47 research outputs found
Some techniques in corneal grafting
Some of the special procedures adopted in both lamellar and full-thickness keratoplasty are described, and several cases presenting unusual features and requiring an unusual approach are discussed
Grass hay as a maintenance ration for sheep during winter
Constant live-weight has been used as criterion in measuring the maintenance
requirement of adult sheep during winter. It has been found that
an animal weighing 100 lb. requires 2.106 lb. of a grass hay, containing
1622 Calories of metabolizable energy, to maintain its weight at an approximately
constant level.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format
The influence of frequency of cutting on the yield, chemical composition, digestibility and nutritive value of some grass species
Five species of indigenous grasses, namely Cloris gayana,
Setaria Lindenbergiana, Cencrus Ciliaris, Digitaria Pentzii Pretoria small, and Panicum Maximum, were established each in five replications on 25 plots, each measuring (24 x 17) square feet, in a Latin Square arrangement. Each plot was again subdivided into five equal portions and a different treatment allocated at random to each subplot within a main plot. The effective cutting area of a subplot measured (22 x 3) square feet. The experiment covered two growing seasons and various treatments were applied.
The objects of the investigation were to study the effect of the treatments on the yield, chemical composition, digestibility and the nutritive value of the grasses under natural conditions of soil and climate. To test the digestibility the produce obtained under any one cutting treatment for all the species was combined as a single sample. Three adult Merino wethers were employed and the hay samples were tested in nine successive periods.
Since the results obtained with the grass species studied on the particular type of soil and under the climatic conditions obtaining during the two seasons of the investigation may not be taken to apply generally, it is not possible to lay down clear directions for the practical man. Nevertheless from a consideration of the evidence of the data obtained in this experiment as a whole it seems to be a warrantable conclusion that a system of cutting grasses at approximately 2-monthly intervals during the growing season for the purpose of providing feed during times of scarcity will result in the most economical utilisation of indigenous grass species under natural conditions.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.Includes bibliographical referencesab201
The relative digestibility of the constituents of the carbohydrate complex of grasses at successive stages of growth with reference to their partition into crude fiber and nitrogen-free extract according to the standard method for feeding stuff analysis
The structural constituents, natural cellulose, hemicelluloses and lignin, in
graminaceous food materials, faeces, and the crude fibre isolated from these have
been determined. The results showed that:
(1) crude fibre is almost wholly composed of natural cellulose but that the method for its isolation underestimates the natural cellulose content
of the feed and of the faeces;
(2) natural cellulose is the most digestible portion and lignin the least
digestible portion of the cell-wall structure. From this finding it is
inferred that a closer association exists between the lignin and the
hemicelluloses than between the former and the natural cellulose
of the cell-wall complex;
(3) with regard to roughages the standard feeding stuffs analysis does not
divide the carbohydrate complex into substances of relatively low and
substances of relatively high digestibility.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format
The colorimetric determination of sodium in vegetation
(1) A revision of the method by Malan and Van der Lingen for the colorimetric determination of sodium in vegetation is described in detail. (2) Evidence is presented to show that:- (a) .04-0.1 mgm. Na can be determined with reasonable accuracy in the presence of 0.1 mgm. P; when 0.1- 0.2 mgm. Na is to be determined 0.2 mgm. P, and when 0.2-0.8 mgm . Na, up to 0.4 mgm. P may be present. (b) The interference of K is dependent upon absolute concentration and temperature; working at ordinary laboratory temperature ( ± 25° C.) not more than 0.8 mgm. K should be present in the aliquot for a determination. (c) At 26° C. precipitation is complete within experimental error in 30 minutes.The articles have been scanned in colour with a HP Scanjet 5590; 600dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.mn201
A routine method for the determination of soluble ash in plant material
A routine method for the determination of soluble ash in plant material is described in detail. Evidence is presented to show that the results obtained by this rapid method compare very favourably with those obtained by following the standard procedure.The articles have been scanned in colour with a HP Scanjet 5590; 600dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.mn2015mn201
The influence of varying maize supplements on the digestibility of the cellulose in a poor veld hay in relation to the bacterial population of the rumen of sheep with a note on the nitrogen metabolism
From the results of a series of metabolism studies on sheep with open
rumen fistulae in which a basal ration of winter grazing was supplemented
with meatmeal and increasing amounts of crushed maize it was found
that:
(1) Small amounts of meatmeal and supplements of maize ranging
from 50 grams to approximately 150 grams per day favoured the growth of
the rumen organisms. Heavier supplements of maize, on the other hand,
tended to reduce the number of organisms in the rumen.
(2) The increase in the bacterial count did not improve the digestibility
of the cellulose in the winter grazing. A progressive depression in
its digestibility with increasing supplements of maize was, however,
observed.
(3) The rectification of the existing protein deficiency in winter grazing
with a minimum quantity of protein is futile unless its energy deficiency
is simultaneously satisfied.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format
The nutritive value of South African feeding stuffs. III. Digestible nutrients and metabolizable energy content of a mixture (1:1) of lucerne hay and yellow maize at different planes of intake for sheep
Mature Merino sheep were used as experimental subjects in a study of the
digestibility of a ration of equal parts by weight of lucerne hay and crushed
maize at three levels of nutrition, viz. maintenance, 1 ½ x maintenance and 2 x
maintenance. The data yielded the following conclusions:
(1) The digestibility of the dry matter was significantly decreased by 2•4
absolute per cent. when the maintenance ration was increased by 50 per cent.
Doubling the maintenance allowance had no further influence in this respect.
(2) The apparent digestibility of the protein decreased progressively as the
plane of nutrition was increased, the decrease over the whole range being
5•2 absolute per cent. This difference was statistically highly significant.
(3) The cellulose fraction behaved somewhat like the dry matter whilst
"other carbohydrates" (sugars, starch, and hemicelluloses) showed, with increase
in plane of nutrition, a progressive decrease in digestibility amounting to 2•9
absolute per cent. at the highest level of intake. This decrease was highly
significant statistically.
(4) The digestibility of the lignin fluctuated from 4•6 per cent. at the 1 ½ x
maintenance level to 13•4 per cent. at the 2 x maintenance level.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format