The influence of energy supplementation (2,8 kg maize meal) of beef cows during early lactation and of creep feeding their suckling calves was investigated in two areas (Thornveld and Transitional Highland Sourveld). The cows were bred in spring to calve…
The effect of dietary supplementation using 2,3 kg maize meal per day on change in body mass during early lactation and on the calving rate of first-calf Afrikander, Sussex and Hereford type cows which grazed the Tall Grassveld of Northern…
The mating ability of 541 Merino rams from 19 different producers in the area surrounding Bloemfontein was investigated. About 23 % of the rams were not able to mate successfully with a ewe in oestrus. This figure is a combination…
The repeatability of reproduction characteristics in the Tygerhoek Merino flock - preliminary observations. The repeatability of lambs born and weaned per mating was estimated using data from 145 ewes of a control group and 260 ewes of four selection groups…
A genetic control flock of Merino sheep consisting of 160 ewes and 16 rams, was established in 1969 at the Tygerhoek Experimental Farm near Riviersonderend in the South Western Districts of South Africa. In 1976 it was extended to 200…
The repeatability of the reproduction rate of commercial Merino ewes. The repeatability of the reproduction rate of 143 and 423 Merino ewes in two commercial flocks was investigated. Ewes from flocks were grouped as those that failed to lamb and…
The relative economic importance of quality traits in ostrich feathers. The prices obtained for 222 repeatedly evaluated single ostrich feathers and 498 feather-lots sold at 11 auction sales during 1978 and 1979, were used to determine the relative economic importance…
The partial replacement of full-fat soyabean meal in diets for early-weaned pigs with algae or sunflower oil cake meal. Three starter diets for early-weaned pigs, (weaned at an age of 21 days) were fed ad libitum for 26 days to…
The effect of temperature, moisture level and treatment period on the ammoniation of wheat straw by 75 9 urea per kg wheat straw was investigated in a 4 x 2 x 6 factorial experiment. Independent variables included temperatures of 4;…
The ammoniation of wheat straw by urea in a stack method was investigated and compared to urea supplemented and untreated straw in an intake and in vivo digestibility trial. Ammoniation and supplementation significantly (P ≤ 0,01) improved the mean daily…
A study of methods of analysis for sulphur amino acids in feeds was undertaken with a view to finding methods suitable for the routine analysis of feedstuffs. In the case of cyst(e)ine, it was found that the results obtained from…
A trial was conducted with 1 152 Amberlink laying pullets from the ages of 30 to 35 weeks to determine the tryptophan requirements. The eight treatments consisted of a series of diets made by dilution of a summit diet with…
Four male and 16 female eight-week old Pekin breeder ducks per pen were randomly allocated to nine deep-litter pens to compare the effects of qualitative (0,35% lysine) and quantitative (60% of a group fed ad lib) feed restriction during the…
Reproduction data of 839 Dormer and 741 SA Mutton Merino ewes were analysed in order to evaluate certain conventional selection criteria for reproduction rate in sheep. Results indicated that, although a positive response in reproduction rate can be expected for…
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…
Skin and wool samples of fully grown white-wool led rams of 10 different sheep breeds were investigated. An index was constructed according to which the breeds could be classified into three groups, taking 11 characteristics into…
Pregnant, adult Angora ewes, supplemented with either 0, 200, 400 or 600 9 of alkali-ionophore treated whole maize per ewe per day were kept on Atriplex nummularia pasture for the entire gestational period. Changes in live bodymass, reproductive…
The relationship between 18-month mating mass and average lifetime conceptions/mating (Ec/Em), lambs born/conception (Lb/Ec), lambs born/mating(Lb/Em), preweaning mortalities/Iamb born (Ld/Lb) and lambs weaned/mating (Lw/Em) was investigated with data from 1222 Merino ewes available for at least…
Correlations between eight wool characteristics as well as bodymass were calculated for the Dohne Merino. Data originated from 320 ewes present in the development project on this breed at the Agricultural Research Station, Dohne.
