發(fā)布時間：2024-01-20 13:17

　　近年來,隨著消費者對禽肉需求的增加和禽肉生產(chǎn)成本的降低,家禽生產(chǎn)產(chǎn)業(yè)比其他肉類動物生產(chǎn)產(chǎn)業(yè)增長得更快。但目前家禽生產(chǎn)仍然面臨諸多營養(yǎng)技術(shù)難題,如飼糧配方制定和營養(yǎng)需求的準確評定等。磷(P)是維持機體生長和骨骼發(fā)育以及實現(xiàn)基因組功能所必需的一種常量礦物元素。肉雞日糧中含有大量的植物源性原料,這些原料中存在著如植酸或植酸鹽等抗營養(yǎng)因子。由于肉雞對植酸磷的消化利用能力極其有限,導(dǎo)致了養(yǎng)分消化率的降低和糞便磷排泄量的增加,進而加劇了對生態(tài)環(huán)境的污染。研究表明,日糧因素對肉雞表觀磷回腸消化率有著顯著的影響,但同時也會影響內(nèi)源性的磷損失。提示回腸真磷消化率才能準確的反映和評定肉雞對日糧中磷的消化和吸收能力。因此,準確評定肉雞的回腸真磷消化率并研究日糧因素在其中的影響,將有助于更精準的配制環(huán)境友好型的肉雞日糧。日糧鈣磷比、磷水平以及蛋白來源和水平對肉雞表觀回腸磷消化率的影響已被諸多報道證實,但關(guān)于上述日糧因素能否影響肉雞的回腸真磷消化率尚未見報道,有待進一步研究。因此,本研究旨在采用線性回歸方法研究日糧因素對肉雞回腸真磷消化率的影響。本研究包括以下4個試驗:試驗一旨在用線性回歸法研究不同鈣磷比(Ca...

【文章頁數(shù)】：105 頁

【學(xué)位級別】：博士

【文章目錄】：
摘要
ABSTRACT
ABBREVIATIONS
CHAPTER 1.REVIEW LITERATURE
    1.1 BIOLOGICAL FUNCTIONS OF PHOSPHORUS
        1.1.1 Bone formation
        1.1.2 Cell metabolism
        1.1.3 Genetic messae transportation
    1.2 PHOSPHORUS UTILIZATION
    1.3 DIGESTIVE SYSTEM OF CHICKENS
    1.4 PHOSPHORUS SOURCES
        1.4.1 Plant-based sources
        1.4.2 Animal-based sources
        1.4.3 Inorganic sources
    1.5 PHOSPHORUS DIGESTION AND ABSORPTION
    1.6 APPARENT AND TRUE ILEAL DIGESTIBILITY OF PHOSPHORUS
        1.6.1 Apparent ileal digestibility
        1.6.2 True ileal digestibility
    1.7 THE METHODS USED TO CONCLUDE THE TRUE ILEAL DIGESTIBILITY OFPHOSPHORUS
        1.7.1 The phosphorus-free diet
        1.7.2 Isotope dilution method
        1.7.3 The difference and direct method
        1.7.4 THE LINEAR REGRESSION METHOD
    1.8 DIETARY FACTORS AFFECT THE PHOSPHORUS DIGESTIBILITY
        1.8.1 Calcium to phosphorus ratio
        1.8.2 Vitamin D
        1.8.3 Phytate-phosphorus content
        1.8.4 Phytase
    1.9 OBJECTIVES OF THE CURRENT STUDY
CHAPTER 2.EFFECTS OF DIETARY CALCIUM-TO-PHOSPHORUS RATIOS ON THEDETERMINATIONOF TRUE PHOSPHORUS DIGESTIBILITY FOR BROILER CHICKENS
    2.1 ABSTRACT
    2.2 INTRODUCTION
    2.3 METHODOLOGY
        2.3.1 Birds management and experimental diets
        2.3.2 Sample collection
        2.3.3 Chemical analyses
        2.3.4 Calculations and statistical analyses
    2.4 RESULTS
    2.5 DISCUSSION
CHAPTER 3.DIETARY TOTAL PHOSPHORUS CONCENTRATION AFFECTS THEESTIMATES OF TRUE PHOSPHORUS DIGESTIBILITY FOR BROILER CHICKENS
    3.1 ABSTRACT
    3.2 INTRODUCTION
    3.3 METHODOLOGY
        3.3.1 Birds manaement and experimental diets
        3.3.2 Sample collection
        3.3.3 Chemical analyses
        3.3.4 Calculations and statistical analyses
    3.4 RESULTS
    3.5 DISCUSSION
CHAPTER 4.EFFECTS OF DIETARY TOTAL PHOSPHORUS CONCENTRATION AND CASEINSUPPLEMENTATIONON THE DETERMINATION OF TRUE PHOSPHORUS DIGESTIBILITYFOR BROILER CHICKENS
    4.1 ABSTRACT
    4.2 INTRODUCTION
    4.3 METHODOLOGY
        4.3.1 Birds management and experimental diets
        4.3.2 Sample collection
        4.3.3 Chemical analyses
        4.3.4 Calculations and statistical analyses
    4.4 RESULTS
    4.5 DISCUSSION
CHAPTER 5.TRUE PHOSPHORUS DIGESTIBILITY RESPONSE OF BROILER CHICKENS TODIETARY CRUDE PROTEIN LEVELS
    5.1 ABSTRACT
    5.2 INTRODUCTION
    5.3 METHODOLOGY
        5.3.1 Birds management and experimental diets
        5.3.2 Sample collection
        5.3.3 Chemical analyses
        5.3.4 Calculations and statistical analyses
    5.4 RESULTS
    5.5 DISCUSSION
CONCLUSION
ACKNOWLEDGEMENTS
6 REFERENCES
PUBLICATIONS



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