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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Clinical-biochemical Observations in Periparturient Dairy Cows with Experimentally Induced Fatty Liver) ผู้เขียน: ดร.ธีระ รักความสุข, รองศาสตราจารย์ ,  Theo Wensing, Henk J. Breukink สื่อสิ่งพิมพ์:pdf AbstractIn 4 experimental studies, occurrences of health problems during the first 4 weeks of lactation were monitored in 36 control cows and 38 experimental cows that were overfed during the dry period to induce overconditioning at calving and deep negative energy balance and fatty liver postpartum. The experimental cows experienced postparturient problems, including milk fever (37%), acetonemia (8%), abomasal displacement (8%), mastitis (10%), and hoof problems (8%). Acetonemia and abomasal displacement were not observed in the control cows. Milk fever, mastitis, and hoof problems were observed in 3%, 6% and 3% of the control cows, respectively. The experimental cows gained more body weights during the dry period and lost more weights during the first 4 or 5 weeks of lactation than did the control cows. Between 1 and 2 weeks after parturition, the experimental cows had higher concentrations of blood nonesterified fatty acids, blood 3-hydroxybutyrate, and liver triacylglycerols, and had lower concentrations of liver glycogen than did the control cows. Blood glucose and insulin concentrations did not differ between the two groups. When data of the 4 studies were pooled, blood nonesterified fatty acid concentrations were positively correlated with blood 3-hydroxybutyrate and liver triacylglycerol concentrations, and were negatively correlated with liver glycogen concentrations. These results indicated that cows responded to a marked increase in energy requirements in early lactation by increased glycogenolysis in the liver and lipolysis in adipose tissue. In conclusion, overfeeding of cows during the dry period resulted in overcondition at calving. Overconditioning predisposed a cow to develop severe fatty liver postpartum and to experience more postparturient problems. The concentration of blood nonesterified fatty acids postpartum could be used as a routine indicator for the development of fatty liver in dairy cows postpartum. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Negative Energy Balance in Periparturient Dairy Cows Raised in Small-Holder Farms in Kamphaengsaen District, Nakhon Pathom Province) ผู้เขียน:ดร.ธีระ รักความสุข, รองศาสตราจารย์, ดร.นิติพงศ์ หอมวงษ์, ผู้ช่วยศาสตราจารย์ , Weerapong Bumkhuntod, Piyakan Rohitakanee, Rungthip Sukcharoen สื่อสิ่งพิมพ์:pdf AbstractNegative energy balance was studied in 45 periparturient dairy cows from 15 small-holder farms in Kamphaengsaen District, Nakhon Pathom Province. Blood samples were collected at 1 week prepartum and 2 and 4 weeks postpartum for evaluation of negative energy balance and to study the relationship between concentrations of serum non-esterified fatty acid, serum glucose and body condition score. The results revealed that there were no significant differences in concentrations of non-esterified fatty acid at 1 week prepartum and 2 and 4 weeks postpartum. The concentrations of serum glucose and body condition score were significantly decreased after parturition. The changes of body condition score between 1 week prepartum and 2 weeks postpartum (r = 0.475) or between 1 week prepartum and 4 weeks postpartum (r = 0.364) were positively correlated with serum concentrations of non-esterified fatty acid at 2 weeks postpartum. In conclusion, periparturient dairy cows of small-holder farms in Kamphaengsaen District, Nakhon Pathom Province had some degrees of negative energy balance as observed by decreased serum glucose concentration and decreased body condition score. The results of this study would be useful for small-scale herd management to prevent periparturient negative energy balance problems and its consequences. |