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The effect of offering diets with a reduced crude protein and digestible energy content on the retention and excretion of nitrogen by pigs

Published online by Cambridge University Press:  05 November 2021

P.A. Lee  and
R.M. Kay
P.A. Lee
Affiliation:
ADAS Terrington, Terrington St Clement, King's Lynn, Norfolk PE34 4PW, United Kingdom
R.M. Kay
Affiliation:
ADAS Terrington, Terrington St Clement, King's Lynn, Norfolk PE34 4PW, United Kingdom
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Extract

Manipulation of dietary nitrogen content can reduce nitrogen excretion (NE) by the pig by 40 per cent (Kay and Lee, 1995), which has major implications for pollution legislation. Past work (Kay and Lee, 1996) has shown that whilst reduced crude protein (CP) diets reduce NE whilst maintaining nitrogen retention (NR), there is also an increase in backfat depth at slaughter. This suggests an ‘energy sparing’ effect from the lower levels of excess amino acids which might be exploited to lower the cost of the reduced CP diets. The objective of this experiment was to determine the NR and NE of growing and finishing pigs offered diets with reduced CP and Digestible Energy (DE) contents compared with commercial diets or diets with reduced CP content only.

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Programme
Information
Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 33
Copyright
Copyright © The British Society of Animal Science 1998

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References

Kay, R.M and Lee, P.A. 1995. Least cost diets to reduce nitrogen excretion by growing and finishing pigs. Animal Science, 60: 519 (Abstr.).Google Scholar
Kay, R.M. and Lee, P.A.. 1996. The performance of growing and finishing pigs offered diets formulated to reduce nitrogen excretion. Animal Science 62: 635 (Abstr).Google Scholar