Browsing Research Articles (Medical Bioscience) by Author "van der Horst, Gerhard"
Now showing items 1-6 of 6
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Accurate automated quantitative imaging of tortoise erythrocytes using the NIS image analysis system
Walton, S.; Hofmeyr, Margaretha D.; van der Horst, Gerhard (Taylor & Francis, 2013)The standard method for assessing blood cell characteristics using an ocular micrometer is time-consuming and limited. We used the Nikon NIS Elements imaging software and May-Grünwald-Giemsa staining to determine whether ... -
CASA in invertebrates
van der Horst, Gerhard; Bennett, Monique; Bishop, John D. D. (CSIRO Publishing, 2018)Sperm movement has been described in several phyla of invertebrates. Yet, sperm motility has only been quantified using computer-aided sperm analysis (CASA-Mot) in externally fertilising species (broadcast spawners) of ... -
Effects of GnRH vaccination in wild and captive African Elephant bulls (Loxodonta africana) on reproductive organs and semen quality
Lueders, Imke; Young, Debbie; Maree, Liana; van der Horst, Gerhard; Luther, Ilse (Public Library of Science, 2017)OBJECTIVES: Although the African elephant (Loxodonta africana) is classified as endangered by the International Union for Conservation of Nature (IUCN), in some isolated habitats in southern Africa, contraception is of ... -
Morphometric and structural analysis of Florida manateespermatozoa
Cowart, Jonathan R.; Collins, Danielle M.; van der Horst, Gerhard (Wiley, 2022)Sperm characteristics, such as sperm morphology and sperm morphometry areimportant in assessing sperm quality. This is especially important for the man-agement and conservation of endangered and exotic species, like the ... -
Quantification and identification of sperm subpopulations using computer-aided sperm analysis and species-specific cut-off values for swimming speed
Maree, Liana; van der Horst, Gerhard (Taylor & Francis, 2013)Motility is an essential characteristic of all fl agellated spermatozoa and assessment of this parameter is one criterion for most semen or sperm evaluations. Computer-aided sperm analysis (CASA) can be used to measure ... -
Quantitative sperm characteristics of Tankwa goats with special reference to hyperactivated motility
Ngcauzele, Asanele; van der Horst, Gerhard; Kotze, A (South African Society for Animal Science, 2020)Computer-assisted semen analysis (CASA) is an automated and objective method of evaluating structural (e.g. morphology) and functional sperm parameters (e.g. motility and hyperactivation). Sperm hyperactivation is essential ...