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Ammonium salts of fatty acids for milk production 1. The effect of feeding a salt solution containing ammonium acetate on the yield and composition of milk produced by Jersey cows fed hay/concentrate diets

Published online by Cambridge University Press:  02 September 2010

J. H. D. Prescott ,
A. S. El-Shobokshy  and
D. G. Armstrong
J. H. D. Prescott
Affiliation:
School of Agriculture, The University, Newcastle upon Tyne
A. S. El-Shobokshy
Affiliation:
School of Agriculture, The University, Newcastle upon Tyne
D. G. Armstrong
Affiliation:
School of Agriculture, The University, Newcastle upon Tyne
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Summary

1. Two experiments have been carried out to study the nutritive value of dilute solutions of fatty acids (consisting mainly of ammonium acetate) when incorporated in the diet of lactating Jersey cows.

The first, a continuous trial, extended over a total of 17 weeks and involved five pairs of cows. One cow in each pair received the treatment and one the control diet. The second trial, of change-over design, involved four pairs of cows; one cow in each pair received one or other of the experimental diets alternately over four 28-day periods.

2. The cows received basic diets comprising hay ad libitum and concentrates regulated according to milk yield. On the control treatment cows received water and a concentrate containing an appropriate percentage of groundnut cake; on treatment cows received a dilute solution of salts and an ‘all-cereal’ concentrate. The treatment provided cows with approximately 30% of their total DCP intake as ammonia-N and with 270 to 310 g of acetate and 43 to 49 g of propionate/day from the salt solution.

3. Solutions of salts have been offered to the cows at various concentrations in the range 0·25 to 2·6% (w/v) as a substitute for drinking water. Nineteen of the 20 cows consumed solutions of 1·4% concentration in normal quantities equivalent to water.

4. Treatment was associated with an appreciable depression in the yield of cows producing 13 to 14 kg of milk per head/day, but had little effect on the yield of cows producing 10 to U kg or less. This result has been discussed with reference to the role of the ammonia-N as a substitute for protein-N.

5. Treatment significantly increased the fat content of the milk produced by these Jersey cows above the high control level of 5·4%. Total milk fat production was also increased. This result has been discussed with reference to the role of acetate in dairy cow diets.

Type
Research Article
Information
Animal Production , Volume 11 , Issue 2 , May 1969 , pp. 195 - 207
Copyright
Copyright © British Society of Animal Science 1969

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References

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