XII - 12th International Symposium - Digestive Physiology of Pigs

Digestive
Physiology
of Pigs
SBM to 87% for Glu in US2, Brazilian and Argentinean
SBM. The experimental period affected SID of His, Ile and
most dispensable AA, with lower SID values in period 1
compared with period 2 (P < 0.05), but SID values did not
differ between the SBM batches (P = 0.136 for His to P =
0.975 for Glu). In conclusion, European SBM imports from
Brazil, Argentina or the United States were similar in their
chemical composition, and for most AA high and uniform
SID values, independent from their source of origin, were
obtained.
Key words: standardized ileal digestibility, soybean meal,
piglet
1097 Comparative evaluation of standardized ileal
amino acid digestibilities in protein supplements for
piglets. M. Eklund* 1 , N. Sauer 1 , S. Hörner 1 , M. Rademacher
2 , and R. Mosenthin 1 , 1 Institute of Animal Nutrition,
Universtiy of Hohenheim, 70593 Stuttgart, Germany,
2 Evonik Industries AG, 63457 Hanau-Wolfgang, Germany.
The study was conducted to determine standardized ileal
digestibilities (SID) of CP and AA in protein ingredients
frequently used in piglet nutrition. Twelve piglets were
removed from the sow at 19 d of age (6 kg initial BW), and
were fitted with a simple ileal T-cannula between d 22 and
23 of age. A semi-synthetic diet based on cornstarch and
casein was either supplemented with soy protein concentrate
(SPC), soy protein (SP), fermented soybeans (FSB),
fullfat soybeans (FFSB), fluid-bed dried porcine intestinal
mucosa hydrolysate (FDPIMH) or spray-dried porcine
intestinal mucosa hydrolysate (SDPIMH). The contribution
of CP and AA from casein and from each of the assay feed
ingredients to the assay diet averaged approximately 50%.
Each diet was fed to 6 animals according to a row-column
design with 3 experimental periods. The SID of CP and AA
were calculated by means of the difference method. The
experimental period affected SID of CP and AA, with lower
SID values in period 1 compared with periods 2 and 3 (P
< 0.05). The SID of indispensable AA in the soy products
ranged from 72% for Thr in FFSB to 92% for Arg in FSB and
in SPC. The SID of CP and AA did not differ between SPC,
SP, FSB and FFSB (P > 0.05). The SID of indispensable AA
in the intestinal mucosa hydrolysates ranged from 53% for
His in SDPIMH to 83% for Arg in DIMH. The SID of most
AA did not differ between FDPIMH and SDPIMH (P > 0.05)
except for SID of Arg, His, Asp, Glu and Ser which were
up to 19 percentage units higher and SID of Gly which
was 17 percentage units lower in SDPIMH compared with
FDPIMH (P < 0.05). Compared with most SID values in the
soy products, SID of CP and indispensable AA were up to
19 percentage units lower in FDPIMH and SDPIMH (P <
0.05). In conclusion, high and uniform SID values in the soy
products indicate that the different processing procedures
used to manufacture these products were efficient to
inactivate antinutritional factors present in raw soybeans.
For most AA in the porcine intestinal mucosa products,
drying procedure did not affect SID of AA, but SID values
were generally lower compared with the soy products.
Key words: standardized ileal digestibility, amino acids,
piglets
XII INTERNATIONAL SYMPOSIUM ON
DIGESTIVE PHYSIOLOGY OF PIGS
76
Session II
1098 endogenous losses and true ileal digestibility
of amino acids in piglets as influenced by feed and
protein intake. M. Eklund* 1 , N. Sauer 1 , D. Jezierny 1 , M.
Goerke 1 , M. Rademacher 2 , and R. Mosenthin 1 , 1 Institute of
Animal Nutrition, University of Hohenheim, 70593 Stuttgart,
Germany, 2 Evonik Industries AG, 63457 Hanau-Wolfgang,
Germany.
There is evidence that with increasing protein and feed
intake, ileal AA digestibilities in diets for pigs decline. This
reduction may be either due to reduced true ileal digestibility
(TID) and (or) increased endogenous AA secretion
(IAAend). Therefore, the homoarginine method was used
in the present study with piglets fed soybean meal (SBM)
or casein (CAS) to determine the effect of varying feed
and protein intake on TID and IAAend. A total of 51 piglets
(weaned at 17 d of age, 6 kg initial BW), fitted with ileal
T-cannulas, were used in 4 consecutive experiments with
2 periods each. The 12 cornstarch-based diets contained
6 levels of SBM or CAS (85; 135; 185; 235; 285; 335 g
CP/kg, as-fed). Half of the CP source was replaced by
the corresponding guanidinated CP source. Each diet
was fed at 2 levels of feed intake (30; 60 g/kg BW; in
total n = 4 piglets per treatment). Each period included 9
d for adaptation to the diets. Ileal digesta were collected
continuously for 12 h on d 10. Using the example of Lys,
the TID (P < 0.05) but not IAAend (P > 0.05) decreased
with increasing feed intake. Moreover, TID of Lys (P < 0.05)
declined and IAAend increased (P < 0.05) with higher CP
content sourced from SBM, whereas differences in CP
intake sourced from CAS did not affect (P > 0.05) IAAend
and TID of Lys. In conclusion, protein and feed intake can
affect ileal AA digestibility measurements as influenced by
the source of protein.
Table 1. Effect of protein source (PS) and feeding level
(FL, g/kg as-is) on IAA end and TID of Lys
Protein level (PL; g/kg as-is) P-value
PS FL 85 135 185 235 285 335 PS PL FL PSxPL
IAA CAS 60 end,
0.6 0.7 0.7 0.7 1.1 1.5