高含量乳清粉的仔猪配合饲料热特性及调质温度控制

为探究热敏性饲料原料乳清粉及不同含量乳清粉的仔猪配合饲料的热物理特性,该文以仔猪料配方中的4种主要饲料原料玉米、豆粕、乳清粉和鱼粉为研究对象,采用混料设计的方法得到33种不同含量(0-30%)乳清粉的仔猪配合饲料,并利用差示扫描量热法(differential scanning calorimetry,DSC)测定了4种单一原料在25-120℃范围内以及33种仔猪配合饲料在25-110℃范围内的比热,分析了乳清粉及高含量乳清粉(质量分数≥14.548%)的仔猪配合饲料的热变性过程。结果显示:玉米、豆粕和鱼粉的比热分别与温度(25-120℃)呈线性、对数和二次关系,而乳清粉的比热与温度(25-1...

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Published in农业工程学报 Vol. 33; no. 16; pp. 299 - 307
Main Author 孔丹丹 方鹏 王红英 陈啸 岳岩 吕芳 金楠
Format Journal Article
LanguageChinese
Published 中国农业大学工学院,国家农产品加工技术装备研发分中心,北京100083 2017
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Summary:为探究热敏性饲料原料乳清粉及不同含量乳清粉的仔猪配合饲料的热物理特性,该文以仔猪料配方中的4种主要饲料原料玉米、豆粕、乳清粉和鱼粉为研究对象,采用混料设计的方法得到33种不同含量(0-30%)乳清粉的仔猪配合饲料,并利用差示扫描量热法(differential scanning calorimetry,DSC)测定了4种单一原料在25-120℃范围内以及33种仔猪配合饲料在25-110℃范围内的比热,分析了乳清粉及高含量乳清粉(质量分数≥14.548%)的仔猪配合饲料的热变性过程。结果显示:玉米、豆粕和鱼粉的比热分别与温度(25-120℃)呈线性、对数和二次关系,而乳清粉的比热与温度(25-110℃)遵循三次多项式的关系;当配合饲料中含有≥6.25%的乳清粉时,其比热与温度遵循三次多项式的关系;配合饲料的比热显著受温度、原料配比以及二者交互作用的影响(P〈0.001),其中,温度的影响最为显著,而乳清粉含量的影响次之。DSC热焓曲线上,乳清粉在109.79℃会出现吸热峰,为乳清蛋白的热变性导致;而随着温度由20℃升高到110℃,乳清粉颗粒由存在许多凸起与微孔的粗糙表面结构逐渐过渡为光滑、粘结的状态。与乳清粉相似,高含量乳清粉的配合饲料也会在77.95-87.69℃出现吸热峰。在仔猪配合颗粒饲料的加工过程中,为降低乳清蛋白的变性程度、减少环模制粒机的堵机现象,应将调质温度降低至70℃以下为宜。研究结果为高含量乳清粉的仔猪配合饲料的调质、制粒等热处理过程的工艺优化提供理论指导。
Bibliography:specific heat; temperature; physical properties; whey powder; formula feed; thermal denaturation; DSC(differential scanning calorimetry)
11-2047/S
Kong Dandan, Fang Peng, Wang Hongying, Chen Xiao, Yue Yan, Lu Fang, Jin Nan (National R&D Center for Agro-processing Equipment, College of Engineering, China Agricultural University, Beijing 100083, China)
Whey powder is a kind of thermosensitive feedstuff,which is particularly prone to pyrogenation and protein denaturation in conditioning and pelleting processing of pellet feed for weanling pigs.Pellet mill can be blocked easily when the feed formulation is designed with high level of whey powder.Studies on thermal proprieties of whey powder and formula feed containing different levels of whey powder are required for parameter optimization in thermo processing of formula feed.As corn meal,soybean meal,whey powder and fish meal are the most common and important ingredients in the diet of weanling pigs,33 kinds of formula feeds consisting of different levels of corn me
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.16.039