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"Experientia docet" - Experience is the best teacher

The repeatability of reproduction rate in the Tygerhoek Merino flock

  • 1987
  • Issue: 1
  • Volume: 17
S.W.P. Cloete & H.J. Heydenrych Page: 15 - 21

The repeatability of reproduction rate at 2 years or up to 3 years of age was investigated by regression methods considering subsequent reproduction averaged over a number of lambing opportunities or within subsequent age groups. Results from the study suggested…

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Testicular development in Dorper, Döhne Merino and crossbred rams

  • 1987
  • Issue: 1
  • Volume: 17
S.J. Schoeman & G.C. Combrink Page: 22 - 26

Testicular development from 3 to 14 months of age was examined in Dorper (DD), Dohne Merino (DM) and crossbred (Meatmaster; MM) rams. Testicular measurements included testis volume (TV), diameter (TD), length (TL) and scrotal circumference (SC). Both TD and SC…

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The relative nutritive value of irradiated spray-dried blood powder and heat-sterilized blood meal as measured in combination wi

  • 1987
  • Issue: 2
  • Volume: 17
T.E.H. Downes, L.D. Nourse, F.K. Siebrits & J.W. Hastings Page: 55 - 58

A method of processing blood meal in which the nutritive value of the protein is preserved is described, since appreciable losses occur in the nutritive value of the protein when prepared by heat sterilization with drying at atmospheric pressure in…

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The relationship between testis size and stimulated plasma testosterone concentrations and its influence on mating performance i

  • 1987
  • Issue: 2
  • Volume: 17
S.J. Schoeman, C. Maree & G.C. Combrink Page: 63 - 69

Testis size, stimulated testosterone concentrations and mating performance (serving capacity, libido score and serve : mount ratio) of 14 Dorper rams were measured in the breeding season (March) in order to determine the influence of testis size and testosterone concentration…

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Selection response with index selection in three commercial Merino flocks

  • 1987
  • Issue: 2
  • Volume: 17
D.G. Poggenpoel & C.A. van der Merwe Page: 70 - 73

Members of the Performance Testing Division of the Merino Stud Breeders Association of South Africa select their young sheep according to a selection index, calculated from objective measurements of the following four characteristics body mass, clean fleece mass, fibre diameter…

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Aspects of cattle production in Transkei

  • 1987
  • Issue: 2
  • Volume: 17
T.J. Bembridge Page: 74 - 78

The importance and problems of cattle production in Transkei are discussed in this paper. Findings show a situation of low levels of production and deteriorating natural resources owing to mismanagement and overstocking.      

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An evaluation of the lamb and mutton carcase grading system in the Republic of South Africa. 2. The use of fat measurements as

  • 1987
  • Issue: 2
  • Volume: 17
G.G. Bruwer, R.T. Naudé, M.M. du Toit, A. Cloete & W.A. Vosloo Page: 85 - 89

A total of 104 carcases were selected on the market in three age groups and four mass classes representative of the six fat classes of the classification system for carcase evaluation. Four subcutaneous fat thickness measurements were taken on the…

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An evaluation of the lamb and mutton carcase grading system in the Republic of South Africa. 3. Fatness score, conformation scor

  • 1987
  • Issue: 2
  • Volume: 17
G.G. Bruwer, R.T. Naudé & W.A. Vosloo Page: 90 - 94

    The influence of fatness, conformation and carcase mass as individual predictors of carcase composition, was determined in 104 carcases which were fully dissected and of which carcase composition was determined. Chemical analysis was done on each carcase and…

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