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Experiments on the nutrition of the dairy heifer: VII. Observations on the effect of the energy intake on the utilization of protein in growth and in lactation

Published online by Cambridge University Press:  27 March 2009

W. H. Broster ,
Valerie J. Tuck ,
T. Smith  and
V. W. Johnson
W. H. Broster
Affiliation:
National Institute for Research in Dairying, University of Reading
Valerie J. Tuck
Affiliation:
National Institute for Research in Dairying, University of Reading
T. Smith
Affiliation:
National Institute for Research in Dairying, University of Reading
V. W. Johnson
Affiliation:
National Institute for Research in Dairying, University of Reading
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Summary

Eight feeding trials on cattle showed that the response in live-weight gain was curvilinear when protein or energy level was varied independently in rations based on poor quality roughages to which cereals and groundnut were variously added to give a range of protein and energy intakes. Live-weight gain was increased by 0·12 lb/day for each 0·1 lb additional digestible crude protein/day at levels of intake below 0·7 lb/day and by 0·03 lb/day at higher levels. It was increased by 0·4 lb/day for each additional 0·1 lb starch equivalent daily/100 lb live weight at total intakes below 0·9 lb daily/ 100 lb and by 0·2 lb/day at higher levels. Over the range 0·5–2·0 lb digestible crude protein daily and 0·7–1·2 lb starch equivalent daily/100 lb live weight the effects of these nutrients were additive.

A Latin square nitrogen balance trial demonstrated that a portion of the nitrogen from a protein supplement was retained in the body despite the excretion of the greater part of it in the urine and a further part in the faeces. Nitrogen retention was increased by a supplement of readily available energy through a decrease in urinary nitrogen loss. Nitrogen balance was not increased by a supplement of a fibrous energy source because this induced an increase in faecal nitrogen loss.

In a further feeding trial milk yield was found to be affected in a similar manner to growth. At a yield of 30 lb/day the response per lb starch equivalent added to the diet was 0·5 lb milk including 0·05 lb solids not fat and to an increase of 0·1 lb digestible crude protein daily it was 0·25 lb milk including 0·025 lb solids not fat.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 72 , Issue 1 , January 1969 , pp. 13 - 30
Copyright
Copyright © Cambridge University Press 1969

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