TUK (Tukkiana) Collection

Permanent URI for this collectionhttp://hdl.handle.net/2263/82570

Browse

Now showing 1 - 5 of 5

Geregtelike geneeskunde : die multidissiplinêre benadering
(Hatfield : Verkrygbaar van Van Schaik's Boekhandel, 1976) Loubser, J. D.
Ek vra u vergunning om by hierdie geleentheid enkele woorde van dank en waardering uit te spreek. Eerstens my dank aan die Universiteit van Pretoria vir die vertroue in my gestel deur my in hierdie verantwoordelike pos aan te stel. Ek wil graag onderneem om steeds my bes te doen om op 'n verantwoordelike en bevredigende wyse aan die hoe eise en verwagtinge wat ek weet wat gestel mag word, te voldoen.
Some benchmark papers of Professor Jan Cornelis Bonsma : to commemorate his eightieth birthday in Pretoria, 22 March 1989.
([Pretoria] : University of Pretoria, [1989], 1989) Bonsma, J.
Professor Jan Cornelis Bonsma is truly one of the outstanding scientists produced by this University and South Africa. To appropriately honour him on his 80th birthday, the University of Pretoria undertook to publish a selection of his research papers which reflect his important scientific contribution to the animal industry of, particularly, the tropics and subtropics. The editors took the liberty of selecting, metricating and editing nine of his vast output of scientific and technical papers for reproduction in this volume. These papers cover the field of his endeavors in the ecology of domestic animals - of which he, together with A.O. Rhoad, was decidedly a pioneer and leading exponent in the 1940s and 1950s - as well as environmental physiology - where his keen observational powers were the basis of many advances which ultimately led to, inter alia, the creation of the Bonsmara breed of cattle. This name, indeed appropriate, was suggested by his lifelong friend Jim Galpin, and marks a monument to his scientific capabilities. One wonders if any other scientist in the field of animal breeding and genetics has been thus honoured! Jan Bonsma seriously entered the arena of livestock ecology with a paper published in 1940 in Farming in South Africa, then a reputable professional journal. The title was "The influence of climate on cattle. Fertility and hardiness of certain breeds", and the contribution was coauthored by his early assistants at the Messina Experimental Farm in the dry-tropical Limpopo basin, G. D. J. Scholtz and F. J. G. Badenhorst. However, he clearly made his mark in international science with a paper which appeared in the renowned Cambridge Journal of Agricultural Science in 1949, entitled "Breeding cattle for increased adaptability to tropical and subtropical environments".
Livestock philosophy
(Pretoria : University of Pretoria, 1958., 1958) Bonsma, J.
After studying livestock production in various parts of the world, especially among the Bantu tribes, one cannot but come to the conclusion that this type of agriculture is influenced mainly by the cultural background of the people who practise it. Throughout the world one finds that those races who are superstitious, who have no real cultural background of the kind known to the Western Civilization, have made little worthwhile contribution to livestock betterment. Considering Bantu agriculture as an example, it is apparent that, to the Bantu, the animal is a token of wealth, a means of acquiring a wife and, therefore, a necessity under the Lo bolo system. The native has never regarded livestock production as a means of benefitting mankind, since he has never practised it with the object of producing more and better food for his people. Likewise the Hindu, whose whole outlook on the animal is that it is holy. As a result he is not permitted to castrate those bulls which are useless, or carry out selection to improve his herds.
An analysis of factors affecting the efficiency of gains in pigs from birth to weaning
(Not identified, 1936) Bonsma, J.
Although many considerations are involved in raising hogs economically, it can be safely said that the food required to produce a unit of gain in the live weight . on the suckling pig represents the greatest portion of the entire cost of production up to weaning time. Thus food consumption per unit of gain is closely associated with the success or failure of a hog enterprise. Several workers (1 and 2) have found that 76% to 84% of the cost of producing a market hog is made up of feed cost. Those factors which tend to increase the feed required to produce a pound of gain in the suckling pigs will increase the cost of producing a weanling pig and also a market hog. In the present investigation consideration is given to various conditions which influence the amount of feed consumed by suckling pigs to produce a pound of gain in live weight from birth to weaning time.
Breeding tick-repellent cattle
(Pretoria: The University of Pretoria, 1980) Bonsma, Jan
During the period Bonsma was a post-graduate student in Dr J L Lush's class at Iowa State University 1935-1936,he became aware of classic research on breeding discase-resistant plants and animals so that when he was put in charge of Mara and Messina research stams in 1937, he was cognizant of this work. In a paper by Bonsma, Fanning in South Africa, February 1944, Reprint 13, "Hereditary Heartwater-resistant Characters in Cattle Bonsma reviewed some of the literature on this subject, because most cattle that died in the tropical and sub-tropical ranching areas in the Southen1 hemisphere died as a result of tick-borne diseases. In 1944 Bonsma wrote as follows: "1110 success achieved in the breeding of plants possessing a high degree of resistance to diseases is to be attributed to the application of methods based on the principles of genetics. Farm animals fortunately also possess hereditary characters conferring on them a higher degree of resistance to certain diseases. Unfortunately, however, little has hitherto been done in the way of applying this knowledge experimentally in the control of diseases in animals. Considerable attention is, on the other han

Browse

Recent Submissions