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"Experientia docet" - Experience is the best teacher

Direct and maternal additive and heterotic effects in crossbreeding Hereford, Simmentaler and Afrikaner cattle

  • 1993
  • Issue: 3
  • Volume: 23
S.J. Schoeman, J.G.E. van Zyl and R. de Wet Page: 61 - 66

Data from purebred and crossbred cattle, consisting of the Hereford (H), Simmentaler (S) Afrikaner (A) breeds, were analysed to estimate breed additive effects, individual heterotic effects, breed maternal and average maternal heterotic effects. The traits studied were birth mass, weaning…

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Relationship between early growth traits in Elsenburg Dormer sheep stud

  • 1993
  • Issue: 3
  • Volume: 23
J.B. van Wyk,· G.J. Erasmus, K.V. Konstantinov and J. van der Westhuizen Page: 81 - 84

Correlations were estimated from a total of 7740 lamb records, collected from 1943 to 1990, from the progeny of 215 sires of the registered Elsenburg Dormer sheep stud. Phenotypic correlations were generally positive and medium to high except for a…

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Rumen ammonia concentrations, and non-ammonia nitrogen passage to and apparent absorption from the small intestine of sheep inge

  • 1993
  • Issue: 3
  • Volume: 23
H.H. Meissner, M. Smuts, W.A. van Niekerk and O. Acheampong-Boateng Page: 92 - 97

Non-ammonia nitrogen (NAN) passage to the small intestine and disappearance of NAN in that organ have been studied in multi-cannulated sheep on pasture or fed indoors. Forages under investigation included a number of subtropical grasses, foggages and hay, temperate grasses,…

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Growth response, sexual development, carcass and meat quality of zinc tannate treated bulls

  • 1993
  • Issue: 5
  • Volume: 23
P.E. Strydom, J.F. de Bruyn, R.T. Naudé and N.H. Casey Page: 151 - 158

Effects of intratesticularly administered zinc tannate (ZT) on growth performance, sexual development, slaughter, carcass and meat quality characteristics of young bull calves (-225 kg, 7 months old) were investigated. Comparisons were made across a three (treatments: ZT animals, intact bulls…

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