43 research outputs found
Anatomical studies No. 51. Hypermastia and hyperthelia in cattle
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The influence of rations low in certain minerals on the composition of the blood and milk of cows, and on the blood of their progeny
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Studies in native animal husbandry : 6. A note on Ovambo cattle
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Digestibility of lucerne hay with special reference to experimental technique in digestion trials (second report)
(1) In a continuation of the study of the digestibility of the same lucerne hay
by the same steers at different times further evidence of a period influence on
digestibility was obtained. This influence could be reduced or eliminated by
following a simplified technique in planning digestion trials with different feeding
stuffs.
(2) The digestion of lucerne hay by bovines would seem to improve with age
in these animals.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
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The effect of body stores and of method of supplementation on the efficiency of calcium and phosphorus utilization by sheep
(1) The Ca and P metabolism of two groups of young sheep, depleted of these
minerals, was investigated in a series of three balance studies.
(2) During the first 10 days on the bone meal supplemented ration, the
inorganic P of the blood rose sharply from approximately 2•0 to 5•0 mgm. per
100 c.c. of blood, a level which was more or less maintained to the end of the
experiment.
(3) Under the conditions obtaining the method of bone meal supplementation
had no influence on the efficiency of utilization of Ca and P. The implication
of this for the problem of phosphate feeding under practical conditions is briefly
discussed.
(4) Ca and P utilization dropped considerably in the course of the 80 days
on the enriched ration. Retention figures for Ca decreased from 22•5 to 12•7
per cent. and those for P from 53•1 to 32•2 per cent.
(5) Due to the fact that no observations are available on the extent of
replenishment during the period of bone meal feeding the final interpretations of
these results must await the outcome of further investigations.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
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Domsiekte or pregnancy disease in sheep. III
(1) It has been confirmed that a sudden and drastic reduction in diet
of fat ewes in the fourth month of pregnancy causes typical domsiekte or
pregnancy disease. The condition was evinced clinically, chemically and
pathologically.
(2) Similar treatment of fat, non-pregnant ewes caused the same changes
in blood chemistry as seen in pregnancy disease in some, and post-mortem
findings typical of the disease in others. No clinical symptoms were observed
in non-pregnant ewes.
(3) In the non-pregnant group no correlation could be found between
chemical changes, post-mortem findings and clinical symptoms.
(4) The non-pregnant ewes survived for a very much longer period than
the pregnant ewes.
(5) A hitherto undescribed pathological finding, namely hypertrophy of
the retico-endothelial system of the lymph nodes is recorded.
(6) Indications are given that the use of alkaline dosing has no effect
on the formation of acetonaemia.
(7) Treatment by means of rapidly active purgatives and sugars is
indicated.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
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The influence of processing on the efficiency of proteins
Employing an improved nitrogen balance method the influence of mild heat
treatment on the digestibility and biological value of a mixture of plant proteins
has been determined.
The heat treatment resulted in a small though significant improvement in
the digestibility of the proteins. Protein quality was, however, not affected.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
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Domsiekte or pregnancy disease in sheep. I. A review of the literature
The available literature is reviewed and where possible conclusions are drawn.
References are listed which deal either directly or indirectly with the question
of Pregnancy Disease of sheep.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
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The Onderstepoort small animal colony
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Studies in mineral metabolism XXXV. The role of iodine in the nutrition of sheep
When the daily ration of Merino ewes contained 0.05 gm. KI for a period of about twelve months no effects were observed in bodyweight and food consumption. Reproduction was, however, abnormal in all the groups receiving the KI supplement, the effects of which were more pronouncedly deleterious in sheep on a carotene low diet than when 200 grm. greenfeed were supplied daily. The response to increased protein feeding in the form of bloodmeal was marked by the detrimental effect of KI on reproduction. As all the rations can easily be improved both in quality and palatability it cannot be inferred that the quantity of KI given will affect reproduction in sheep adversely under ideal feeding conditions. The conclusion is justified, however, that when greenfeed is absent or inadequate as frequently happens in practice good quality protein is not available and the incorporation of KI in sheep licks is distinctly dangerous and may even cause losses due to abnormal reproduction.The articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
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