Irish Journal of Agricultural & Food Research >
IJAFR, volume 44, 2005 >
Please use this identifier to cite or link to this item:
|Title: ||The application of low crude protein wheat-soyabean diets to growing and finishing pigs: 2. The effects on nutrient digestibility, nitrogen excretion, faecal volatile fatty acid concentration and ammonia emission from boars|
|Authors: ||Leek, A. B. G.|
Henry, R. W.
Low crude protein
Volatile fatty acids
|Issue Date: ||2005|
|Publisher: ||Teagasc (Agriculture and Food Development Authority), Ireland|
|Citation: ||A.B.G. Leek, J.J. Callan, R.W. Henry and J.V. O’Doherty. The application of low crude protein wheat-soyabean diets to growing and finishing pigs: 2. The effects on nutrient digestibility, nitrogen excretion, faecal volatile fatty acid concentration and ammonia emission from boars. Irish Journal of Agricultural and Food Research 44: 247–260, 2005|
|Series/Report no.: ||Irish Journal of Agricultural and Food Research;vol 44|
|Abstract: ||Diets containing 132, 152, 183 and 206 g/kg crude protein (CP) were fed to growing and
finishing boars to evaluate the effect on nutrient digestibility, N balance, faecal volatile
fatty acids (VFA) and ammonia-N (NH3–N) emission. Dietary CP concentration was
adjusted by altering the ratio of wheat:soyabean meal. Lysine, threonine, tryptophan
and total sulphur-containing amino acids were included in all diets at concentrations
equivalent to that in the highest CP diet. All diets were formulated to provide 9.7 MJ/kg
of net energy. Urine and faeces were collected from 16 boars (4 boars per treatment)
housed in metabolism crates. Collections were performed at 72, 80 and 87 kg live weight.
NH3–N emission was measured over 10 days using a laboratory scale procedure.
Reducing the concentration of dietary CP decreased N intake (linear, P < 0.01), the
excretion of urinary N, ammoniacal N and total N (linear, P < 0.001; cubic, P < 0.001)
and the emission of NH3–N (linear, P < 0.001; cubic, P < 0.01). Total N excretion and
NH3–N emission decreased 8.7% and 10.1% per 10 g/kg reduction in dietary CP
concentration between 205.6 and 131.9 g/kg, respectively. There was no interaction
between dietary CP concentration and collection period. N balance differed between the collection periods and less NH3–N was emitted at 87 kg than at 72 kg. Decreasing
dietary CP reduced faecal VFA concentration (linear, P < 0.05) and the molar proportions
of acetic and butyric acids (quadratic, P < 0.01).|
This study received financial support from Telltech Ltd. (Wicklow, Ireland) and Enterprise Ireland (Dublin, Ireland).
|Appears in Collections:||IJAFR, volume 44, 2005|
Items in T-Stor are protected by copyright, with all rights reserved, unless otherwise indicated.