Browsing Doctoral Degrees (Animal and Poultry Science) by Issue Date
Now showing items 1-20 of 51
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Estimation of carcass composition of beef cattle by the urea dilution technique.
(1977)No abstract available. -
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 ... -
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 ... -
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 ... -
The photoperiodic response of male broiler breeders.
(2010)The expression of photorefractoriness, a feature of seasonal breeding in birds, is important in production species, where egg production and fertility are affected by the photoperiod. Years of selection in meat-type birds ... -
Characterisation of indigenous Zulu (Nguni) sheep for utilisation improvement and conservation.
(2010)The Nguni sheep of Zululand, South Africa, are called the Zulu sheep. They are a source of food and cash for the rural farmers of KwaZulu-Natal. There is insufficient information available about the characteristics of this ... -
Improving the nutritional representation of horse feeds in South Africa.
(2011)Protein has been identified as a major reason that people purchase a horse feed, with anecdotal explanations offered for the poor prediction of response of horses to their rations, particularly in the sport horse market. ... -
The effect of nitrogen fertilization and stage of re-growth on the nutrititive value of kikuyu in the Midlands of KwaZulu-Natal.
(2011)Kikuyu pasture was fertilized at low and high levels of nitrogen (N), namely 50 and 200 kg N/ha, after mowing and clearing the plots, to induce low and high levels of N in the herbage. The subsequent growth was harvested ... -
The fibrolytic potential of domestic and wild herbivores microbial ecosystems on maize stover.
(2012)The growing demand for meat worldwide by the increasing human population (6.8 billion) calls for an increase in livestock production as well as attention to environmental sustainability. Production increases are critical ... -
Mechanisms of resistance to Rhipicephalus ticks in Nguni cattle reared in the semiarid areas of South Africa.
(2013)Ticks and tick borne-diseases (TBD) are major challenges to cattle production among smallholder farmers in the semiarid areas of South Africa. Nguni cattle have been reported to be resistant to ticks and TBD, however, the ... -
Feeding behaviour, diet selection of goats and nutritive value of browse species in sub-humid subtropical savannah, South Africa.
(2012)Diet selection and its variation due to difference in forages nutritive value are central processes in plant-herbivore interactions. An incorporating of these parameters may allow predicting diet selection patterns which ... -
Integrated control of gastrointestinal nematodes of sheep using plant extracts. and bicontrol agents.
(2013)Infection of small ruminants by gastrointestinal nematodes (GIN) is a major health concern because they cause substantial economic losses, especially in the tropics and sub-tropics. For many years, control of GIN has been ... -
Relationship between linear type traits and fertility in Nguni cows.
(2014)The broad objective of the study was to determine the relationship between linear type traits and fertility in Nguni cow herds. Data collected from 300 Nguni cattle owning households from two municipalities (150 each) were ... -
Effects of hydric stress on the growth, blood chemistry and meat quality characteristics of indigenous chickens.
(2013)The broad objective of the study was to determine the effects of restricted water intake on the growth, blood chemistry and meat quality characteristics of indigenous chickens in semi arid environments. A total of 15 flocks ... -
Effects of physicochemical properties of fibrous feed on feeding behaviour and gut health of growing and finishing pigs.
(2013)The broad objective of the study was to determine feeding behaviour and gut health of pigs fed different fibres at varying inclusion levels. Maize cob, maize stover, sunflower hulls, veld grass, sawdust, lucerne and dried ... -
The productive response of broiler breeder hens to lighting and growth manipulation during rearing.
(2003)This study was designed to provide information that would enable the development of a theory to predict age at sexual maturation and settable egg production in broiler breeder hens submitted to a variety of constant or ... -
A stochastic model to predict annual egg production of a flock of laying hens.
(2004)Ovulation rate in laying hens is determined by the interaction of two biological systems; namely, a circadian rhythm that restricts the release of luteinising hormone to an eight- to ten-hour period of the day, and the ...