01779naa a2200253 a 450000100080000000500110000800800410001902400380006010000190009824501710011726000090028849000140029750000720031152009220038365000130130565000240131870000170134270000170135970000180137670000150139470000170140970000190142677300800144510512182019-09-25       2013    bl uuuu     u00u1 u    #d7 a10.1080/00288233.2013.8421762DOI1 aMULVANEY, F.J.  aComparison between the reproductive performance of ewe hoggets and mature ewes following a progesterone-based oestrus synchronization protocol.h[electronic resource]  c2013  a0028-8233  aArticle history: Received 27 May 2013 // Accepted 5 September 2013.  aABSTRACT.  Two experiments were conducted to compare the reproductive performance of ewe hoggets and mature ewes. All ewes were synchronized by an intravaginal progesterone-releasing device and bred together over a 5-day period. In Experiment 1, of those joined with the ram, more mature ewes ovulated (99% vs 68%; P < 0.05) with a higher ovulation rate (1.82 vs 1.14; P < 0.05) than ewe hoggets. Mature ewes had a higher pregnancy rate (98% vs 47%; P < 0.05) and lower early pregnancy loss (13% vs 41%; P < 0.05) than ewe hoggets. In Experiment 2, the ovulation rate (1.84 vs 1.44; P < 0.05) and pregnancy rate (86% vs 7%; P < 0.05) was higher in mature ewes compared with ewe hoggets. Combined, these studies help to quantify the difference in reproductive performance during breeding and pregnancy between ewe hoggets and mature ewes, and help to direct further research.  © 2013 The Royal Society of New Zealand.  aCORDEROS  aREPRODUCCION ANIMAL1 aMORRIS, S.T.1 aKENYON, P.R.1 aMOREL, P.C.H.1 aWEST, D.M.1 aVIÑOLES, C.1 aGLOVER, K.M.M.  tNew Zealand Journal of Agricultural Research, 2013gv.56, no.4, p. 288-296.