In order to overcome the refractory period of the ovary to c1oprostenol (ICI 80996) treatment (prior to day 4 and subsequent to day 14 of the oestrous cycle), ewes were treated with intravaginal progestagen sponges for eight days and injected…
In order to overcome the refractory period of the corpus luteum to prostaglandin (day 15 of the cycle through oestrus to day 3 of the next cycle), two injections each consisting of either 31,25 μg; 62,5 μg; 125 μg or…
The reproductive efficiencies of ewes treated with two injections of prostaglandin (cloprostenol) administered at intervals of either 9, 10 or 11 days, were compared. The conception rate of ewes in these treatment groups was 11,1%, 40,0% and 70,0%, respectively and…
In a 2 x 2 factorial experiment fertility has been compared after insemination on observed oestrus, and insemination on a time basis. It was done on 10-day intervals. A group of progestagen sponge (MAP) treated ewes was compared following insemination…
The reproductive efficiencies of ewes treated with the intravaginal progestagen sponge (MAP), an intravaginal progestagen sponge (MAP) followed by an injection of cloprostenol (125 μg), a double injection of 250 μg cloprostenol at a 9-day interval and a control group…
The control of oestrus and ovulation in sheep has been researched for more than 3 decades and still continues. Both in South Africa and abroad, much research has been done on the use of intravaginal progestagen sponges alone (Robinson, 1967;…
