Doctoral Degrees (Animal Sciences)
Recent Submissions
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Comparing feed use efficiency and enteric gas production of Holstein and Jersey cows in a kikuyu pasture-based system using mathematical models
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: Feed use efficiency to synthesise maximum amounts of milk while ensuring responsible use and protection of the environment is of significance for sustainable milk production. The aim of this study was to ... -
Modelling the growth, feed intake and backfat deposition of different South African sheep breed types
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: In order to set up a decision support system which can be applied to the feedlot finishing of lambs, models relating to the growth and production of lambs need to be developed. This dissertation presents ... -
Modulation of starch digestion for productive performance in dairy cows
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: In this thesis, a series of experiments were conducted to ultimately investigate the effects of modulating site of starch digestion by varying ruminal fermentability of various starch sources on feed ... -
Development of a cost-effective system for ovoviviparous production of Artemia nauplii at low-salinity as live food for the larvae of the African catfish (Clarias gariepinus: Burchell, 1822)
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: The brine shrimp Artemiais a small crustacean used as live food in fish and shell fish culture. Among other live food types which are commonly used in aquaculture, Artemia is widely known and accepted ... -
Genetics of ovine resistance to gastrointestinal nematodes
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: This study consists of various papers on the genetic evaluation of sheep for resistance to gastrointestinal nematodes in South Africa using faecal worm egg count (FWEC) as a proxy. Outcomes from the study ... -
Immunocastration and its application in ram lambs
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: In South Africa, Dohne Merino sheep are farmed extensively for wool and meat production. Ram lambs are typically castrated to enable easier management of mixed-sex flocks by manipulating reproduction and ... -
Genomics as part of an integrated study of smallholder sheep farming systems in the Western Cape, South Africa
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: The aim of this study was to evaluate the productivity of smallholder sheep farming systems in the Western Cape, South Africa, using an interdisciplinary approach, combining socio-economic factors and ... -
The effects of supplementing alternative carbohydrate sources on production and fibre degradation of jersey cows grazing pasture.
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Problems identified in the pasture-based dairy systems of the southern Cape of South Africa include lowered milk production during summer months, low milk solids during winter months, unsynchronised timing ... -
The effect of maize vitreousness and a starch binder on in vitro fermentation parameters and starch digestibility in dairy cows
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Maize kernels consist of hard vitreous endosperm and soft floury endosperm, and the ratio of the vitreous to floury endosperm determines the vitreousness of the kernel. As ruminal fermentation and animal ... -
Effects of energy sources on milk production and reproduction of dairy cows
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Two main objectives were investigated in this study, conducted at the Elsenburg Research Farm of the Western Cape Department of Agriculture (WCDA). The first objective was to study the effect of nutritional ... -
Comparative assessment of the production performances of different strains of nile tilapia and the evaluation of genotype × environment interaction
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Aquaculture is acknowledged worldwide as a major contributor to food security. Nile tilapia (Oreochromis niloticus) is the second most produced freshwater fish, and an important source of affordable animal ... -
A genome-wide association study on mechanisms underlying genetic resistance to gastrointestinal parasites in goats, Zimbabwe
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Genome wide association studies (GWAS) have evolved into powerful tools for investigating the genetic association of complex traits, such as gastrointestinal parasite (GIN) resistance. Knowledge on genes ... -
Copy number variations in South African Nguni cattle : prevalence, characterization and genetic diversity
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: Copy Number Variations (CNVs) comprise of deletions, duplications and insertions larger than 1kb that occur within genomes. The identification of CNVs within regions of the bovine genome important ... -
Effect of Pawpaw (Carica papaya) seed meal on the reproductive, endocrine and immune system of Mozambique tilapia (Oreochromis mossambicus)
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Aquaculture, the farming of aquatic animals and plants, has the potential to solve the problems of dwindling catches from artisanal fisheries as a result of overfishing and habitat degradation. Tilapia ... -
A protocol for liquid storage and cryopreservation of ostrich (Struthio camelus) semen
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: The aim of this study was to develop a species-specific protocol for short (liquid) and long (cryopreserved) term storage of ostrich semen. Effective storage followed by artificial insemination (AI) could ... -
Application of dietary bentonite clay as feed addictive on feed quality, water quality and production performance of African catfish (Clarias gariepinus)
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Aquaculture remains the fastest growing animal food producing sector and is gradually overtaking capture fisheries as a source of food fish. The challenges of poor feed quality, feed utilisation and water ... -
Genetic evaluation of functional longevity in South African Holstein cattle using a proportional hazards model
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: Improvement and selection of superior animals for longevity is a viable complimentary strategy for increasing functional longevity of Holstein dairy cattle. Genetic evaluation of animals for functional ... -
Comparing the effects of tranquilisation with long-acting neuroleptics on blue wildebeest (Connochaetes taurinus) behaviour and physiology
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: In South Africa, large numbers of game animals are translocated annually. These animals are subjected to a great amount of stress and the use of long-acting neuroleptics (LANs) has become a common practice ... -
Exploring genetic architecture of tick resistance in South African Nguni cattle
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: The broad objective of this study was to identify single nucleotide polymorphisms (SNP) markers associated with tick resistance in South African Nguni cattle and it was addressed by three specific objectives. ... -
The effects of ocean acidification and temperature change on the West Coast rock lobster (Jasus lalandii)
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: The West Coast rock lobster (WCRL), Jasus lalandii, is a critical marine fisheries resource for South Africa and may in future be negatively affected by the changes in seawater parameters associated with ...
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