The growth and efficiency of feed utilization of Simmentaler steers were studied on three dietary energy concentrations and three feeding levels. Energy concentration was varied through concentrate : roughage ratios, 80:20, 50:50 and 20:80, respectively, while the feeding levels were…
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…
Protein nutrition of underfed beef cows suckling two calves was studied during early lactation using Hereford x British Friesian cows. Feeding the cows with white fish-meal in each of the three years produced calves with a high growth rate (0,97…
The effect of monensin on the efficiency of feed conversion, carcass traits and the occurrence of coccidiosis in lambs. Twenty crossbred lambs, approximately one-month old, were allotted to two treatments according to body mass and sex. One group received monensin…
The effect of monensin on carcass and wool traits of Merino lambs. Forty Merino lambs were used to determine the effect of monensin (20 mg/day) on carcass and wool traits when fed at two energy levels. Monensin improved feed efficiency…
Supplementation on summer veld for the finishing of old ewes. Six groups of old Dohne merino-type ewes in poor condition were used in a trial at the ARI, Potchefstroom and were allotted to one of the following treatments: (i) Slaughtered…
A comparison between maize and grain sorghum as a concentrate source in fattening diets for beef cattle. The influence of replacing 0%, 50% and 100% of the maize meal (Pioneer 432) with bird resistant (SSK52) and non-bird resistant (NK 283)…
One hundred and twenty 4-month·old, single-combed, brown Hy-Line pullets were fed two isocaloric diets containing 16 or 13,5% protein with and without 5% clinoptilolite in four treatments with thirty hens per replicate. Sterile river sand was used as a filler…
An evaluation of soy-beans as a supplement for the wintering of woolled sheep on sour veld. The value of soy-beans as a supplement for woolled sheep on winter veld was investigated in the south-eastern Transvaal Highveld. Döhne merino ewes were…
Two veld types of the Gordonia district, namely Orange River broken veld and Kalahari sand veld, were evaluated in terms of chemical composition, feed intake and body mass change of grazing sheep. Adult wethers and non-reproducing ewes equipped with oesophageal…
A method of estimating the exogenous contribution to the duodenal amino acid supply in ruminants, based upon in vitro fermentation, is proposed. Analyses of five grass varieties, maize and maize/grass mixtures by the proposed method, reveals that in all cases…
Karakul x Romanov crosses with varying genetic contributions from each breed were evaluated for their pelt production and fertility. The genetic contribution of each breed varied from 12,5 - 87,5%. Pelt quality improved as the genetic contribution of the Karakul…
The seasonal changes in libido and peripheral venous plasma concentrations of testosterone and luteinizing hormone of the Angora ram were investigated. A definite breeding season from March to the end of July was determined. Libido, as well as the levels…
An experiment was designed to test the effectiveness of deep-frozen Angora goat semen after insemination. Oestrous periods of Angora goat does were synchronized with the progesterone sponge technique and the does were inseminated with pelleted deep-frozen semen at oestrus. Two…
The suitability of trichloroacetic acid as a protein precipitant for the determination of 'true protein' in feed samples was investigated. The TCA method compared well with the cupric hydroxide method recommended by the Association of Official Agricultural Chemists.
Phenotypic statistics of production traits of Angora goats. Measurements of 625 unselected 2-tooth Angora goat ewes in a commercial flock were analysed. The mean and standard deviation of body mass were 22,1 and 2,91 kg and of grease fleece mass…
The objectives of the study were to estimate genetic parameters for tick resistance and to evaluate the effect of the level of tick infestation on the estimates of genetic parameters for South African Bonsmara cattle. Field data of repeated tick…
Straw is a major by-product of the grain industry. Indirect ammoniation by urea to improve the nutritive value of straw was investigated. Ammoniated and untreated wheat straw were compared in a 2 x 2 factorial experiment at CP levels of…
Thirteen feed ingredients, representative of those used in the feeding of poultry and pigs in South Africa, were assayed for apparent and true metabolizable energy content (AME and TME), with at least 60 determinations being made on each ingredient. The…
