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Browsing South African National Veterinary Repository by Author "Marais, J.S.C."
Now showing items 1-20 of 21
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Marais, J.S.C.; Smuts, D.B.; Du Toit, P.J. (Pretoria : The Government Printer, 1940)The supplementary effect of methionine on lucerne, lysine on oats seed, cystine and methionine on peanutmeal, cystine on linseedmeal as well as the supplementary relationship between yellow maize and lucerne and of yellow ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : Government Printer, 1938)1. By the application of the mold method the individual surface area of 17 chickens of approximately one month of age were determined and formulae evolved for the prediction of the surface area. The value for K in the Meeh ...
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Marais, J.S.C.; Smuts, D.B.; Du Toit, P.J. (Pretoria : The Government Printer, 1940)1. The biological values of whole white maize and whole yellow maize are 76 ± 1.91 and 67 ± 0.98 at approximately 8 per cent. protein level. 2. The proteins of white maize are significantly better than that of yellow ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1939)By means of nitrogen metabolism experiments with white fish meal on rats and sheep, it was found that the apparent and true digestibilities of the white fishmeal protein are respectively 79 and 97 percent with rats and 63 ...
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Marais, J.S.C.; Smuts, D.B.; Du Toit, P.J. (Pretoria : The Government Printer, 1940)The biological values and digestibilities of the proteins of whole oats seed, unpearled barley, wheatbran and pollard have been determined and a figure expressing the percentage utilizable protein calculated.
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Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1944)The isolation of the alkaloid dicrotaline from Crotalaria dura and Crotalaria globifera has been described. On alkaline hydrolysis dicrotaline yields retronecine and an unknown dibasic acid, dicrotalic acid.
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Smuts, D.B.; Marais, J.S.C.; DuToit, P.J. (Pretoria : The Government Printer, 1940)From a study on the dry matter consumption of sheep under natural conditions of grazing, it is evident that the quantity consumed is not a factor in the loss of weight in sheep during winter. It appears from these ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : Government Printer, 1939)By means of the paired feeding method it was shown that methionine supplemented lucerne significantly better than cystine. If lucerne is supplemented by methionine plus cystine and compared with lucerne supplemented by ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : Government Printer, 1938)By means of a nitrogen free diet the time period for the attainment of the endogenous nitrogen level has been established in sheep. It appears that the preliminary protein period is a determining factor in the length of ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1939)In a study on the endogenous nitrogen excretion of immature sheep, it was found that young sheep reach their endogenous level on the 6th day, after having been on a standard ration of 14 per cent lucerne protein. The ...
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Marais, J.S.C.; Smuts, D.B.; DuToit, P.J. (Pretoria : The Government Printer, 1940)By means of paired feeding tests, it has been shown that sesamemeal is deficient in cystine and that cottonseedmeal is not deficient in this amino acid. Bran and coprameal are apparently not deficient in lysine, while the ...
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Marais, J.S.C.; Rimington, C.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J. (Union of South Africa : Dept. of Agriculture, 1934)The toxic substance present in the plant Dimorphoteca cuneata has been isolated and identified as the cyanogenetic glucoside "linamarin" or acetonecyanhydrin glucose ether. An improved method of extraction has been described. ...
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Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1943)A method for the isolation of potassium cymonate, the toxic principle of Dichapetalum cymosum has been described. The M.L.D. of potassium cymonate for the rabbit is 0.5 to 0.75 mgm. per kilogram bodyweight.
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Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1944)The identity of the toxic substance of "Gifblaar", Dichapetalum cymosum, has been established to be monofluoroacetic acid. The potassium and calcium salts as well as the p-nitrobenzyl and p-bromophenacyl esters of ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : Government Printer, 1938)By means of the paired feeding method, it has been shown that the addition of cystine to lucerne significantly enhances the growth promoting properties of the latter, and that when peanutmeal is supplemented by oatmeal the ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1938)By means of the nitrogen balance-sheet method a biological value of 55 for soyabeans and 78 for linseedmeal at approximately 8 per cent. level has been obtained. Utilizing the same method, and substituting an equivalent ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1938)1. By means of the balance-sheet method, it has been shown that the biological value of lucerne protein for sheep is 60 and that the addition of cysteine does not effect this biological value. 2. The apparent digestibility ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1938)By means of the paired feeding method, the possible indispensable amino acid deficiencies of peanutmeal, coprameal, linseedmeal and soyabeanmeal have been investigated. It has been found that peanutmeal is not deficient ...
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Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : The Government Printer, 1940)By means of metabolism experiments on mature and young sheep it was shown that approximately 81 grams of maize will supplement April grazing successfully in respect of protein if the energy requirements are satisfied. Due ...
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Smuts, D.B.; Marais, J.S.C.; DuToit, P.J. (Pretoria : The Government Printer, 1940)By means of controlled metabolism experiments it was shown that the biological value of the proteins in the natural grazing of the Transvaal varies according to the season of the year. During April the average biological ...
Now showing items 1-20 of 21