"Experientia docet" - Experience is the best teacher
Die benutting van Cynodon aethiopicus Clayton et Harlan (stergras) en Pennisetum clandestinum Hochst ex chiov (kikuyu) as hooig
Digestibility trials were conducted to determine the nutritional value of Cynodon aethiopicus Clayton et Harlan (stargrass) and Pennisetum clandestinum Hochst ex Chiov (kikuyu) as hay for sheep. Eragrostis curvula hays of 2 qualities were included as controls in the evaluation…
Stepwise adaptation of sheep fed ad libitum to a high concentrate diet and its effect on ruminal pH and lactic acid concentrati
A stepwise adaptation experiment was performed on 5 adult sheep fed ad libitum on successive diets containing 10; 26,5; 43,5; 54 to a final diet containing 65% maize meal and molasses for ll9 days. All diets contained a mixed buffer…
Ruproteïenbehoeftes van agtien-maand-oud osse gedurende die afrondingsperiode
Eighteen month old Simmentaler steers with an initial body mass of 310 kg were divided into 8 comparable groups of l0 animals each. The performance of steers at crude protein levels of 9,1, 11,9 and 14,7% in a maize silage…
Practical implications of the effect of drying and treatment on nitrogen content and in vitro digestibility of samples collected
Oesophageally fistulated (OF) sheep and cattle were used to collect samples from 7 green herbages used in digestibility trials. These samples were treated and dried in different ways. In the case of sheep the treatment of OF-collected samples (total extrusa…
The influence of dietary energy on a mathematical model for growth, body composition and feed utilization of pigs
A mathematical model together with data analyses were adapted to describe the effect of variation in dietary energy concentration, achieved by the inclusion of different levels of sawdust, on the growing pig. It was found that the autoregression coefficient of…
Endogenous energy, a cause of biased true metabolisable energy values
Generally fasted birds are used for estimating endogenous energy (EE) excretion, this measurement being a critical factor in determining the TME of feeds and ingredients. Evidence is presented that EE is overestimated because the fasted birds lack energy during the…
Retention of trace elements in the livers of sheep fed poultry manure as a ration component
Dried poultry manure from batteries ( DPM) was included at 0,0, 11,6, 23,5 and 35,4% in sheep finishing rations. An increase in the DPM content of rations caused substantial increase in the concentrations of calcium (Ca), phosphorus (P), sulphur (S),…
Ware metaboliseerbare energiewaardes met stikstofkorreksies om additiwiteit by pluimveediëte te verbeter
When least-cost diets, based on metabolizable energy (ME) values are formulated one assumes that the ME values allocated are additive, so that the sum of the individual ME values will represent the ME value of the diet. An experiment was…
Silage fermentation attributes and certain rumen parameters in sheep fed two grass silages harvested at different stages of matu
The aim of this study was to compare two tropical grass species, Panicum maximum and Digitaria eriantha, in terms of silage fermentation attributes and certain rumen fermentation characteristics of silage made either at the boot or full bloom stages of…
Influence of grass species and stage of maturity at ensiling on intake and partial digestibility by sheep
The aim of this study was to compare intake and partial digestibility of organic matter (OM) and nitrogen (N) of two ensiled tropical grass species, P. maximum and D. eriantha, made either at the boot or full bloom stage of…
Influence of species/cultivar and season on the quality of Atriplex grown at different sites in South Africa
Atriplex species/cultivars [Atriplex nummularia, A. canescens (Santa Rita) and A. canescens (Field Reserve 1)] were compared in terms of chemical composition and in vitro digestibility. The plant material was sampled at different seasons (autumn and winter) and from different sites…
The effect of breed on the survivability and motility rate of cryopreserved cock semen
This study evaluated the effect of breed on the survivability and motility rate of cryopreserved cock semen. Semen from three cock breeds; White Leghorn (WL), Ovambo (OV) and Potchefstroom Koekoek (PK) was collected by means of the abdominal massage technique…
Influence of body weight, age and management system on reproduction of South African Angora goat does
The effect of doe age, body weight and different management systems, as practiced in various Angora goat studs, on reproductive performance of does was investigated. The data used were collected from 2000 to 2004 on 12 Angora goat studs kept…
Factors affecting pre-weaning kid mortality in South African Angora goats
The data used for this study were collected in 12 different Angora goat studs from 2000 to 2004. Data collected on 17534 kids born alive in the different studs were included in the analyses. Average pre-weaning mortality rate was 11.5%…
The effect of embryo donor age and parity on the superovulatory response in Boer goat does
This study was conducted to evaluate the effect of the age and parity of the embryo donor on the superovulatory response and embryo recovery rate in Boer goat does. The oestrous cycles of seven maiden does (young, 1 - 2…
