Five models were studied for goodness of fit to in sacco organic matter disappearance. Except for the first-order model, all the other models showed an accurate and unbiased fit, although in some cases this was achieved by unrealistic parameter estimates…
Forty-five adult SA Mutton Merino ewes and 36 eight-month-old ram lambs were divided into three groups so that each group contained an equal number of animals of each haemoglobin type AA, AB and BB. Three diets were compiled…
Forty-five SA Mutton Merino ewes, 2 to 5 years of age, were divided into three groups. Although all ewes received the same basic diet, the diet of one group (group M) was supplemented with molybdenum and that of another group…
A simplified method, whereby tick resistance in cattle is assessed by counting all ticks under the tail and on the scrotum or udder only, was compared to the Australian method, where tick resistance is assessed by counting successful females on…
An experiment was conducted to (i) determine the effect of heat treatment and thermal ammoniation on dry-matter digestibility and true metabolizable energy content of high-tannin grain sorghum in a digestion trial with roosters and (ii) to determine the relative nutritive…
In a chick growth assay over a 10-day period, no significant difference could be established between the effects of DL methionine, methyl maleic methionine and the methyl hydroxyl analogue of methionine on growth rate and efficiency of feed conversion. However,…
Sixty-two piglets weaned at three weeks of age were allotted, in pairs, to four experimental diets (14 piglets to one diet and 16 piglets to each of the other three diets), and fed until 10 weeks of age. The diets…
The effect of alkaline hydrogen peroxide (AHP) treatment and urea supplementation on the feeding value of wheat straw was investigated in a 2 x 2 factorial experiment with sheep. Bales of wheat straw were dipped for a period of 24…
The effects of energy and crude protein (CP) supplementation to lactating ewes on the performance of the ewes and their lambs, while grazing native pasture (veld), were studied during two autumn (1981 and 1982) and two spring (1983 and 1984)…
The effects of energy and crude protein (CP) supplementation on feed intake of lactating ewes grazing native pasture (veld) were studied during two autumn (1981 and 1982) and two spring (1983 and 1984) lambing seasons. The CP content of the…
The effects of energy and crude protein (CP) supplementation on diurnal and seasonal variations in rumen pH and concentrations of ammonia (NH3) in lactating ewes grazing native pasture (veld) were studied during two autumn (1981 and 1982) and two spring…
The experiment was conducted to compare the mobile nylon bag technique (MNBT) with conventional digestibility techniques for the estimation of digestible energy (DE) in pig diets. Factors investigated were the effect of washing after retrieval, predigestion time, particle size, retention…
Two experiments were conducted to (i) determine the effect of thermal ammoniation (NH3BPS) and heat treatment (HBPS) of birdproof sorghum (BPS) on energy and N metabolism, measured with intact and ileo-rectal anastomosed pigs and (ii) to evaluate NH3BPS and untreated…
Five experiments were conducted to devise a feeding strategy to reduce fat deposition in broiler chickens. From these experiments it was determined that early feed restrictions, beginning at 7 days of age, decreased body fat, improved FCE, and had little…
