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　　本試驗旨在研究以玉米秸稈為粗料的綿羊日糧中添加多聚物包被尿素以及膨潤土對綿羊生產(chǎn)性能的影響。試驗一：采用4只裝有瘤胃瘺管的杜泊×小尾寒羊雜交羯羊,按照4×4拉丁方試驗,研究以玉米秸稈為主的粗料型日糧中添加多聚物包被尿素（Optigen Ⅱ）以及膨潤土對綿羊采食量、營養(yǎng)物質消化率、氮沉積、瘤胃發(fā)酵以及微生物蛋白質合成量的影響。試驗羊只單欄獨飼,每期試驗持續(xù)24天,包括14天的適應期以及10天的采樣期（第l到5天進行消化代謝試驗,第6天羊只休息,第7天采瘤胃液,第8到10天進行尼龍袋試驗）,消化代謝試驗開始前4天將試驗羊只上代謝籠進行環(huán)境適應。試驗設計了4種等氮等能日糧,均含60%玉米秸稈和40%精料（干物質基礎）。各處理間精料組成均不同：對照組（CON）包含大麥、麩皮和豆粕；多聚物包被尿素（PCU）組包含大麥、麩皮、玉米和Optigen;豆粕添加組（SB）在CON基礎上額外補充2%的豆粕；多聚包被尿素-豆粕組（PCUSB）在PCU基礎上額外補充2%的豆粕。試驗數(shù)據(jù)按4×4拉丁方數(shù)據(jù),使用SAS的MIXED模型（SAS,1999）進行方差分析。試驗結果表明,PCU組的有機物（OM）表觀消化... 

【文章來源】：中國農(nóng)業(yè)科學院北京市

【文章頁數(shù)】：116 頁

【學位級別】：博士

【文章目錄】：
摘要
Abstract
Abbreviations
CHAPTER Ⅰ Literature Reviews
    1.1 Nutritive quality of corn stalk
    1.2 Possible strategies to improve corn stalk utilization
        1.2.1 Physical treatment
        1.2.2 Chemical treatment
        1.2.3 Biological methods
        1.2.4 Enzymatic treatment
        1.2.5 Feeding corn stalk supplemented with other components
    1.3 Effects of synchronization of carbohydrate and protein supply on rumen fermentation
    1.4 Utilization of urea by ruminants
    1.5 Role of ammonia in ruminant's rumen
    1.6 Urea recycling in ruminant
    1.7 Disadvantages of Urea Utilization for Ruminants
    1.8 Usage of new urea products (slow releasing urea) in ruminant's diets
        1.8.1 Influence of slow releasing urea on feed consumption and digestibility
        1.8.2 Influence of slow releasing urea on rumen fermentation
        1.8.3 Influence of slow releasing urea on ruminal microbial protein synthesis
        1.8.4 Influence of slow releasing urea on performance of feedlot animals
    1.9 Optigen Ⅱ as a polymer coated Urea
    1.10 Use of sodium bentonite in animal nutrition
        1.10.1 Chemical composition of sodium bentonite
        1.10.2 Effect of bentonite on DMI and digestibility in ruminants
        1.10.3 Effect of bentonite on rumen fermentation
        1.10.4 Effect of bentonite on growth performance
    1.11 The key problem needed to address
    1.12 Hypothsis
    1.13 Objectives of the Project
CHAPTER Ⅱ Effects of dietary polymer coated urea and sodium bentonite onnutrient digestibility, rumen fermentation, and microbial nitrogen yields in sheepfed high levels of corn stalk
    Summary
    2.1 INTRODUCTION
    2.2 MATERIALS AND METHODS
        2.2.1 Animals, diets, experimental design, and management
        2.2.2 Sample Collection
        2.2.3 Chemical analyses
        2.2.4 Calculations and statistical analysis
    2.3 RESULTS
        2.3.1 Intake, Digestibility and Nitrogen Balance
        2.3.2 Urinary purine derivatives
        2.3.3 Ruminal fermentation characteristics
        2.3.4 Rumen degradability
    2.4 Discussion
        2.4.1 The effect of polymer-coated urea (PCU)
        2.4.2 The effect of sodium bentonite (SB)
        2.4.3 The effect combination of PCU and SB
    2.5 Chapter conclusion
CHAPTER Ⅲ Effect of dietary polymer coated urea and sodium bentonite ondigestibility, rumen fermentation, and microbial nitrogen yield in sheep fed highlevels of concentrate, and corn stalk as basal roughage diet
    Summary
    3.1 Introduction
    3.2 MATERIALS AND METHODS
        3.2.1 Animals, diets, housing and experimental design
        3.2.2 Sample Collection
        3.2.3 Chemical analyses
        3.2.4 Calculations and statistical analysis
    3.3 RESULTS
        3.3.1 Dry matter intake,digestibility and nitrogen balance
        3.3.2 Urinary purine derivatives
        3.3.3 Ruminal characteristics
        3.3.4 Rumen degradability
    3.4 DISCUSSION
        3.4.1 The effect of polymer-coated urea(PCU)
        3.4.2 The effect of Sodium bentonite(SB)
        3.4.3 The combination effect of PCU and SB
    3.5 CHAPTER CONCLUSION
CHAPTER Ⅳ Substitution of polymer coated urea for soybean meal on growthperformance and blood parameters in feedlot lambs fed corn stalk as basalroughages diet
    Summary
    4.1 Introduction
    4.2 MATERIALS AND METHODS
        4.2.1 Experimental design
        4.2.2 Receiving and processing
        4.2.3 Diets,feeding and sample collection
        4.2.4 Slaughtering process
        4.2.5 Carcass characteristics
        4.2.6 Instrumental meat quality analyses
        4.2.7 Blood metabolites
        4.2.8 Laboratory analyses
        4.2.9 Calculations and Statistical Analysis
    4.3 RESULTS
        4.3.1 Dry matter intake and growth performance
        4.3.2 Carcass characteristics
        4.3.3 Meat quality
        4.3.4 Blood metabolite parameters
    4.4 Discussion
        4.4.1 DMI, Performance and carcass quality
        4.4.2 Meat quality
        4.4.3 Blood metabolite characteristics
CHAPTER CONCLUSION
GENERAL CONCLUSION
INNOATION
REFERENCES
ACKNOWLEDGEMENTS
CV


【參考文獻】：
期刊論文
[1]纖維素復合酶在飼料中的作用及其應用的研究[J]. 王安.  東北農(nóng)業(yè)大學學報. 1998(03)



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