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"Experientia docet" - Experience is the best teacher

Hormone levels in peripheral plasma of the Afrikaner cow 1. Progesterone and luteinizing hormone levels during the oestrous cycl

  • 1978
  • Issue: 1
  • Volume: 8
W.A. Coetzer, C.H. van Niekerk, J.C. Morgenthal and J.M. van der Westhuysen Page: 1 - 5

Concentrations of progesterone and luteinizing hormone were determined in peripheral blood plasma during the oestrus cycle of three non-lactating Afrikaner cows. Blood samples were drawn daily during the luteal phase (Day 3-16) and every 8 hours from Day l7 to…

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Hormone levels in peripheral plasma of the Afrikaner cow II Progesterone and total unconjugated oestrogen levels during late ge

  • 1978
  • Issue: 1
  • Volume: 8
W.A. Coetzer, C.H. van Niekerk and J.C. Morgenthal Page: 7 - 10

Progesterone and total unconjugated oestrogen concentrations in the peripheral blood of 4 Afrikaner cows during late gestation and parturition were determined by RIA. From l2-18 days prepartum, progerone levels ranged .from 8.4 to 13,0 ng/ml and subsequently declined to 3,7-8,2…

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Hormone levels in the peripheral blood of the Afrikaner cow III Progesterone levels during the post partum period

  • 1978
  • Issue: 1
  • Volume: 8
W.A. Coetzer, C.H. van Niekerk and J.C. Morgenthal Page: 11 - 14

Following parturition blood samples were collected daily from 5 mature lactating cows until the first post partum oestrous period. Plasma progesterone concentration as determined by RIA was applied to evaluate post partum ovarian activity. Parturition to first oestrus varied from…

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Effect of ambient temperature on farrowing rate in pigs

  • 1978
  • Issue: 2
  • Volume: 8
R.D.V. Robinson and B.D.H. van Niekerk Page: 105 - 109

Records kept over a 4-year period on a 300-sow Natal north coast farm show that reproductive efficiency in pigs is markedly depressed during the hottest months of the year. Under these conditions mean monthly temperatures in excess of 22 C…

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Vrugbaarheid van vleisbeeste op die Soutpan beesplaas

  • 1978
  • Issue: 2
  • Volume: 8
G. Marincowitz Page: 119 - 123

The conception rates of 495 lactating cows and 99 replacement heifers were compared over a 3-year period on an extensive cattle ranch in the sour mixed bushveld. A summer breeding season and controlled selective grazing were applied. A protein-rich dicalciumphosphate…

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Invloed van fisiese vorm van mieliegraan en aanvullende proteienvoeding op die benutting van hoë kragvoerrantsoene deur vleisbee

  • 1978
  • Issue: 2
  • Volume: 8
H.J. van der Merwe, A.P. van Schalkwyk en L.J.J. van Rensburg Page: 131 - 136

The substitution of whole maize grain for maize meal in high concentrate rations (±20% silage on dry basis) for young beef cattle did not significantly lower intake, digestible energy content of ration, mass gain and feed efficiency (2-5%). The milling…

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