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"Experientia docet" - Experience is the best teacher

Is genetic selection for skin nodule traits of ostriches feasible?

  • 2004
  • Issue: 6
  • Volume: 34
A. Meyer, S.W.P. Cloete, J.B. van Wyk and S.J. van Schalkwyk Page: 29 - 31

Preliminary genetic parameters for nodule traits of ostrich skins were estimated to examine whether genetic improvement of skin quality is feasible. Average nodule size and density per dm² were determined on five localities on each of 439 ostrich skins. An…

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Testday models for production traits in dairy cattle

  • 2004
  • Issue: 6
  • Volume: 34
B.E. Mostert, E. Groeneveld and F.H.J. Kanfer Page: 35 - 37

Methodology has been developed to implement testday models in the national genetic evaluation of dairy breeds for production traits in South Africa. Positive definite covariance matrices have been estimated, using multitrait, multi-lactation, fixed regression testday BLUP animal models, including testday…

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The influence of dietary energy concentrations on scrotal, testicular and semen characteristics of young Dorper rams

  • 2004
  • Issue: 6
  • Volume: 34
N. Bester, L.M.J. Schwalbach, H.J. van der Merwe, J.P.C. Greyling and M.D. Fair Page: 53 - 55

A study with the aim to evaluate the effects of different dietary energy concentration (8.23, 9.77 and 11.32 MJ ME/kg DM) on scrotal, testicular and semen characteristics of young Dorper rams was conducted during the breeding season. Thirty-six 11-12 month…

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Effect of different cryodiluents and thawing methods on the post-thaw motility of African Lion (Panthera leo) spermatozoa

  • 2004
  • Issue: 6
  • Volume: 34
H. Stander-Breedt, L.M.J. Schwalbach, J.P.C. Greyling and N.M Loskutoff Page: 74 - 76

A study with the aim of developing a protocol for the successful cryopreservation and thawing of African lion (Panthera leo) sperm was conducted. Semen from six chemically immobilized adult lion males was collected by electro-ejaculation and frozen using Biladyl and…

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