title: Evaluation of the interrelationships among lactose and protein sources in diets for segregated early-weaned pigs.
abstract: We conducted two experiments to evaluate the interactions among lactose and protein sources in diets for segregated early-weaned pigs. In Exp. 1, 360 barrows (initially 5.3 kg and 19 +/- 2 d of age) were fed diets containing crystalline lactose (0, 20, and 40%), spray-dried animal plasma (0 and 7.5%), and soybean meal (0 and 20%) in a 3 x 2 x 2 factorial arrangement. We used a blend of select menhaden fish meal and casein to replace the lysine provided by soybean meal or animal plasma. Diets contained 1.7% total lysine and were fed from d 0 to 14 after weaning. Pigs were fed a common diet from d 14 to 34. From d 0 to 14 after weaning, ADG and ADFI increased with increasing dietary lactose when the diet contained soybean meal but decreased when soybean meal was not in the diet (lactose x soybean meal, P < .05 and .10, respectively). Pigs fed animal plasma had increased (P < .05) ADG and ADFI from d 0 to 14 but decreased (P < .05) ADG from d 14 to 34. In Exp. 2, 324 barrows (initially 3.7 kg and 10 +/- 2 d of age) were fed diets from d 0 to 10 similar to those used in Exp. 1 with the exception that extruded soy protein concentrate replaced the lysine provided by soybean meal or animal plasma. From d 0 to 10 after weaning, increasing lactose improved (linear, P < .05) ADG and ADFI, and pigs fed animal plasma had higher ADFI (P < .05). In conclusion, soybean meal had no negative effect on ADG; however, animal plasma and lactose increased ADG and ADFI for pigs weaned between 10 and 19 d of age.
authors.affiliation: Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-0201, USA.
authors.forename: W B
authors.initials: WB
authors.lastname: Nessmith
authors.forename: J L
authors.initials: JL
authors.lastname: Nelssen
authors.forename: M D
authors.initials: MD
authors.lastname: Tokach
authors.forename: R D
authors.initials: RD
authors.lastname: Goodband
authors.forename: J R
authors.initials: JR
authors.lastname: Bergström
authors.forename: S S
authors.initials: SS
authors.lastname: Dritz
authors.forename: B T
authors.initials: BT
authors.lastname: Richert
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D001798:Blood Proteins / Q000378:metabolism; D004032:Diet / Q000662:veterinary*; D004044:Dietary Proteins / Q000378:metabolism*; D007785:Lactose / Q000378:metabolism*; D008239:Lysine / Q000378:metabolism; D008297:Male; D011336:Probability; D011897:Random Allocation; D030262:Soybean Proteins / Q000378:metabolism; D013552:Swine / Q000254:growth & development / Q000378:metabolism*; D014886:Weaning
chemical_list: D001798:Blood Proteins; D004044:Dietary Proteins; D030262:Soybean Proteins; D007785:Lactose; D008239:Lysine