本论文第二部分主要研究了四种不同精粗比典型日粮条件下泌乳奶牛瘤胃氮素代谢、小肠蛋白质的消化吸收及其对生产性能的影响。
The second part was mainly conducted to study the effects of four typical diets on rumen nitrogen metabolism, protein digestion and absorption in the small intestine, and dairy cow's milk performance.
本试验结论：产前饲粮中添加阴离子盐能够改善奶牛产后的健康状况，提高泌乳性能。
It was concluded that the performance and health status of postpartum dairy cows can be improved when prepartum diets are supplemented with anionic salts.
酮病、脂肪肝奶牛伴发低血糖，泌乳量下降，血液多种生化指标、肝脂含量发生不同程度的改变。
Cows suffering from ketone disease and fatty liver disease would go with hypoglycemia, declining milk yield and changes of blood chemical indexes and fat contents in liver at different degrees.
牛奶品质的优劣受诸多因素的影响，如饲料组成与营养、奶牛泌乳阶段与水平、环境、疾病、品种等。
Milk quality is affected by several factors such as feed and feeding, milk lactation stage and milk performance, environment, diseases and breed.
治疗方案基于奶牛的治疗史，感染时间长度，和奶牛的年龄、健康状况和泌乳期。
Base treatment protocols on the cow's treatment history; length of the infection; and cow age, health status and lactation stage.
给产奶牛补加过瘤胃蛋白质如鱼粉和保护的大豆饼粕对提高乳蛋白含量和乳产量并不是最好的方法。
The provision of undegradable protein(fishmeal or protected soya)to the diet of lactating dairy cows is not the best method to raise the protein content in milk and the milk yield.
研究产奶量对热应激和非热应激期间奶牛血液、乳、和毛中微量元素的影响。
The influence of milk yield on trace elements in blood, milk and hair in the period of the heat stress and non heat stress were studied.
本试验共收集10316条DHI记录并分析了奶牛胎次和泌乳天数对牛奶尿素氮（MUN）含量的影响以及MUN值与产奶量和乳成分的关系。
The experiment used 10316 Dairy Herd Improvement(DHI)records to analyze the impact of parities and days in milk(DIM)on Milk Urea Nitrogen(MUN), and the relationship between MUN and milk composition.
经统计分析表明，北京奶牛群的乳用、肉用和次级性状经济重要性之比为2：1：2。
Statistical analysis shows that the economical importances of lactation, beef and secondary traits in this population are in the proportion of 2 : 1 : 2.
并对奶牛的各项繁殖指标与其泌乳曲线之间的相互关系进行了研究。
The inter relationship between every reproductive target and secreting curve have been studied.
奶牛泌乳过程中的泌乳量是随着时间而呈现规律性变化的，泌乳曲线及其数学模型是描述这一变化规律及趋势的有效方法之一。
Lactation curves and mathematical models of dairy cattle are one of effective methods accurately to describe rules of milk yield against time.
从遗传和选育的角度对乳蛋白性状进行了简要分析，指出乳蛋白性状将是今后奶牛育种工作的重点。
The trait of milk protein was analyzed with respect to genetics and breeding. It is important to study milk protein in the future in dairy cattle breeding.
摘要泌乳期间的奶牛由于代谢旺盛，往往会产生大量一氧化氮(NO)，诱导发生氧化应激，进而对细胞产生毒害作用。
Abstract: Due to exuberant metabolism, dairy cows produce a great deal of nitric oxide (NO) during lactation, which leads to oxidative stress, and then results in cell toxicity.
抵抗素被认为是联系胰岛素抵抗和肥胖的一个纽带，研究认为抵抗素可以引起肝脏的胰岛素抵抗，并且在奶牛泌乳期间，脂肪组织抵抗素表达升高。
Resistin has been known as a link between insulin-resistance and obesity. Resistin can cause insulin-resistance in liver, and its mRNA level increases in adipose tissue during lactation period.
根据对252头具有连续泌乳月奶牛的记录完整的档案分析，可将奶牛泌乳曲线分为三种类型，即平稳型、剧降型和波动型。
According to the records analysis in 252 cows, which are continuous secreting and recorded, the milk secreting curve can be divided into 3 types: stable, decline and undulate types.
摘要：本实验旨在研究黄芪多糖对泌乳期荷斯坦奶牛抗氧化能力的影响。
Abstract: the aim of this study was to analysis the effect of Astragalus polysaccharides (APS) on antioxidant capacity of lactating Holstein cows.
乳清是来自无病吃草的奶牛，全年的无农药，无农药，天然草地牧草。
The whey is derived from disease-free cows that graze year-round on pesticide-free, chemical-free, natural grass pastures.
结果：包头地区奶牛乳腺炎病原菌检出率高达5 7.5 % ，常见病原菌依次为金黄色葡萄球菌、大肠杆菌、绿脓杆菌、无乳链球菌、停乳链球菌、沙门氏菌、克雷伯氏菌。
Results:The detectable rate of the pathogenic germs in cow mastitis in Baotou district is high, up to 57.5%. The common pathogenic germs in cow mastitis are as follows: S. aureus, E.
结果：包头地区奶牛乳腺炎病原菌检出率高达5 7.5 % ，常见病原菌依次为金黄色葡萄球菌、大肠杆菌、绿脓杆菌、无乳链球菌、停乳链球菌、沙门氏菌、克雷伯氏菌。
Results:The detectable rate of the pathogenic germs in cow mastitis in Baotou district is high, up to 57.5%. The common pathogenic germs in cow mastitis are as follows: S. aureus, E.
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