skip to Main Content
Join SASAS

"Experientia docet" - Experience is the best teacher

Somatotropin physiology — a review

  • 1994
  • Issue: 1
  • Volume: 24
J.G. van der Walt Page: 1 - 9

The continuing search for improved efficiency has led to the introduction of exogenous growth and lactation promotants to enhance traditional animal production systems. Various species-limited somatotropins have been synthesized by means of recombinant gene technology, thereby allowing milk production in…

Read more

Effect of melatonin implants, flushing and teasing on the reproductive performance of spring-mated Dohne Merino ewes

  • 1994
  • Issue: 1
  • Volume: 24
C.B. Nowers, W.A. Coetzer and J.C. Morgenthal Page: 22 - 26

The effect of melatonin implants, flushing and teaser rams on the reproductive performance of spring-mated Dohne Merino ewes was investigated. The ewes (n = 534) were randomly allotted to four treatments, namely (1) no treatment (control), (2) melatonin implants (melatonin),…

Read more

Synchronization of oestrus in sheep: Use of different doses of progestagen outside the normal breeding season (Short communicati

  • 1994
  • Issue: 1
  • Volume: 24
J.P.C. Greyling, W.F. Kotzé, G.J. Taylor, W.J. Hagendijk and F. Cloete Page: 33 - 37

One hundred and thirty Merino ewes were used to test the efficiency of different doses of medroxyprogesterone acetate (MAP) progestagen to synchronize oestrus outside the breeding season. Three treatments, consisting of intravaginal progestagen doses (60 mg, 40 mg, and halved…

Read more

Effect of shade on various parameters of Friesian cows in a Mediterranean climate in South Africa. 2. Physiological responses

  • 1994
  • Issue: 2
  • Volume: 24
C.J.C. Muller, J.A. Botha, W.A. Coetzer and W.A. Smith Page: 56 - 60

The effect of a shade structure on some physiological parameters of lactating Dutch-type Friesian cows was determined over three consecutive summer periods. Plasma cortisol concentration of no-shade cows was significantly (P < 0.05) higher than that of shade cows during…

Read more

Genetic relationship between growth traits in Bonsmara heifer and bull calves on different nutritional regimes

  • 1994
  • Issue: 2
  • Volume: 24
H.E. Theron, M.M. Scholtz and C.Z. Roux Page: 67 - 70

A system of feeder–breeder dimorphism (large, fast growing offspring in feedlots obtained from small, low mainten¬ance cows on natural pastures) would be profitable in South Africa. The possibility of a genetic basis for feeder–breeder dimorphism was estimated by calculating genetic…

Read more

Heritability estimates for different Kleiber ratios obtained from growth performance data in a Hereford herd (Short Communicatio

  • 1994
  • Issue: 2
  • Volume: 24
E. Koster, J. van der Westhuizen and G.J. Erasmus Page: 71 - 72

Heritability estimates for Kleiber ratios associated with growth were obtained for a Hereford stud, subjected to selection for growth over an 11-year-period. Heritability estimates obtained indicate that growth efficiency in terms of the Kleiber ratio is moderately heritable.

Read more
Back To Top