Browsing Veterinary Science by UP Author "Van Sittert, Sybrand J."

Browsing Veterinary Science by UP Author "Van Sittert, Sybrand J."

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  • Body surface area and thermoregulation in giraffes 
    Mitchell, Graham; Van Sittert, Sybrand J.; Roberts, D.G. (David); Mitchell, Duncan (Elsevier, 2017-10)
    One of several hypotheses for the evolution of the shape of giraffes is that it evolved to maximize heat loss via a high surface area to mass ratio. We calculated the surface area (SA) of the head, neck, trunk and upper ...
  • Demography of giraffe deaths in a drought 
    Mitchell, Graham; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Royal Society of South Africa, 2010-11)
    Darwin’s theory for the evolution of the long neck of giraffes is that height confers access to browse free of competition from smaller browsers. The theory predicts that survivors of a drought will be the tallest animals ...
  • The digestive morphophysiology of wild, free-living, giraffes 
    Mitchell, Gillian; Roberts, D.G.; Van Sittert, Sybrand J. (Elsevier, 2015-09)
    We have measured rumen-complex (rumen, reticulum, omasum, abomasum) and intestine (small and large combined) mass in 32 wild giraffes of both sexes with body masses ranging from 289 to 1441 kg, and parotid gland mass, ...
  • Growth patterns and masses of the heads and necks of male and female giraffes 
    Mitchell, Graham; Roberts, D.; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Wiley-Blackwell, 2013-05)
    We have analyzed the growth patterns of the head and neck of 65 male and 71 female giraffes from two different populations of giraffes, and also the dimensions of 19 different components of the head and neck in 8 female ...
  • Occurrence of African horse sickness in a domestic dog without apparent ingestion of horse meat 
    Van Sittert, Sybrand J.; Drew, Tessa M.; Kotze, Johann L.; Strydom, Tom; Weyer, Camilla Theresa; Guthrie, Alan John (OpenJournals Publishing, 2013-09-13)
    This is the first case of African horse sickness (AHS) in a dog where there was no apparent ingestion of horse meat. Significantly, the dog was part of a colony that resides in a Good Clinical Practice and Good Laboratory ...
  • On reconstructing Giraffa sivalensis, an extinct giraffid from the Siwalik Hills, India 
    Van Sittert, Sybrand J.; Mitchell, Graham (PeerJ, 2015-08)
    Giraffa sivalensis occurred during the Plio-Pleistocene period and probably represents the terminal species of the genus in Southern Asia. The holotype is an almost perfectly preserved cervical vertebra of disputed ...
  • Orbit orientation and eye morphometrics in giraffes (Giraffa camelopardalis) 
    Mitchell, Graham; Roberts, D.G.; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Zoological Society of Southern Africa, 2013-10)
    Giraffe are thought to have excellent vision.We measured eye size, orbit orientation and retina surface area in 27 giraffes of both sexes ranging in age from neonates to mature adults (>10 yrs), to assess how it changes ...
  • Scaling of the appendicular skeleton of the giraffe (Giraffa camelopardalis) 
    Van Sittert, Sybrand J.; Skinner, John; Mitchell, Graham (Wiley, 2015-05)
    Giraffes have remarkably long and slender limb bones, but it is unknown how they grow with regard to body mass, sex and neck length. In this study we measured the length, medio-lateral diameter (ML), cranio-caudal diameter ...
  • The structure and function of giraffe jugular vein valves 
    Mitchell, Graham; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Southern African Wildlife Management Association, 2009-10)
    When a giraffe (Giraffa camelopardalis) lowers its head to drink, blood could enter the jugular vein from the inferior vena cava or regurgitate from the jugular veins into the cranial veins. We investigated the anatomy of ...