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Live weight loss and its components in Romney ewes subjected to L-thyroxine therapy and a low plane of nutrition. Part II. Effects on some non-carcass components of live weight

Published online by Cambridge University Press:  27 March 2009

A. H. Kirton  and
R. A. Barton
A. H. Kirton
Affiliation:
Sheep Husbandry Department, Massey Agricultural College, Palmerston North, New Zealand
R. A. Barton
Affiliation:
Sheep Husbandry Department, Massey Agricultural College, Palmerston North, New Zealand
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Extract

1. The effects of l-thyroxine therapy and a low plane of nutrition on some of the non-carcass components of live weight in New Zealand Romney ewes were investigated.

2. Thyroxine treatment significantly lowered the weight of the gastrointestinal tract contents. A low plane of nutrition and a longer total starvation immediately pre-slaughter had little effect in lowering the weight of the gastrointestinal contents. Alimentary tract ‘fill’ accounted for a group mean loss of live weight of up to 5 lb.

3. Thyroxine treatment lowered the weight of the empty gastric tract, while a low plane of nutrition reduced the weight of both the empty gastric and intestinal tracts. The combined treatment effects accounted for a loss of up to 3 lb. in the weight of the empty gastrointestinal tract.

4. Neither treatment significantly reduced the weight of the omental and mesenteric fat depots.

5. The weight of the thyroid gland was unaffected by either treatment.

6. A low plane of nutrition significantly reduced the weight of the liver, kidneys and the heart but had no effect on the weight of the spleen. Thyroxine therapy significantly reduced the weight of the liver and tended to increase the weight of the kidneys and the heart.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 51 , Issue 3 , December 1958 , pp. 282 - 288
Copyright
Copyright © Cambridge University Press 1958

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References

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