Fourteen Holstein calves, two to four days of age, were randomly divided into two groups to determine the effect of abomasal curd suppression on selected blood profiles. Calves received a milk replacer in which casein coagulation either was normal (CM),…
Production differences between Merino ewes from different regions and between their progeny as determined at a central testing centre. The first Merino championships for measured production took place in 1984. A total of 31 breeders each sent 12 ewes which…
The effect of lupin supplementation during mating on the reproduction of autumn-lambing Merino ewes was studied relative to an unsupplemented control group. A total of 158 ewes were available for lambing in 1985, 229 in 1987 and 185 in 1988…
True metabolizable energy, corrected for nitrogen retention (TMEN) and true lysine availability, was determined for maize and sunflower oilcake meal, two samples of each, and in samples of fishmeal, soyabean oilcake meal and sorghum meal using intact and caecectomized roosters…
Influence of copper and selenium supplementation in SA Mutton Merino ewes, kept on pastures with low copper and selenium concentrations, was investigated. Ewes which came into oestrus and conceived during March to April, were found to have concentrations of plasma…
The objectives of this study were to evaluate the primal cut composition of South African lamb carcasses with different fat scores, and to identify cuts suitable for fat trimming. Sixty grain fed Dorper lambs (rams and ewes) were divided into…
This study was conducted to evaluate the effect of different rumen fermentation modifiers (ionophores) in feedlot finisher diets on the production performance of S.A. Mutton Merino lambs. Monensin (16.4 mg/kg), lasalocid (33.0 mg/kg) or salinomycin (17.5 mg/kg) was incorporated into…
Mature weight breeding values were estimated using a multi-trait animal model (MM) and a random regression animal model (RRM). Data consisted of 82 064 weight records from 8 145 animals, recorded from birth to eight years of age. Weights at…
Rumen fluid collected from three rumen fistulated N’Dama and three crossbred animals fed three different diets at medium supplementation level, was used to compare the plant cell wall degrading community of the two breeds of cattle. In vivo digestibility was…
Data obtained from a pair-mated ostrich flock located at Oudtshoorn, South Africa, were used to estimate genetic parameters for egg weight (EWT), weight of day-old chicks (CWT), water loss to 21 (WL21) and 35 (WL35) days of incubation, and pipping…
The utilization of non-linear threshold models and linear animal models to estimate variance components for categorical reproductive traits in beef cattle was investigated. Three traits, retention (RET), stayability (STAY) and calf tempo (CT) were defined. The data set consisted of…
Levels of sheep and goat production, as well as aspects of the distribution of ownership of pigs and poultry, in three livestock-producing areas of Ciskei are discussed. Findings show low levels of production and reproduction and high mortality rates in…
The effect of treatment on the chemical composition and in vitro organic matter digestibility (IVOMD) of wheat, oat and barley straw and oat hay at 25 °C was investigated in a 4x3x2x5 factorial experiment. Apart from the four roughages, urea…
Urea ammoniation of wheat, oat and barley straw and oat hay. 2. Utilization by sheep. Wheat, oat and barley straw, as well as oat hay were ammoniated, using 55 g urea and 400 g moisture kg·1 roughage for a treatment…
Effect of prolonged treatment of wheat straw with urea or a urea/caustic soda combination during baling on the nutritional value thereof for sheep. A study was undertaken to investigate the treatment of wheat straw with urea or urea plus caustic…
Supplementary salt (NaCI) and crude protein (CP) were provided to young Merino wethers grazing native pasture. Twenty-eight wethers were divided into 7 groups and given the following supplements daily via rumen cannulae: 0, 5 (Control), 15 and 30 g NaCl;…
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)…
While grazing native pasture, seven groups of 4 young Merino wethers received the following supplements daily via rumen cannulae: 0, 5 (Control), 15 and 30 g salt (NaCl); and 5, 15 and 30 g NaCl + 20 g crude protein…
In one experiment the effects of casein in the abomasum was compared to isonitrogenous quantities of casein or urea in the rumen. In another two experiments the effects of casein in the rumen or abomasum were compared to isocaloric quantities…
Relationship between performance measurements and auction prices of Veld Merino rams. Merino rams for veld ram clubs are received at the age of six months and then raised on natural grazing. At the age of one year, with…
