The performance in terms of bodymass and reproduction of two groups of free-grazing Dorper ewes, with (+ P) and without (- P) phosphorus (P) supplementation, was investigated over 4,5 years at Armoedsvlakte (notorious for its P-deficient soils) to establish whether…
The effects of supplementary P (phosphorus) on the performance of cattle at two distinctly different experimental sites: one notorious for its P-deficient pastures (Armoedsvlakte), the other (Glen) suspected of being deficient in P, were compared over 5,5 years. The acuteness…
Rib bone samples were taken from free-grazing, crossbred, beef-type cows at different stages of their reproductive cycles to monitor the P status of supplemented and unsupplemented groups. Two experimental sites, Glen and Armoedsvlakte were used, the latter notorious for its…
Blood plasma and faecal grab samples were evaluated as indicators of P status of cattle grazing at two experimental sites (Glen and Armoedsvlakte). Plasma Pi levels clearly identified the - P cattle at Armoedsvlakte as being P deficient whilst at…
One hundred pigs were slaughtered sequentially to characterize and quantify protein deposition in two types (lean and obese) and sexes (boars and gilts) of Landrace pigs. The pigs were fed ad lib on a diet containing 18% protein, 1% lysine…
Protein deposition rate was measured in 100 lean and obese pigs of both sexes (boars and gilts) fed ad lib. The intakes of digestible ideal protein (DIP) and deposition rates of body protein was used to calculate conversion ratios of…
The relationship between body measurements and growth test results of Simmentaler bulls. The relationship between body measurements and performance of 664 Simmentaler bulls was investigated. Phase C data from three departmental performance testing stations, namely Irene, Vryburg and Cedara, were…
Factors affecting reproduction in Merino ewes were investigated using data of 7 917 matings of 2 258 ewes in the Tygerhoek flock during the lambing seasons of 1971 to 1984. The ewes were run in a selection trial to evaluate…
Different diets low in lysine were fed to ducklings of various ages in three separate trials to investigate the effect of these diets on bodymass and subsequent reproductive performance. The results showed that when ducklings were fed a diet containing…
Four rumen-cannulated steers were fed a diet consisting of whole maize grain, high protein concentrate and molasses. Two of the four animals received 10% ground Eragrostis curvula hay in addition to the whole maize grain diet. The feeding period was…
The effect of active immunization against androstenedione on reproductive performance was investigated in a flock of 151 Angora ewes. Although differences occurred between groups in some of the reproductive parameters recorded, the eventual number of kids produced was virtually the…
Correlation between parts of the Merino fleece and the subsequent influence on income. The fleeces of 160 one· year old ewes were classed and separated according to the standards of the National Wool Growers' Association into 'fleece wool', BKS…
The effect of inclusion rate of Eragrostis curvula hay and sunflower husks on milk production and milk composition of first-calf Friesland cows. The effect of different inclusion rates of Eragrostis curvula in complete diets on the milk production and milk…
Silkiness and elasticity as breeding aims in Karakul lambs. Descriptions of existing pelt characteristics for 1083 Karakul lambs were examined and general hair quality as well as the hair texture of the body and extremities was evaluated and grouped in…
A high density fish polyculture investigation was conducted during the summer season of 1984-1985 at the Umtata Dam Fish Research Centre, Transkei . Fish species used, included the cross-breed between the Israeli Dor 70 and the Aischgrund varieties of the…
The determination of a rate constant for the outflow of chromium-mordanted protein particles from the rumen of lactating dairy cattle. Lactating Friesian/Holstein cows were used for the determination of the outflow rate of protein particles from the rumen. Fishmeal was…
A trial was conducted to determine the efficacy of dietary molybdenum (Mo) and sulphur (S) in reducing liver copper (Cu) levels in sheep at risk of Cu toxicity. Sheep were fed 75 mg Cu/day during a preliminary period…
Fermentation characteristics and chemical composition of silage made from different ratios of cattle manure and maize residues were investigated. Manure (fresh) obtained from steers fed on a high concentrate diet was ensiled on a laboratory scale with maize…
Maize silage is relatively high in energy but low in protein for the normal lactational requirements of dairy cows. Three trials were conducted to compare the use of urea as opposed to natural protein supplements in balancing the…
