.  aEstrus  aMetabolism  aOvulation  aPharmacology  aReproduction  aSheep  aOvino  aReprodução Animal  aDrug effects  aHormônio de crescimento  aTaxa de ovulação1 aSMITH, J. F.1 aGLUCKMAN, P. D.  tReproduction, Fertility and Developmentgv. 2, n. 2, p. 173-178, 1990.