• Calf paratyphoid III. The transmission of anti-bodies to newly-born calves 

  Henning, M.W.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  1. In a study of the transmission of anti-bodies from immunized pregnant cows to the colostrum and to their progeny it was noticed that the agglutinin titre of the colostral whey and of the calf's serum might be several ...
• Calf paratyphoid II. Artificial immunization 

  Henning, M.W.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  1. Immunization experiments performed on mice with various vaccines prepared from S. dublin and other Salmonella species showed that a formalinized aluminium hydroxide precipitated vaccine gave the best protection against ...
• Calf paratyphoid I. A general discussion of the disease in relation to animals and man 

  Henning, M.W.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  1. The incidence of calf paratyphoid in various countries and its relationship to disease in adult cattle, in other species of animals, and in human beings are reviewed. 2. The isolation of 507 strains of Salmonella ...
• Infertility in mares caused by ovarian dysfunction 

  Van Rensburg, S.W.J.; Van Heerden, J.S.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  (1) The ovaries of 24 mares were examined rectally during a total of 52 oestrous periods in the 1949-51 breeding seasons. Only 27 of the 52 periods ended in ovulation. In 24 of the 27 normal periods the mares were mated ...
• Physiological studies on eructation in ruminants 

  Weiss, K.E.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  (1) The eructation reflex in sheep and cattle, and factors affecting it, have been studied mainly by the method of forced air insufflation and direct recording of intraruminal pressure. (2) Eructation is a complex, ...
• The significance of reflex salivation in relation to froth formation and acute bloat in ruminants 

  Weiss, K.E.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  (1) Frothing of ruminal ingesta is the main cause of bloat in sheep on green lucerne (2) It was found that the formation of froth is dependent on the consistency of the ruminal ingesta which in turn is influenced by ...
• The influence of enrichment of maize meal on the growth of rats 

  Myburgh, S.J.; Groenewald, J.W.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  Maize products are notoriously deficient in certain essential nutrients, amongst others, some members of the B-complex vitamins. Such deficiencies are furthermore aggravated in processing maize. Two maize products, ...
• Does bovine congenital porphyrinuria (pink tooth) produce clinical disturbances in an animal which is protected against the sun? 

  Fourie, P.J.J.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  An ox, No. 7017, suffering from bovine congenital porphyrinuria (pink tooth) and excreting as much as 1•6 gm. of total pophyrins in faeces and urine per day, was still in reasonably good health at the age of 18 years. ...
• An evaluation of the acaricidal properties of aldrin and dieldrin for the control of sheep scab 

  Fiedler, O.G.H.; Du Toit, R.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  It may be concluded from the experiments conducted which, though on a small scale, nevertheless represent a severe test of the insecticides used, that Dieldrin is an extremely potent and quick-acting acaricide. Against ...
• Report on the value of Isodrin and Endrin as potential protecting agents against blowfly strike in sheep 

  Du Toit, R.; Fiedler, O.G.H.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  Two new synthetic chlorinated hydrocarbon insecticides Isodrin and Endrin have been tested for their larvicidal effect against L. cuprina and for the duration of the period they afford protection against artificial strike. ...
• Comparative intradermal tests between concentrated P.P.D. and diluted P.P.D. tuberculins in relation to non-specific tuberculin reactors 

  Fourie, P.J.J.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  1. In a herd of 760 animals which has for years been more or less regularly tuberculin-tested and in which for years no case of tuberculosis was found quite a large number of animals showed sensitization at an annual ...
• The stability of neurotropic African horsesickness virus in solutions of different chemical composition 

  Polson, A.; Van Rooy, P.J.; Lawrence, S.M.; Dent, J.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  (1) The viability of neurotropic African horsesickness virus was tested in media containing various salts, different amino acids, gelatine, "Dextran", chick embryo extract, serum saline and egg white. Of these, egg white ...
• The isolation of virus in mice from cases of horsesickness in immunized horses 

  Mclntosh, B.M.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  It has been shown that whereas blood obtained during the breakdown reaction in immunized horses may be non-pathogenic for mice it is still capable of infecting horses, dogs and ferrets. Due to this fact it is often. ...
• The parasiticidal effect of aureomycin (Lederle) on Babesia equi (Laveran 1899) in splenectomised donkeys 

  Jansen, B.C.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  Veterinarians in countries where tick-borne diseases are prevalent are well acquainted with the difficulties encountered in the treatment of equine Babesiosis ( = Nuttaliosis). Affected animals do not respond satisfactorily ...
• The protection of sheep against blowfly strike. I. An evaluation of certain organic insecticides 

  Du Toit, R.; Fiedler, O.G.H.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  1. Higher concentrations of the new organic insecticides are necessary to achieve a complete kill of first instar larvae of Lucilia cuprina Wied., when contact with the insecticides is short than is necessary for mature ...
• A new African tick parasite, Hunterellus theilerae sp. n. 

  Fiedler, O.G.H.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)
• Ticks in the South African Zoological Survey collection. Part VII. Six lesser known African Rhipicephalids 

  Theiler, Gertrud; Robinson, Britha N.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)
• Zoological Survey of the Union of South Africa. Tick survey. Part VII. Distribution of Haemaphysalis leachi, the yellow dog tick 

  Theiler, Gertrud; Robinson, Britha N.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  1. The distribution of Haemaphysalis leachi is given in terms of political divisions as well as in terms of vegetational coverage. 2. The factor playing the most important role in limiting the spread of H. leachi appears ...
• The Onderstepoort small animal colony 

  Wilson-Jones, G.; Groenewald, J.W.; Quinlan, J.B.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)
• The cardiac glycoside from Urginea rubella Baker. Part II. Hydrolysis of rubellin and pro-rubellidin 

  Louw, P.G.J.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1953)

  1. The isolation of an unusual sugar component, viz. a sugar acid derivative, obtained by the hydrolysis of rubellin, is reported. 2. Hydrolysis of pro-rubellidin under various conditions gave products which pointed ...

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