XII - 12th International Symposium - Digestive Physiology of Pigs

Digestive
Physiology
of Pigs
periods. This method enabled feces collection originating
from measured feed intake by coloring 2 meals identifying
the initiation and termination. The difference procedure was
used to calculate DE and ME in CM, PKM, and CR. The
apparent total tract digestibility of energy was 89.5, 84.1,
82.4, and 87.9% (SEM = 0.5; P < 0.001) in the basal, CM,
PKM, and CR diets, respectively. The DE in CM and PKM
were greater than in CR (3,440 and 3,238 vs. 2,966 kcal/
kg on an as-fed basis; P < 0.05). The DE:GE in CM and
CR were greater than in PKM (81.3 and 83.4 vs. 72.5%; P
< 0.05). The ME in CM was greater than in CR (3,340 vs.
2,935 kcal/kg on an as-fed basis; P < 0.05), but not different
from the ME in PKM (3,168 kcal/kg). In conclusion, CM and
PKM have a higher DE value than CR, and CM has a higher
ME value than CR.
Key words: copra meal, palm kernel meal, cassava root
1067 Comparison of standardized ileal amino acid
digestibilities in protein supplements and cereal grains
for weaned pigs. N. Sauer* 1 , M. Eklund 1 , S. Hoerner 1 , M.
Rademacher 2 , and R. Mosenthin 1 , 1 Institute of Animal Nutrition,
University of Hohenheim, Stuttgart, Germany, 2 Evonik
Industries, Health and Nutrition feed additives, Hanau–
Wolfgang, Germany.
Standardized ileal digestibilities (SID) of AA in protein
ingredients and grains were determined in weaned piglets
(5 kg initial BW), using the difference method. Animals were
fitted with a simple ileal T-cannula on d 24 or 25 of age. A
synthetic diet based on cornstarch and casein was either
supplemented with an extruded soybean meal (ESM, 467
g CP/kg DM), rice protein concentrate (RPC, 717 g CP/kg
DM), full fat heat treated soybeans (SB, 412 g CP/kg DM),
corn (87 g CP/kg DM), barley (125 g CP/kg DM) or wheat
(143 g CP/kg DM). The contribution of CP and AA from
casein and from the assay feed ingredients to the assay
diet averaged 50% for each. Each diet was fed to 6 animals
according to a row-column design with 3 periods. Apparent
ileal digestibility were corrected for basal ileal endogenous
losses of AA (literature values) and transformed into
SID values. The SID of indispensable AA in the protein
ingredients ranged from 50 to 73% for Thr to 57–85% for
Lys (Table). Between RPC and soy products, differences (P
< 0.05) in SID of Lys, Met and Thr were greater than within
soy products (ESM, SB). The SID of Lys, Thr, and Trp did
not differ (P > 0.05) between barley and wheat, whereas
SID of Met was lowest (P < 0.05) in barley. In conclusion,
the use of RPC, despite its high CP content, in diets for
weaned piglets is limited, due to its low SID of Lys and Met
compared with the soy products (ESM, SB).
Table 1. Standardized ileal digestibility of amino acids in
the assay feedstuffs (LSMeans± SEM; %)
Item ESM SB RPC
Feedstuffs
Corn Barley Wheat P-value
n1 5 6 6 6 5 5
Lys 85a ± 6.6 77ab ± 6.0 57c ± 6.0 49c ± 6.0 64bc ± 6.6 63bc ± 6.6 0.004
Met 85a ± 2.9 72b ± 2.6 51d ± 2.6 71b ± 2.6 60c ± 2.9 76ab ± 2.9 0.05). Feed efficiency was lower
in NC pigs (0.308 kg/kg, P < 0.05) than in pigs fed the PC
(0.328 kg/kg) or the phytase diets with 250 or 500 FTU/kg
(0.324 and 0.330 kg/kg, respectively). Fecal P digestibility
in both sampling periods was lowest in pigs fed NC diets
(35.5% in starter and 32.2% in grower period). Phytase
improved P digestibility in both periods at both application
rates with 500 FTU/kg diet being superior to 250 FTU/kg
(P < 0.05) and on the same level or above the PC pigs
(40.1% in starter and 43.7% in grower period). Similar but
less pronounced effects were evaluated for Ca digestibility.
Addition of the phytase tested allows relevant P and Ca
reduction in diets by nearly restoring performance to the
level of pigs fed diets with adequate P and Ca level and by
improving P and Ca digestibility of low P diets.
Key words: phytase, pig, digestibility
1069 Effects of β-hydroxy β-methyl butyrate supplementation
to sows in late gestation on absorption and
hepatic metabolism of glucose and amino acids during
transition. C. Flummer* 1 , H. Lyby 2 , K. S. Storli 2 , V. Bjerre-
Harpøth 1 , B. M. Nielsen 3 , M. Krämer 1 , B. A. Røjen 1 , N. B.
Kristensen 1,4 , and P. K. Theil 1 , 1 Department of Animal Science,
Aarhus University, Tjele, Denmark, 2 Department of