"Experientia docet" - Experience is the best teacher
The effect of a dietary leucine excess on the immunoresponsiveness and growth of chickens
The effect of a dietary leucine imbalance on chickens was investigated. The two criteria considered were growth and antibody production following immunization with sheep red blood cells. Three groups of chickens were fed diets containing increasing levels of leucine. Group…
Benutting van appelreste in diëte vir lammers en melkkoeie
Utilization of apple residue in diets for lambs and milking cows The effect of replacing 0%, 33%, 66% and 100% of the maize meal with apple residue in a growth diet containing 45% roughage for lambs was investigated…
Effect of fibre and nitrogen content on the digestibility of Kikuyu (Pennisetum clandestinum)
A series of 12 in vivo digestibility trials, using two-tooth Merino wethers were conducted on freshly-cut green kikuyu herbage. Samples of this herbage were analysed by proximate and acid-detergent analysis. A close relationship was found between crude fibre (CF) and…
Die effek van stygende konsentrasies vismeel op die ware lisienbeskikbaarheid by Wit Leghornhane met en sonder sekums
The effect of increasing levels of fish· meal on true lysine availability in intact and caecectomized White Leghorn roosters. Protein-free diets containing increasing levels (0, 20, 40, 60, 80, and 99%) of normal and heat-damaged fish-meal were force-fed to…
The reproductive responses of two breeds of beef cows and the performance of their progeny in two contrasting environments
The experiment was carried out over three seasons during which a total of 889 Afrikaner and 805 Simmentaler 'cow years' were studied. Nucleus breeding herds of each of these breeds were maintained at stations in the Highland Sourveld and the…
Slageienskappe van Afrino x Merino-kruisings (Kort mededeling)
Four groups of 50 Merino ewes were mated to four Ronderib Afrikaner (RA), four Merino (M), four SA Mutton Merino (SAVM) and four Afrino (A) rams during the autumn of 1983 and 1984. During 1983 a further 50 Merino ewes…
Relationships between growth parameters and scrotal circumference in Simmentaler bulls (Short communication)
Data from 129 young Simmentaler bulls taken at the end of the Phase C growth tests, were used to study the relationship of mass and growth parameters on testes size. Scrotal circumference was positively correlated with body mass and average…
Lambing results obtained with imported Ile de France ram semen (Short communication)
Two batches of Ile de France ram semen frozen in 0,5 ml straws were imported from France during April 1979 and September 1981. Ewes were synchronized and artificial insemination was carried out either 54,5 h (fixed time single insemination) after…
Standardizing initial cooling of sheep semen before freezing (Short communication)
A practical and repeatable method for the cooling, during the processing phase, of sheep semen, with the aim of minimizing inter-experiment variation is described. The superior repeatability of the method can be ascribed to the fact that the cooling rate…
Predictability of steer performance in the feedlot (Short communication)
It will be to the benefit of the feedlot industry if poor performing feeder cattle can be identified at an early stage during fattening and eliminated. This would require a close relationship between early performance and overall performance in the…
Die invloed van voedingspeil op die reaksie van kortgeskeerde Angora en Boerbokke tydens blootstelling aan koue (Kort mededelin
The influence of feeding level on the response of shorn Angora and Boer goats to cold exposure: The effect of nutritional level of shorn Angora and Boer goats on heat production, rectal and skin temperature as well…
The effect of concentrate in meal- or pellet form on milk, protein and butterfat production of Friesian cows receiving Kikuyu gr
The effect of the physical form (meal or pellets) of a dairy concentrate, with kikuyu grazing and oat silage as roughage sources, on milk, protein and butterfat production of Friesian cows was investigated. Twelve comparable Friesian cows from the same…
