Measuring suitability of soybean products for early-weaned pigs with immunological criteria.
Two trials were conducted to determine the suitability of soybean products for baby pigs. Weanling pigs (n = 40 and 48 in Trials 1 and 2, respectively) were infused orally (6 g/d) with dried skim milk, soybean meal (SBM, 48% CP); soy protein concentrate, moist extruded soy protein concentrate, or soy protein isolate from d 7 to 12 of age. Pigs were then fed a diet containing the same protein source for 1 (Trial 1) or 2 (Trial 2) wk after weaning (d 21 of age). To avoid exposure of pigs to soybean proteins, the dams of pigs were fed a corn-corn gluten meal-based diet supplemented with lysine and tryptophan from d 109 of gestation. All pigs in Trial 1 were killed at 28 d of age, and samples of ileal digesta and small intestine were obtained. In Trial 2, the soy protein isolate was not included, and all pigs were fed a diet containing 4% soybean oil and 1.25% lysine for the last 3 wk of the trial. Growth performance, skin-fold thickness, after intradermal injection of extracts of the corresponding proteins, and anti-soy immunoglobulin G (IgG) titers were measured. Results indicated that pigs fed diets containing SBM had lower (P less than .05) villus height and xylose absorption but higher (P less than .05) serum anti-soy IgG titers and increased skin-fold thickness compared with the mean of pigs given milk and all other soy treatments.(ABSTRACT TRUNCATED AT 250 WORDS)
Li
D F
DF
Kansas State University, Manhattan 66506.
Nelssen
J L
JL
Reddy
P G
PG
Blecha
F
F
Klemm
R D
RD
Giesting
D W
DW
Hancock
J D
JD
Allee
G L
GL
Goodband
R D
RD
D000821:Animal Feed; D000818:Animals; D004063:Digestion; D004386:Duodenum / Q000033:anatomy & histology / Q000648:ultrastructure; D007074:Immunoglobulin G / Q000032:analysis; D007428:Intradermal Tests; D008871:Microvilli / Q000648:ultrastructure; D014674:Plant Proteins, Dietary / Q000276:immunology; D011897:Random Allocation; D012885:Skinfold Thickness; D013024:Soybean Oil; D030262:Soybean Proteins; D013025:Glycine max; D013552:Swine / Q000254:growth & development / Q000276:immunology*; D015430:Weight Gain; D014994:Xylose / Q000097:blood
D007074:Immunoglobulin G; D014674:Plant Proteins, Dietary; D030262:Soybean Proteins; D013024:Soybean Oil; D014994:Xylose