摘要
通过分析泌乳初期健康、酮病和低钙血症奶牛血液生化指标及乳成分,明确相关疾病的乳成分特征,同时对泌乳初期奶牛血液生化指标与乳成分相关性进行分析,以期为牛群健康评价提供方法支持。根据血液指标选取产后7~21d荷斯坦奶牛72头,分为亚临床低钙血症试验组、酮病试验组和健康对照组,每组各24头。采集试验奶牛的血液和乳汁用于血液生化指标与乳成分相关性分析。结果显示,酮病和低钙血症引起乳蛋白和非脂乳固体水平降低,而乳中柠檬酸的含量增加。奶牛乳中柠檬酸与血清NEFA、BHBA和GLU相关性方程分别为:y=3.192x-0.802,R^2=0.363;y=4.594x-0.793,R^2=0.320;y=1.228x+0.775,R^2=0.261;其中方程中x为乳中柠檬酸的含量。结果表明,乳中柠檬酸的含量与血液NEFA呈显著正相关,可用于能量负平衡的早期诊断标示物。血中BUN及ALB的水平可用于评价乳蛋白和尿素的水平。
Biochemical indexes and blood composition in early lactation health, ketosis and hypocal-cemia dairy cows were analyzed to make sure the milk composition characteristics with related dis- eases, the correlation analysis between early lactating dairy milk composition and blood biochemical were also make in order to provide support for the cattle health assessment. According to the- blood index,72 Holstein cows 7-21 d postpartum,were divided into group subclinical hypocalce- mia,ketosis test group and control group, 24 heads each group. The blood and milk of cows were collected and used to analyze the correlation between blood biochemical indexes and milk composi- tion. The results showed that ketosis and hypocalcemia induced the level of milk protein and non fat milk solids decreased, while the content of citric acid in milk increased. The correlation equation between citric acid in milk and serum NEFA, BHBA and GLU was y= 3. 192=c-0. 802, （R^2= 0. 363） ,y=4. 594x-0. 793, （R^2 =0. 320） ,y=l. 228x＋0. 775, （R^2=0.261） ,in which x was the content of citric acid in milk. The results showed that the content of citric acid in milk had positively related to blood NEFA, which could be used as an early marker for the diagnosis of negative energy balance. The levels of BUN and ALB in blood can be used to evaluate the levels of milk protein and urea.
出处
《中国兽医学报》
CAS
CSCD
北大核心
2017年第8期1566-1570,共5页
Chinese Journal of Veterinary Science
基金
黑龙江省省自然科学基金面上资助项目(C2015043)
