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"Experientia docet" - Experience is the best teacher

Plasma progesterone levels in lactating ewes after hormone-induced ovulation during the non-breeding season

  • 1980
  • Issue: 2
  • Volume: 10
I.C. Fletcher, A.W. Lishman, B. Thring and J.A. Holmes Page: 151 - 157

Oestrus, ovulation and peripheral plasma progesterone concentrations were recorded in 58 lactating South African Mutton Merino ewes treated variously with progestagen, pregnant mare serum gonadotrophin (PMSG), prostaglandin and gonodotrophin releasing hormone (GnRH) at 2 post partum intervals (22 or 35…

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In vivo estimation of body composition in cattle with tritium and urea dilution. II. Accuracy of prediction equations of the che

  • 1980
  • Issue: 2
  • Volume: 10
H.H. Meissner, J.H. van Staden and E. Pretorius Page: 175 - 181

Linear regression equations with tritium or urea space, live mass and carcass mass (where applicable) as independent variables, and the chemical components of the carcasses of bull were established. Similar equations were calculated for the chemical components of the non-carcass…

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In vivo estimation of body composition in cattle with tritium and urea dilution. III. Accuracy of prediction equations for muscl

  • 1980
  • Issue: 2
  • Volume: 10
H.H. Meissner, R.T. Naude, H.J. Venter and E. Pretorius Page: 183 - 188

Linear regression equations with tritium or urea space and live mass as independent variables and muscle, bone and dissectable fat in bull carcasses were calculated. The accuracy of these equations was compared to othe15 similar to these, but where the…

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Sodium hydroxide treated wheat straw for sheep

  • 1980
  • Issue: 2
  • Volume: 10
J.P. Pienaar, H.S. Hofmeyr, K.I. Plaut and L. Grattarola Page: 209 - 214

Voluntary feed intake, digestibility and rumen flow- and fermentation dynamics were studies using sheep. NaOH treated (5 % w/w) wheat straw, washed and. unwashed as well as untreated straw were compared. Results indicated that washing the straw had little effect…

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Predicting voluntary intake on medium quality roughages

  • 1980
  • Issue: 2
  • Volume: 10
J.P. Pienaar, C.Z. Roux, P.J.K. Morgan and L. Grattarola Page: 215 - 225

A first order model for predicting voluntary intake was applied to sheep fed roughages differing in quality. Important variables identified in this study were the rumen capacity of the animals, the first order rate constant for fermentation of the diet,…

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The estimation of preweaning energy intake from litter mass in rats

  • 1980
  • Issue: 2
  • Volume: 10
M.M. Scholtz and C.Z. Roux Page: 233 - 235

An estimate of the total energy intake of litters until weaning, including both energy obtained in-utero and that derived post-natally from milk consumed, is often required in experiments on growth efficiency. Frequently it is, however, impossible to measure this energy directly.…

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