Stress response and negative energy balance observed in the blood of transition dairy cows
2008
Terao, H.(Hiroshima Univ., Higashi-hiroshima (Japan)) | Fujita, M. | Bungo, T.
In order to define the stress response and negative energy balance in the metabolic changes of transition dairy cows just after parturition, the plasma concentration of cortisol, glucose, noradrenaline (NA) and free fatty acid (FFA) were measured. Blood samples were collected from the coccygeal artery on the 14th day before parturition (-14D), the day of parturition (+1D), and the 5th (+5D), 10th (+10D), 20th (+20D) and 30th days (+30D) after parturition. The plasma concentration of cortisol was analyzed using the HPLC-UV system, and the plasma concentration of NA was analyzed using the HPLC-ECD system. The plasma concentration of cortisol and glucose increased significantly (P0.05, P0.05) on +1D. The plasma concentration of NA and FFA also increased (P0.05, P0.05) on +1D and remained at a slightly high level until +10D. Covariance analysis between cortisol and glucose showed a significant difference (P0.05) on +1D. This suggests a stress response caused by parturition. Covariance analysis between NA and FFA showed a significant difference (P0.05) on +1D, and on +5D and +10D. The different distribution on +1D suggests a stress response caused by parturition. The different distribution on +5D and +10D suggests FFA mobilization caused by the lack of energy for milk production. These results indicated an apparent stress response on +1D and this was followed by a negative energy balance in the transition dairy cow.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by Agriculture, Forestry and Fisheries Research Information Technology Center