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 influence of two stocking rates on diet composition and intake of sheep in a three camp rotational grazing system in the central Orange Free State A study was made of the nutritive value of native pasture for sheep in…
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…
A trial was conducted in which the rations of sheep were supplemented with different levels of Cu and Mo. The S intake was kept constant at 2,1 g/sheep/day. Two levels of Mo were fed, viz. 38 mg/sheep/day for 92 days…
Different levels of dietary S were supplied to sheep receiving high levels of Cu (55 mg/sheep/day) and Mo (34 mg/sheep/day) in their rations. At S intakes of 2,9,4,0 and 5,3 g/sheep/day the hepatic Cu retentions expressed as percentages of total…
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…
Keywords: Technique, infusion, sheep
A stepwise adaptation experiment was performed on 5 adult sheep fed ad libitum on successive diets containing 10; 26,5; 43,5; 54 to a final diet containing 65% maize meal and molasses for ll9 days. All diets contained a mixed buffer…
Dried poultry manure from batteries ( DPM) was included at 0,0, 11,6, 23,5 and 35,4% in sheep finishing rations. An increase in the DPM content of rations caused substantial increase in the concentrations of calcium (Ca), phosphorus (P), sulphur (S),…
The families of TGF-β proteins are the most important growth factors in the ovary for growth and differentiation of early ovarian follicles. Three related oocyte-derived members of the transforming growth factor-β superfamily, namely GDF9, BMP15 and BMPR-IB have been shown…
The question is posed of the applicability to cattle feeding, of digestibility data obtained with sheep. An experiment is described where the same high concentrate diet was fed at three levels, equalised per kg body mass between species. In energy…
Hormone sensitive lipase is thought to be the rate-limiting enzyme of lipolysis; phosphatidate phosphohydrolase that of lipogenesis. Both these enzyme systems were studied in vitro with the addition of epinephrine. The results show that: (a) hormone sensitive lipase is four…
Sixty Merino lambs weighing 25 kg were randomly allotted to six different feeding levels as follows: ad libitum, 80%, 71%, 65%, 55% and 45% ad libitum. Individual intakes and live masses were determined weekly. From 25 - 33 kg live…
In the Karakul sheep of Southern Africa four major pelt types can be identified, namely pipe curl, developed shallow curl, shallow curl and watersilk types. A study of the foetal skin was undertaken to determine whether histological differences do exist…
Data of all the lambs born to the Elsenburg Dormer (n = 303) and SA Mutton Merino (n = 325) flocks during the 1977 and 1978 lambing seasons as well as their female relatives were used to study various aspects…
Data of all the ram lambs born to the Elsenburg Dormer (n = 144)and SA Mutton Merino (n = 166) flocks during the 1977 and 1978 lambing seasons as well as that of their female relatives were used to study…
Reasons for low productivity of sheep grazing barrel medic (Medicago truncatula) were investigated based on studies of intake and digestion. Pasture analysis showed that barrel medic represented only 13 to 30% of the diet selected and this was similar to…
A balance study was carried out to investigate digestibility and retention of major nutrients in wethers fed rations in which condensed beet molasses solubles (CBS) formed 27% of the dietary DM. Results showed that CBS contained 8,3 MJ of ME…
