Identifier

etd-10272011-063500

Degree

Doctor of Philosophy (PhD)

Department

Animal Science (Animal, Dairy, and Poultry Sciences)

Document Type

Dissertation

Abstract

The objectives of this research were to: 1) evaluate the role of Gly in low CP, AA supplemented diets for broilers, 2) determine subsequent effects of supplementing Gly in broiler diets, and 3) determine the Val and Ile requirement in an AA supplemented, C-SBM diet for 20- to 45-kg pigs. Three experiments were conducted to evaluate supplementation of Gly, creatine, GAA, and fishmeal in C-SBM diets on growth performance of broiler chicks and to determine if Gly, creatine, or GAA could be added to a C-SBM diet in place of fishmeal to produce similar growth performance. The results from these experiments indicate that supplemental Gly, creatine, or GAA can be supplemented in a C-SBM diet in replacement of fishmeal and produce similar growth performance to broilers fed a C-SBM, fishmeal diet. Two experiments were conducted to determine the effects of supplementing Lys and Gly and effects of feeding 2 dietary Lys levels without and with supplemental Gly and antibiotics on growth performance, serum uric acid, and intestinal and organ responses of broilers. Results from these experiments indicate that increasing dietary Lys in diets for broilers increases growth performance and supplementation of Gly in low CP, AA supplemented diets increases feed efficiency. Thus, this improvement in G:F coincides with an increase in serum uric acid and occurs in diets that are high (1.40%) or low (1.26%) in dietary Lys. The increase in G:F is not similar to the feed efficiency response seen when antibiotics are supplemented in broiler diets. An experiment was conducted to determine the effect of feeding increasing levels of supplemental Lys without and with supplemental Gly from 0- to 10-d and the subsequent effects of feeding these diets from 10- to 24-d. Results from these experiments indicate that the inclusion of up to 0.15% supplemental Lys can be added in a C-SBM diet without or with supplemental Gly without reducing growth performance of 0- to 10-d old broilers. These results also indicated that providing Gly in the starter phase (0- to 10-d) increased G:F during the subsequent grower phase depending on the supplemental Lys level that was provided in the starter phase. Three experiments were conducted to determine the Val and Ile requirement in an AA supplemented, C-SBM diet for 20- to 45-kg pigs. The Val and Ile requirement for 20- to 45-kg pigs in an AA-supplemented, C-SBM diet is 0.56 to 0.58% SID Val (0.67 to 0.70 SID Val:Lys) and 0.43% SID Ile (0.52 SID Ile:Lys).

Date

2011

Document Availability at the Time of Submission

Secure the entire work for patent and/or proprietary purposes for a period of one year. Student has submitted appropriate documentation which states: During this period the copyright owner also agrees not to exercise her/his ownership rights, including public use in works, without prior authorization from LSU. At the end of the one year period, either we or LSU may request an automatic extension for one additional year. At the end of the one year secure period (or its extension, if such is requested), the work will be released for access worldwide.

Committee Chair

Southern, Lee L.

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