Concentrations of progesterone and luteinizing hormone were determined in peripheral blood plasma during the oestrus cycle of three non-lactating Afrikaner cows. Blood samples were drawn daily during the luteal phase (Day 3-16) and every 8 hours from Day l7 to…
Progesterone and total unconjugated oestrogen concentrations in the peripheral blood of 4 Afrikaner cows during late gestation and parturition were determined by RIA. From l2-18 days prepartum, progerone levels ranged .from 8.4 to 13,0 ng/ml and subsequently declined to 3,7-8,2…
Following parturition blood samples were collected daily from 5 mature lactating cows until the first post partum oestrous period. Plasma progesterone concentration as determined by RIA was applied to evaluate post partum ovarian activity. Parturition to first oestrus varied from…
In a five-year study made on beef cows ranched in the Fish River valley of the Eastern Cape with bulls being run continuously with the cows, an average calving percentage of 80,3 was achieved. Yearly calving percentages were positively correlated…
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 study was conducted firstly to establish the influence of cultivar and environment on the protein-, amino acid and ether extractable oil concentration of sunflower seed and secondly to study the influence of soil pH and fertilization on the protein…
Records kept over a 4-year period on a 300-sow Natal north coast farm show that reproductive efficiency in pigs is markedly depressed during the hottest months of the year. Under these conditions mean monthly temperatures in excess of 22 C…
The conception rates of 495 lactating cows and 99 replacement heifers were compared over a 3-year period on an extensive cattle ranch in the sour mixed bushveld. A summer breeding season and controlled selective grazing were applied. A protein-rich dicalciumphosphate…
Pedigrees of 2 291 lambs born during l97l and 1972 were employed in an estimation of the inbreeding coefficient of the S.A. Mutton Merino breed. Pedigrees were extended in 4 lines from the grand parents up to and inclusive of…
The substitution of whole maize grain for maize meal in high concentrate rations (±20% silage on dry basis) for young beef cattle did not significantly lower intake, digestible energy content of ration, mass gain and feed efficiency (2-5%). The milling…
Weaned Simmentaler steers were fed one of three basic rations viz. (l) silage ad lib.,(2) silage ad lib. + maize meal at l% of live mass and (3) 4 kg silage + maize meal ad lid. In addition each of…
4 Levels (0%, 4%, 8%, and 12% on a dry matter basis) of dried cage layer manure (DPW) were combined with either urea or sunflower oilcake meal to investigate the possibility of successfully including low levels.of DPW into cattle fattening…
