Identifier

etd-11052010-190841

Degree

Doctor of Philosophy (PhD)

Department

Animal Science (Animal, Dairy, and Poultry Sciences)

Document Type

Dissertation

Abstract

The objectives of this research were 1) to determine the effect of replacing dried whey (DW) with milk chocolate product (MCP), dried whey permeate (DWP) with candy oats (CO), and spray-dried plasma protein (SDPP) with a novel swine nutritional supplement (SNS) on growth performance of weanling pigs, and 2) to determine the maximum level of supplemental L-Lys, along with DL-Met, L-Thr, and L-Trp that can be added in diets for 6- to 12 and 13- to 23-kg pigs. Three experiments were conducted to compare the feeding value of MCP (20% lactose and 60% sugars) and DW (70% lactose). Results from these experiments indicate that partial or total replacement of DW with MCP did not affect wk-1 feed intake or growth performance of weanling pigs. A similar experiment was conducted to compare the feeding value of CO (60% total sugars and 25% cooked oat-based cereals) and DWP (80% lactose). Results from this experiment indicate that a combination of DWP and CO increased wk-1 feed intake and growth performance of weanling pigs. Thus, MCP or CO could be considered as a formulation alternative to DW or DWP, respectively. Two experiments were conducted to determine the effect of replacing SDPP with SNS (concentrated plasma fraction). Results from these experiments indicate that the inclusion of SDPP or its replacement with SNS did not affect growth performance of weanling pigs. Eight experiments were conducted to determine the maximum level of supplemental L-Lys, along with DL-Met, L-Thr, and L-Trp that can be added in diets for 6- to 12-kg and 13- to 23-kg pigs without negatively affecting growth performance. Results from these experiments indicate that supplemental L-Lys levels of 0.198 and 0.298% or 0.331 and 0.423% can be added in diets for 6- to 12 or 13- to 23-kg pigs without negatively affecting G:F or ADG, respectively. The optimum SID Ile:Lys may not be greater than 0.55 in diets for 6- to 12-kg pigs containing low levels of red blood cells. The optimum SID Ile:Lys and SID Val:Lys may not be greater than 0.56 or 0.62, respectively, in corn-SBM diets for 13- to 23-kg pigs.

Date

2010

Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Southern, Lee

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