"Experientia docet" - Experience is the best teacher
Heritability estimates for different Kleiber ratios obtained from growth performance data in a Hereford herd (Short Communicatio
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.
Effect of shade on various parameters of Friesian cows in a Mediterranean climate in South Africa. 1. Feed and water intake, mil
The effect of a shade structure on the feed intake, water intake, milk production and milk composition of Dutch-type Friesian cows in a temperate climate was determined over three summer seasons. The shade structure reduced (P < 0.01) radiation as…
Effect of shade on various parameters of Friesian cows in a Mediterranean climate in South Africa. 2. Physiological responses
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…
An investigation into the feasibility of culturing rat embryos in media derived from sheep serum
The use of three media to support growth and development in headfold Sprague-Dawley rat embryos cultured for 48 h, for possible use in a teratogen assay, was investigated using sheep serum (SM) and sheep serum mixed with rat serum (80%…
The effect of the malignant hyperthermia gene on carcass characteristics of commercial crossbred pigs in the Western Cape (Short
Malignant hyperthermia (MH) genotype, as expressed by the halothane genotype, was determined on a random sample of 100 pigs originating from the Western Cape. The pigs were slaughtered to investigate the effect of MH genotype on certain carcass characteristics and…
Comparison of triticale cultivars with maize grain for finishing lambs (Short Communication)
Grains from five triticale cultivars on the South African market (Usgen 7; 10; 14; 18; 19) were compared with each other and to maize in enriched mixtures for lambs in a feedlot. The grain was enriched by adding 12% of…
Genetic and environmental effects on performance traits of Simmentaler cattle on the Transvaal Highveld
Simmentaler cattle of the Highveld Region Development Institute were used in this study to determine the genetic and envi¬ronmental effects on birth mass, weaning mass and the mass gain from birth to weaning. During winter the animals were kept in…
The relationship between pre- and post-weaning performance of lambs on Italian ryegrass
The relationship between pre- and post-weaning performance of lambs on Italian ryegrass was investigated by grazing lambs at different stocking rates. A positive correlation was found between both the pre-weaning stocking rate (P = 0.008) and weaning mass (P =…
