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Models of rumen sulphur metabolism in sheep

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Kandylis, Kostas (1981) Models of rumen sulphur metabolism in sheep. PhD thesis, University of Tasmania.

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Abstract

A preliminary investigation (Part III) was carried out to investigate
the losses of volatile sulphur compounds from sheep maintained on a
high sulphur ration (total N = 1.980% of dry matter, total S = 0.395%
of dry matter, N/S = 5/1), following intraruminal administration of
sodium [ 35 S] sulphate.
Sheep were fed their rations at one hourly intervals with urea and
inorganic sulphate being virtually the major sources of nitrogen and
sulphur respectively in order to establish steady-state conditions in
the rumen, that is constant rumen sulphide concentration and pH were
maintained under these conditions.
The first experiment (Part IV) was conducted with a low sulphur intake
(total N = 1.417% of dry matter, total S = 0.159% of dry matter, N/S =
8.9/1) in order to gain experience with modelling and test the proposed
model. For the same purpose the sheep received a high sulphur ration
(total N = 1.826% of dry matter, total S = 0.321% of dry matter, N/S =
5.7/1) in the second experiment (Part V).
Because of the anaerobic conditions predominant in the rumen, protein
synthesis is mainly limited by available energy. In the third (Part
VI) and fourth (Part VII) experiments the effect of energy intake on
microbial protein synthesis and absorption rate from the rumen was
studied. In the third experiment, the sheep were maintained on a high
sulphur. ration (total N = 1.753% of dry matter, total S = 0.312% of
dry matter, N/S = 5.6/1) and 15% of the oat hulls were replaced by
starch. In the fourth experiment, the sheep received a high sulphur
ration as previously (total N = 1.681% of dry matter, total S = 0.302%
of dry matter, N/S = 5.6/1) and 30% of the oat hulls were replaced by
starch.
During the course of these experiments, recent marker techniques were
used to study the flow of digesta and the sulphur flow rates from the
rumen.

Item Type: Thesis (PhD)
Keywords: Sulphur metabolism, Sheep, Rumen fermentation
Copyright Holders: The Author
Copyright Information:

Copyright 1981 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s)

Additional Information:

Thesis (Ph.D.)--University of Tasmania, 1981. Bibliography: l. 289-316

Date Deposited: 19 Dec 2014 02:24
Last Modified: 11 Mar 2016 05:56
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