title: Effect of feed intake level on ileal digestibilities of crude protein and amino acids in diets for piglets.
abstract: BACKGROUND
  The study was conducted to determine the effect of graded levels of feed intake on apparent (AID) and standardized (SID) ileal digestibilities of crude protein (CP) and amino acids (AA) in diets for piglets. The piglets were surgically fitted with simple T-cannulas at the distal ileum. The cornstarch-casein-soybean meal-based diets were fed at three graded levels of feed intake corresponding to 30, 45 and 60 g kg(-1) body weight (BW) per day.
  
  
  RESULTS
  The AID and SID of most AA were quadratically affected by the feed intake level (P≤0.05). Initially, both AID and SID of most AA increased up to 1.9 percentage units as the feed intake level was increased from 30 to 45 g kg(-1) BW. Thereafter, these AID and SID values decreased by 2.6 and 2.7 percentage units, respectively, as the feed intake level was further increased from 45 to 60 g kg(-1) BW.
  
  
  CONCLUSIONS
  Because the voluntary feed intake is highly variable in piglets after weaning, comparison of ileal AA digestibilities between and within studies may be confounded by variations in feed intake level. Thus, when designing digestibility studies with piglets, a standardization of feed intake should be taken into consideration.
authors.affiliation: Institute of Animal Nutrition, University of Hohenheim, 70593 Stuttgart, Germany.
authors.forename: Miriam
authors.initials: M
authors.lastname: Goerke
authors.forename: Meike
authors.initials: M
authors.lastname: Eklund
authors.forename: Nadja
authors.initials: N
authors.lastname: Sauer
authors.forename: Meike
authors.initials: M
authors.lastname: Rademacher
authors.forename: Hans-Peter
authors.initials: HP
authors.lastname: Piepho
authors.forename: Christiane
authors.initials: C
authors.lastname: Börner
authors.forename: Rainer
authors.initials: R
authors.lastname: Mosenthin
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D002364:Caseins; D004032:Diet; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion; D002149:Energy Intake; D007082:Ileum / Q000378:metabolism*; D012015:Reference Standards; D012107:Research Design; D013025:Glycine max; D034421:Sus scrofa; D003313:Zea mays
chemical_list: D000596:Amino Acids; D002364:Caseins; D004044:Dietary Proteins