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"Experientia docet" - Experience is the best teacher

The effect of progestogen and oestradiol priming on luteal function in seasonally anoestrus GnRH-treated ewes (Short communicati

  • 1984
  • Issue: 3
  • Volume: 14
J. Grobbelaar, W.A. Botha & A.W. Lishman Page: 143 - 145

Seasonally anoestrus Corriedale ewes receiving 1 ml GnRH (0,0042 mg buserelin-acetate) IM, were pretreated as follows: (i) 5 Days with intravaginal progesterone-impregnated sponges removed 24 h prior to GnRH (P-group); (ii) 6 h with subcutaneous oestradiol silicone rubber implants removed…

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Improving efficiency in pig production

  • 1984
  • Issue: 4
  • Volume: 14
V.R. Fowler Page: 147 - 151

The relative importance of different components of efficiency depends on whether one's interest is biological or economic. A study of the elements of biological efficiency shows that the choice of slaughter mass has a profound effect, and that in relative…

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Reproduction rate as a factor in meat production

  • 1984
  • Issue: 4
  • Volume: 14
A.W. Lishman, A.G. Paterson & S.M. Beghin Page: 164 - 168

The need to optimize rather than maximize rates of reproduction has been demonstrated for various production situations. In a highly intensive system, incorporating the use of artificial insemination, increasing the calving rate from 75 to 85% did not yield more…

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Relationship between climatic factors and the diet selected by ruminants on Karoo veld (Short communication)

  • 1984
  • Issue: 4
  • Volume: 14
P.J.L. Zeeman & A.J. Fourie Page: 178 - 180

Diet selection and intake by cattle, goats and sheep was related to climatic factors by principal-component analysis. Digestibility of selected material and digestible organic matter intake per metabolic size (DOMI/kg W0.75) were significantly correlated to a principal component combining rainfall,…

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