Browsing Doctoral Degrees (Animal and Poultry Science) by Issue Date
Now showing items 1-20 of 51
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The influence of variations in the level of nutrition on reproduction in the ewe.
(1972)No abstract available. -
Estimation of carcass composition of beef cattle by the urea dilution technique.
(1977)No abstract available. -
Response of broiler chickens to dietary lysine, methionine and metabolisable energy concentrations.
(1981)No abstract available. -
Intensive beef production on cultivated pastures in a sub-tropical environment.
(1984)The comparative performance of spring-calving beef cowherds comprising either Dual Purpose (Simmentaler) or British-cross (Hereford x Africaner) cows and calves was investigated at stocking rates of 3,0, 4,12, 5,34 and ... -
The effect of stocking rate on the performance of beef cows and their progeny in the highland sourveld areas of Natal.
(1988)In three separate. but related studies, the performance of weaner/replacement heifers, dry pregnant cows, and first calvers and mature cows and their progeny, at different stocking rates in the Highland Sourveld, was ... -
Testing the libido of breeding sires to predict mating performance in the field and the hormonal control of male sexual behaviour.
(1988)The incidence of sexually low-response rams was determined in a group of 31 young Ile de France stud rams by means of three libido tests. Eight rams ( 25,8%) we reclassified as being sexually low-response. The proportion ... -
The effect of form of nitrogen on the efficiency of protein synthesis by rumen bacteria in continuous culture.
(1991)The aim of this study was to examine the effect of the form of nitrogen available to mixed rumen bacteria on the efficiency of microbial protein synthesis. A novel, solid substrate, continuous culture fermentor which ... -
Theoretical and applied aspects of voluntary feed intake by ruminants, with special reference to the kinetics of rumen digestion.
(1994)The aim of these studies was to examine the factors which determine voluntary feed intake and feed quality in ruminants. In the first experiments, the concepts of ruminal digestion kinetics were conceptualised and measured ... -
The potential of pods from tree legumes as supplement to low quality roughages for ruminants.
(2002)The goal of the study was to examine the use of pods from tree legumes as supplements to poor quality roughage-based diets. Trials were carried out to address issues related to the nutrient content of the pods and their ... -
Productivity of South African indigenous Nguni goats possessing Synergistes jonesii bacteria on Leucaena Leucocephala-grass and natural pastures.
(2002)The main objectives of the study reported in this thesis were to investigate the cause of poor conception and high pre-weaning kid mortality rates among South African indigenous Nguni goats (SAING) maintained on Leucaena ... -
The influence of energy density on the performance of feedlot cattle.
(2002)This study examined the interaction of diets differing in their energy densities and heat increments of feeding on the feed intake patterns, physiological measurements, empty body composition, and animal performance of ... -
Modelling nutrient responses and performance of broiler breeders after sexual maturity.
(2007)With the worldwide increase in consumption of poultry meat in recent years, the production of hatchable eggs from broiler breeding stock has become a critically important component of the poultry industry. Surprisingly, a ... -
Nutritive value and manure quality in supplemented maize stover and grass hay diets for ruminants.
(2007)Production of ruminants is highly dependent on utilization of roughages. In tropical regions, particularly Sub-Saharan Africa, the roughages are predominantly of poor quality due to high fibre and low protein content. ... -
Photic involvement in the reproductive physiology of female domestic fowl.
(2008)No abstract available. -
Modelling broiler populations for purposes of optimisation.
(2008)With the narrow margin of profit in the broiler enterprise, how can producers increase profit potential? It is not an easy task to answer this question since the net financial return depends on many factors; some are related ... -
A dynamic mechanistic anaylsis of the thermal interaction between a broiler chicken and its surrounding environment.
(2010)Chickens, being open thermodynamic systems, maintain a constant exchange of energy and matter with their surrounding environment. In order to avoid reaching thermodynamic equilibrium with the environment the bird makes ...