Browsing Research Articles (Production Animal Studies) by UP Author "Brown, Geoffrey James"

Browsing Research Articles (Production Animal Studies) by UP Author "Brown, Geoffrey James"

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  • Calcium and phosphorus in unbanded eggs of the Nile crocodile (Crocodylus niloticus) 
    Brown, Geoffrey James; Forbes, Patricia B.C.; Myburgh, Jan G.; Nothling, Johan Oliviette (Wiley, 2020-08)
    Unbanded crocodilian eggs do not form an opaque band around their lesser circumference, indicating fertilization failure or early embryonic death. Assuming they represent fertile eggs prior to the onset of embryonic ...
  • Canine-specific tail-in, head-out sperm agglutination 
    Brown, Geoffrey James; Nothling, Johan Oliviette; De Cramer, Kurt Guido Mireille (Wiley, 2021-10)
    An interesting pattern of tail-in, head-out sperm agglutination was identified in a Brucella canis seronegative subfertile dog. Centrifuged seminal plasma from this dog could induce a similar pattern of agglutination in ...
  • A comparison of calcium and phosphorus in components of fertile and size-matched unbanded Nile crocodile eggs 
    Brown, Geoffrey James; Forbes, Patricia B.C.; Myburgh, Jan G.; Nothling, Johan Oliviette (NISC Pty (Ltd) and Informa Limited (trading as Taylor and Francis Group, 2021)
    Research in other species suggests that the source of embryonic calcium (Ca) and phosphorus (P) for Crocodylus niloticus is likely yolk and shell. Using inductively coupled plasma optical emission spectroscopy (ICP-OES), ...
  • Effect of di(n- butyl) phthalate on the blood–testis barrier during puberty onset 
    Molele, Reneilwe A.; Zakariah, Musa; Ibrahim, M.I.A.; Mahdy, Mohamed A. A.; Brown, Geoffrey; Fosgate, Geoffrey Theodore; Brown, Geoffrey James (Wiley, 2023-05)
    Di(n-butyl) phthalate (DBP) is considered a substance of serious concern because of its reproductive toxicity and endocrine-disrupting properties. Exposure to DBP causes morphological and functional changes in the male ...
  • The effect of Rift Valley fever virus clone 13 vaccine on semen quality in rams 
    Brown, Geoffrey James; Venter, Estelle Hildegard; Annandale, C.H. (Cornelius Henry); Morley, Paul S. (AOSIS OpenJournals, 2015-06-15)
    Rift Valley fever (RVF) is an arthropod-borne viral disease of importance in livestock and humans. Epidemics occur periodically in domestic ruminants. People in contact with infected livestock may develop disease that ...
  • Failure to detect equid herpesvirus types 1 and 4 DNA in placentae and healthy new-born thoroughbred foals 
    Brown, Lara Jean; Brown, Geoffrey James; Kydd, Julia; Stout, T.A.E. (Tom); Schulman, M.L. (Martin) (AOSIS OpenJournals, 2019-05-30)
    Equid herpesvirus type 1 is primarily a respiratory tract virus associated with poor athletic performance that can also cause late gestation abortion, neonatal foal death and encephalomyelopathy. Horizontal transmission ...
  • Junctional complexes of the blood-testis barrier in the Japanese quail (Coturnix Coturnix japonica) 
    Molele, Reneilwe A.; Ibrahim, Mohammed I.A.; Zakariah, Musa; Mahdy, Mohammed A.A.; Clift, Sarah J.; Fosgate, Geoffrey Theodore; Brown, Geoffrey James (Elsevier, 2022-10)
    This study investigated the developmental changes in the adherens junctions, gap junctions, as well as tight junctions forming the blood-testis barrier (BTB) in Japanese quail (Coturnix Coturnix japonica) testis. Testicular ...
  • Nile crocodile (Crocodylus niloticus) : egg mass relative to egg component mass in unbanded and fertile eggs 
    Brown, Geoffrey James; Forbes, Patricia B.C.; Myburgh, Jan G.; Nothling, Johan Oliviette (Elsevier, 2019-04)
    Crocodylus niloticus eggs are a useful starting point to study reproduction in this species. Using samples collected from a single farm during a single breeding season, the present research aimed to describe and compare ...