1. Response to ACTH Challenge in Female Dairy Calves in Relation to Their Milk Yield
- Author
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A. T. Tran, J. Seenger, E. Szűcs, Miklós Mézes, András Gáspárdy, J. A. Nasser, Cs. Ábrahám, J. Janbaz, Hedvig Fébel, Gy. Huszenicza, and I. Györkös
- Subjects
medicine.medical_specialty ,Milk protein ,Insulin ,medicine.medical_treatment ,Area under the curve ,Acth challenge ,Biology ,Endocrinology ,Milk yield ,medicine.anatomical_structure ,Close relationship ,Internal medicine ,Lactation ,medicine ,Animal Science and Zoology ,Dairy cattle ,Food Science - Abstract
Attempts have been made to establish relationship between the response to ACTH challenge in female calves, growth and first lactation performance. A total of 19 Holstein calves weighing 100 kg i. v. were given 0.50 IU of ACTH/kg BW .75 (EXACTHIN inj., Richter G., Budapest) at 60 days of age. Serial blood samples were taken at times 0, 0.5, 1, 2, 3, 4 and 5 hours and analyzed for cortisol, glucose insulin and FFA levels. From challenge series the area under the curve from time of administration and the following 5 h were calculated. Negative, and mostly loose relationship between response to ACTH challenge for cortisol, insulin, or FFA and ADWG during growth have been established (p>0.05) with positive one for glucose. Bivariate coefficients of correlation varied within the range from -0.35 to 0.15. Estimations reveal negative correlation between the length of first lactation and cortisol or insulin (r=-0.80, p
- Published
- 2003
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