A trial was conducted to investigate the response of broilers to changing levels of calcium and non-phytate phosphorus. A total of 1344 chicks were allocated to 96 cages in a controlled-environment house. Limestone and phosphoric acid were added to a…
This study was conducted to appraise the effects on egg quality and production performance of laying hens when drinking water was supplemented with calcium (Ca) and magnesium (Mg). A total of 384 (64-week-old) Hy-line Brown laying hens were assigned at…
The objective of this study was to determine the effects of low tannin sorghum as a maize replacement on the performance and bone morphometrics of Ross 308 broiler chickens. A total of 250 one-day-old broiler chickens were allotted to a…
Sorghum (Sorghum bicolor (L.) Moench) is the fifth most important grain crop after wheat, rice, maize and barley. It is cultivated for food and feed in America, Asia, Australia and Africa. Newly developed sorghum varieties should be evaluated for their…
Earlier studies on breeding birds indicated no effect of dietary energy-content on feed intake. This observation is contradictory to results for other animals and/or poultry where feed intake decreases with an increase in dietary energy level. Literature revealed that a…
The aim of this study was to determine the effect of region (Qua-Qua, Maria Moroka, Sandveld and Tussen die Riviere) and gender on carcass characteristics and chemical composition of meat from the red hartebeest. The parameters measured on 29 red…
The last 20 years of research in South Africa on feeding standards is reviewed. A major contribution to quantitating energy requirements for growth has been the advent of growth-curve analysis which enable accurate pattern description of genotype and dietary responses.…
The true diagnosis of mineral deficiencies depends on the mineral responses to the supplementation of the deficient minerals; however, based on animal tissue analysis Cu, Mn, Ca and P are minerals that are likely to be deficient in cattle production…
Supplementation of low quality Mongolian hay and barley straw with urea, minerals and a small quantity (11 - 14% of total DM) of easily digestible carbohydrate had a positive influence on in vivo digestibility, increasing the net energy value of…
Available information on the selenium (Se) status of grazing herbivores in South Africa is reviewed and collated in the form of a geographical distribution map. Marginal to acute Se deficiencies have been reported to occur in the Midlands region and…
The aim of this study was to quantify the suitability of Boscia foetida as a fodder source for goats. Samples of leaves and twigs were taken in the Northern Cape and Limpopo provinces of South Africa. The concentrations of Ca,…
The objective of this study was to quantify the macro and trace mineral concentrations of Atriplex canescens, A. halimus, A. nummalaria and Cassia sturtii at two different sites in South Africa. Statistically significant differences in Ca, P, Mg, Se, Zn…
The study was conducted to determine mineral concentrations in diets selected by goats grazing a thorn shrubland in a semi-arid region of north Mexico. Three goats (38 ± 1.8 kg BW) fitted with oesophageal cannulae were used to collect monthly…
Samples of kikuyu foggage (standing hay) were collected in northern KwaZulu-Natal from five adjoining paddocks to measure the changes in nutrient composition of the foggage as winter progressed. Leaves and stems were separated. The first samples collected on the 18th…
