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The nutrition of the early-weaned calf. X. The effect of replacement of fish meal with either urea or ammonium acetate on growth rate and nitrogen retention in calves fed ad libitum

Published online by Cambridge University Press:  02 September 2010

M. Kay ,
N. A. MacLeod ,
G. McKiddie  and
Euphemia B. Philip
M. Kay
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
N. A. MacLeod
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
G. McKiddie
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
Euphemia B. Philip
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen
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Extract

1. A growth trial and nitrogen balance studies were carried out on 32 early-weaned calves fed on a basal diet containing fish meal or diets in which the fish meal nitrogen was partially replaced by urea or ammonium acetate or totally replaced by urea.

2. Growth rate and feed conversion efficiency were highest on the fish meal diet and fell as urea replaced the fish meal.

3. Rumen ammonia levels and urinary nitrogen excretion were highest, and nitrogen retention lowest, in the calves receiving the diet in which fish meal nitrogen was completely replaced by urea nitrogen.

Type
Research Article
Information
Animal Production , Volume 9 , Issue 2 , May 1967 , pp. 197 - 201
Copyright
Copyright © British Society of Animal Science 1967

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References

REFERENCES

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