| DEDICATION | 第1-8页 |
| ACKNOWLEDGMENTS | 第8-13页 |
| LIST OF TABLES | 第13-14页 |
| LIST OF FIGURES | 第14-15页 |
| ABBREVIATIONS LIST | 第15-17页 |
| ABSTRACT | 第17-20页 |
| Ⅰ INTRODUCTION | 第20-22页 |
| Ⅱ REVIEW OF LITERATUR | 第22-35页 |
| 1. The relationship between heat stress and laying performance, blood parameters, lipidperoxidation, the immune function, and gut function: | 第22-29页 |
| ·Effects of High Temperatures on Laying Performance | 第22-23页 |
| ·Effects of High Temperatures on Egg Quality | 第23-24页 |
| ·The Relationship between Heat Stress and Blood Parameters | 第24-26页 |
| ·The Relationship between Heat Stress and the Lipid Peroxidation | 第26-27页 |
| ·The Relationship between Heat Stress and immune function | 第27-28页 |
| ·The Relationship between Heat Stress and gut function | 第28-29页 |
| 2. Dietary L-Threonine | 第29-35页 |
| ·Biochemical Aspects of Threonine | 第29-31页 |
| ·Threonine Requirement of laying hens | 第31-32页 |
| ·Effects of L-threonine on Laying Performance and Egg quality | 第32-33页 |
| ·Effects of L-threonine on Immunity | 第33-34页 |
| ·Effects of L-threonine on gut Function | 第34-35页 |
| Ⅲ Effect of supplemental L-threonine on laying performance, egg quality, and serum free amino acids oflaying hens under high-temperature and high-humidity environmental climates | 第35-59页 |
| 1. BSTRACT | 第35-36页 |
| 2. NTRODUCTION | 第36-38页 |
| 3. MATERIALS AND METHODS | 第38-41页 |
| ·Housing and Birds | 第38页 |
| ·Diets | 第38-39页 |
| ·Laying performance | 第39页 |
| ·Egg quality | 第39页 |
| ·Blood sampling and laboratory analyses | 第39-40页 |
| ·Statistical analyses | 第40-41页 |
| 4. RESULTS | 第41-43页 |
| ·Laying performance and Egg quality | 第41页 |
| ·Blood parameters | 第41-43页 |
| 5. DISCUSSION | 第43-59页 |
| ·Egg production | 第43-44页 |
| ·Feed intake | 第44-45页 |
| ·Egg weight | 第45-47页 |
| ·Feed conversion ratio | 第47页 |
| ·Egg quality | 第47-48页 |
| ·Blood parameters | 第48-59页 |
| Ⅳ Effect of supplemental L-threonine on immunity, goblet cells numbers, histological structure, andantioxidant enzyme activities of laying hens reared under hot and humid climates | 第59-77页 |
| 1. ABSTRACT | 第59-60页 |
| 2. INTRODUCTION | 第60-62页 |
| 3. MATERIALS AND METHODS | 第62-65页 |
| ·Sampling and Sample Processing Procedure | 第62页 |
| ·Assay of immune indices in Serum | 第62页 |
| ·Assay of Antioxidant Indices in Serum and Liver | 第62-63页 |
| ·Alkaline phosphatase estimation | 第63-64页 |
| ·Histological Structure | 第64页 |
| ·Statistical Analyses | 第64-65页 |
| 4. RESULTS | 第65-66页 |
| ·Serum antibodies and complements 3 & 4 | 第65页 |
| ·Goblet cells, gut histology, and the activity of α- alkaline phosphatase | 第65页 |
| ·Antioxidant enzyme activities and serum biochemical parameters | 第65-66页 |
| 5. DISCUSSION | 第66-77页 |
| ·Serum antibodies and complements 3 & 4 | 第66-67页 |
| ·Goblet cells, gut histology, and the activity of α- alkaline phosphatase | 第67-68页 |
| ·Antioxidant enzyme activities and serum biochemical parameters | 第68-77页 |
| Ⅴ Effect of supplemental 1-threonine on mucin 2 gene expression and intestine mucosal immune and digestiveenzymes activities of laying hens in environments with high temperature and humidity | 第77-91页 |
| 1. ABSTRACT | 第77-78页 |
| 2. INTRODUCTION | 第78-80页 |
| 3. MATERIALS AND METHODS | 第80-83页 |
| ·Digestive Enzyme Estimation | 第80页 |
| ·Determination of Antibodies Production in Intestine | 第80-81页 |
| ·MUC2 mRNA Expression Assay in Intestine | 第81-82页 |
| ·Statistical Analyses | 第82-83页 |
| 4. RESULTS | 第83-84页 |
| ·MUC2 mRNA Expression | 第83页 |
| ·Total Antibodies Production in Intestine | 第83页 |
| ·The Activities of Digestive enzymes | 第83-84页 |
| 5. DISCUSSION | 第84-91页 |
| ·MUC2 mRNA Expression | 第84-85页 |
| ·Total Antibodies Production in Intestine | 第85页 |
| ·The Activities of Digestive Enzymes | 第85-91页 |
| Ⅵ CONCLUSIONS & APPLICATIONS | 第91-93页 |
| INNOVATION | 第93-94页 |
| REFERENCES | 第94-115页 |
| C.V. | 第115-116页 |
