03547naa a2200289 a 450000100080000000500110000800800410001910000230006024501040008326000090018752027570019665000180295365000270297165000240299865000170302265000170303965000100305665000170306665000100308365000170309365000270311065300070313765300120314465300160315670000200317277300650319215230082024-01-09       1987    bl uuuu     u00u1 u    #d1 aGREYLING, J. P. C.  aSynchronization of oestrus in sheepbThe use of controlled internal drug release (CIDR) dispensers.  c1987  aAbstract: The use of the CIDR (controlled internal drug release) dispenser as a progestagen-synchronizing agent was evaluated in 37 Karakul ewes during the breeding season, using the intravaginal progestagen sponge as a control (30 ewes). Although there was no significant differences in oestrous response, following intravaginal insertion for 14 days, between these two progestagen devices, the time from device withdrawal to the onset of the induced oestrous period (31,2 vs 62,5 h) and the duration of the induced oestrous period (32,7 vs 47,4 h) was significantly (P&lt0,01) shorter in the CIDR dispenser group. The mean time from device withdrawal to the serum preovulatory LH peak and the interval from the onset of oestrus to the pre-ovulatory LH peak was significantly (P&lt0,01) earlier in the CIDR dispenser group (28,0 vs 78,0 hand 5,3 vs 17,3 h respectively). No significant difference in the serum progesterone concentrations was noted between the two groups. No significant difference in reproductive performance was obtained with conception, lambing rates and fecundities of 72,2 vs 79,3%; 75,0 vs 89% and 103,8 vs 113,0% for the dispenser and sponge treatment groups respectively. Results confirm the potential of the CIDR dispenser as an efficient synchronizing agent and the more concentrated synchrony obtained makes it ideal for fixed-time insemination.  Die gebruik van die CIDR-dispensor as 'n progestogeen-sinkronisasiemiddel is in 37 Karakoelooie tydens die teelseisoen geevalueer, met die intravaginale progestogeengei'mpregneerde spons as kontrole (30 ooie). Alhoewel daar geen betekenisvolle verskil in estrusrespons na intravaginale toediening vir 14 dae tussen die twee progestogeenbehandelings was nie, was die tydsduur vanaf die einde van behandeling tot die aanvang van estrus (31,2 vs 62,5 h) en die tydsduur van die gei'nduseerde estrusperiode (32,7 vs 47,4 h) betekenisvol (P&ltO,Ol) korter in die CIDR-dispensorgroep. Die gemiddelde tydsduur vanaf onttrekking tot die voor-ovulasie LH-piek en die interval vanaf die aanvang van estrus en die voor-ovulasie LH-piek was betekenisvol (P&lt0,01) vroeer in die CIDR-dispensorgroep (28,0 vs 78,0 h en 5,3 vs 17,3 h respektiewelik). Geen betekenisvolle verskil in die serum-progesteroonkonsentrasies is waargeneem tussen die twee groepe nie. Geen betekenisvolle verskil in vrugbaarheidsresultate is verkry met konsepsie, lampersentasie en fekunditeite van 72,2 vs 79,3%; 75,0 vs 89,7% en 103,8 vs 113,0% vir die CIDR-dispensor- en sponsbehandelingsgroepe respektiewelik. Resultate dui op die potensiaal van die CIDR-dispensor as 'n effektiewe sinkronisasiemiddel en die meer gekonsentreerde sinkronisasie verkry, maak dit ideaal vir uitvoering van KI op 'n vasgestelde tyd.  aEndocrinology  aEstrus synchronization  aLuteinizing hormone  aProgesterone  aReproduction  aSheep  aCiclo Estral  aOvino  aReprodução  aSincronização do Cio  aLH  aOestrus  aProgestagen1 aBRINK, W. C. J.  tSouth African Animal Sciencegv. 17, n. 3, p. 128-132, 1987.