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Browsing Veterinary Science by UP Author "Du Plessis, Lizette"
Now showing items 1-20 of 23
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Du Plessis, Lizette; Soley, John Thomson (Elsevier, 2012-04)Abaxial tail implantation is a defect occurring in the neck region of spermatozoa and is characterized by misalignment of the centriolar complex relative to the head base. This defect has been described in a number of ...
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Pfitzer, Silke; Boustead, Keagan John; Vorster, Jan H.; Du Plessis, Lizette; La Grange, Louis J. (AOSIS Open Journals, 2019-11)Adenoviral infections may cause mild to severe morbidity or fatality in a large array of animal species. In crocodilians, hatchlings under 5 months of age are usually affected. However, there is a paucity of information ...
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Du Plessis, Lizette (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2009-09)Due to logistical problems in obtaining sufficient blood samples from apparently healthy animals in the wild in order to establish normal haematological reference values, only limited information regarding the blood ...
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Annandale, C.H. (Cornelius Henry); Smuts, M.P. (Mario); Ebersohn, Karen; Du Plessis, Lizette; Venter, Estelle Hildegard; Stout, T.A.E. (Tom) (Elsevier, 2018-08)Lumpy skin disease is an economically important disease of cattle, caused by the lumpy skin disease virus (LSDV; Capripoxvirus). It has a variable clinical appearance but, in severely affected animals, is associated with ...
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Botha, Alma Ester; Schulman, M.L. (Martin); Birrell, John R.; Du Plessis, Lizette; Laver, Pete N.; Soley, John Thomson; Colenbrander, Ben; Bertschinger, H.J. (Hendrik Jan) (Wiley, 2022-08)The effects of the GnRH vaccine Improvac® on testicular and epididymal morphometrics, histology and spermatogenesis were measured in 19 young (15–20 months) colts randomly assigned to one control (saline, castration at 57 ...
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Du Plessis, Lizette; Soley, John Thomson (Elsevier, 2011-10)The accurate assessment of avian sperm abnormalities is hampered by a lack of descriptive data and by the confusing terminology currently in use. Critical appraisal of semen samples from the distal ductus deferens of the ...
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Kotzé, Retha C.M.; Muller, Nolan; Du Plessis, Lizette; Van der Horst, Gerhard (Elsevier, 2019-08)Sperm structure and ultrastructure of Hermetia illucens was determined by light microscopy and transmission electron microscopy. The main sperm components were similar as for other Dipteran subspecies, while the ultrastructure ...
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Du Plessis, Lizette; Soley, John Thomson (Elsevier, 2011-03)Little detailed information is currently available on the incidence and morphological characteristics of abnormal sperm in the emu (Dromaius novaehollandiae) and of ratites in general. This situation is further compounded ...
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Du Plessis, Lizette; Soley, John Thomson (Elsevier, 2014-01)A comprehensive morphologic description of emu sperm at the light microscopy level, an essential prerequisite for the routine evaluation of semen quality in this species, is not currently available. In this study, sperm ...
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Du Plessis, Lizette; Malecki, Irek; Bonato, Maud; Smith, Marna; Cloete, Schalk; Soley, John Thomson (Elsevier, 2014-11)Commercial ostrich farming is constrained by the absence of a formal animal recordingand evaluation scheme as well as by current farming practices. Artificial insemination mayhave an important role in overcoming these ...
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Crole, Martina Rachel; Du Plessis, Lizette; Soley, John Thomson (Wiley, 2015-05)The distribution of Herbst corpuscles in the oropharynx of the ostrich and emu has recently been documented. However, although the morphology of these mechanoreceptors is well known in neognathous birds, little structural ...
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Bester, Elizabeth G.; Kitshoff, Adriaan Mynhardt; Botha, W.J.; Van Wilpe, Erna; Du Plessis, Lizette; Williams, J.H. (June Heather) (Medpharm Publications, 2022)Nemaline myopathy - a clinically and genetically complex heterogenous group of disorders - is described uncommonly in humans and rarely in animals, and is characterised by progressive muscle weakness. The diagnosis is ...
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Du Plessis, Lizette; Soley, John Thomson (BioMed Central, 2013-05-26)BACKGROUND: A novel transient structure was observed in the spermatids of three ratite species using transmission electron microscopy. RESULTS: The structure first appeared at the circular manchette stage of sperm ...
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Muvhali, P.T.; Bonato, M.; Malecki, A.; Du Plessis, Lizette; Soley, John Thomson; Cloete, S.W.P. (Springer, 2020-09)The study evaluated the effect of time of the year in which changes in photoperiod occurs on ostrich semen characteristics and male libido. Semen was collected for 5 days before, on and 5 days after winter solstice (21 ...
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Kelly, Susyn Joan; Du Plessis, Lizette; Soley, John Thomson; Noble, Frazer; Wells, Hannah Carolyn; Kelly, Patrick John (BMC, 2021-02)OBJECTIVE: Small angle X-ray scattering (SAXS) analysis is a sensitive way of determining the ultrastructure of collagen in tissues. Little is known about how parameters measured by SAXS are afected by preservatives commonly ...
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Du Plessis, Lizette; Soley, John Thomson (Elsevier, 2014-05)Existing reports on sperm structure in the emu do not adequately illustrate or describe all the salient ultrastructural features necessary for a meaningful comparison of normal and abnormal sperm in this species. As sperm ...
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Du Plessis, Lizette; Soley, John Thomson (Elsevier, 2016-12)Head shaping in mammalian sperm is regulated by a number of factors including acrosome formation, nuclear condensation and the action of the microtubular manchette. A role has also been suggested for the attendant Sertoli ...
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Du Plessis, Lizette; Bonato, M.; Durandt, Chrisna; Cloete, S.W.P.; Soley, John Thomson (CSIRO Publishing, 2019)Sperm macrocephaly syndrome (SMS) is characterised by a high percentage of spermatozoa with enlarged heads and multiple tails, and is related to infertility. Although this multiple sperm defect has been described in other ...
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Roopnarine, Narindra H.; Gupta, Sunil K.; Du Plessis, Lizette; Aire, Tom A. (Wiley, 2020-11)It remains a major concern that sperm structure has continued to be poorly investigated and reported in avian species. To our knowledge, sperm structure in the order Pelecaniforme has not been reported. Although McFarlane ...
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Roopnarine, Narindra H.; Gupta, Sunil K.; Du Plessis, Lizette; Aire, Tom A. (Elsevier, 2021-02)Avian species comprise more than half of all vertebrates yet there is a dearth of information regarding spermatid development in this class of animals. This report of spermiogenesis in the cattle egret, Bubulcus ibis, is ...
Now showing items 1-20 of 23