Directory UMM :Data Elmu:jurnal:A:Animal Feed Science and Technology:Vol81.Issue1-2.Sep1999:
Animal Feed Science and Technology
81 (1999) 151±159
Short communication
A comparison of the predictions of digestible energy
content of compound feeds for pigs by
chemical or in vitro analysis
M. Spanghero*, L.A. Volpelli
Department of Animal Production Science, via S. Mauro 2, 33010 Pagnacco, Udine, Italy
Received 9 October 1998; received in revised form 23 February 1999; accepted 1 June 1999
Abstract
The comparison of the predictions of the digestible energy (DE) content of commercial
compound pig feeds from the organic matter in vitro digestibility (OMD) and five recent and
accurate multiple regression equations based on chemical components was examined. The OMD
was determined by submitting each sample (17 compound feeds for lactating or pregnant sows and
23 for piglets and growing±fattening pigs) to three sequential incubations with enzymatic solutions
in a closed system to simulate the gastric and pancreatic digestion and the degradation in the hind
gut (2, 4 and 18 h of incubation, respectively). OMD values were converted into energy digestibility
coefficients (dE), which together with gross energy (GE) content were used to calculate DE
(=GE*dE). Chemical components (ash, ether extract (EE), crude protein (CP), crude fibre (CF),
NDF and ADF) and GE content were used to predict the DE content using five multiple equations,
selected in terms of their accuracy (r2 and/or RSD).
The DE content was closely correlated with NDF (r, ÿ0.91, p
81 (1999) 151±159
Short communication
A comparison of the predictions of digestible energy
content of compound feeds for pigs by
chemical or in vitro analysis
M. Spanghero*, L.A. Volpelli
Department of Animal Production Science, via S. Mauro 2, 33010 Pagnacco, Udine, Italy
Received 9 October 1998; received in revised form 23 February 1999; accepted 1 June 1999
Abstract
The comparison of the predictions of the digestible energy (DE) content of commercial
compound pig feeds from the organic matter in vitro digestibility (OMD) and five recent and
accurate multiple regression equations based on chemical components was examined. The OMD
was determined by submitting each sample (17 compound feeds for lactating or pregnant sows and
23 for piglets and growing±fattening pigs) to three sequential incubations with enzymatic solutions
in a closed system to simulate the gastric and pancreatic digestion and the degradation in the hind
gut (2, 4 and 18 h of incubation, respectively). OMD values were converted into energy digestibility
coefficients (dE), which together with gross energy (GE) content were used to calculate DE
(=GE*dE). Chemical components (ash, ether extract (EE), crude protein (CP), crude fibre (CF),
NDF and ADF) and GE content were used to predict the DE content using five multiple equations,
selected in terms of their accuracy (r2 and/or RSD).
The DE content was closely correlated with NDF (r, ÿ0.91, p