Urinary Concentrations of Hydroxyproline and 3-Methyl Histidine in Postpartum Cow

摘要

The urinary concentrations of hydroxyproline(HYPRO)and 3 - methyl histidine (3 - MEHIS) were determined in 16 Chinese - Holstein cows. The objectives of the experiment were to find out thhe relationship between collagen and myosin ddegradation and uterine involution in the postpartum cow. The results in the experiment showed that the mean concentrations of HYPRO and 3-MEHIS were 138.92 ± 22. 99 and 37. 09 ±3. 90 nmol • mL~(-1), respectively, for the cows during the days between 60～90 postpartum, and for the cows immediately after calving the concentrations of HYPRO and 3 -MEHIS reduced from 284. 30 and 65. 48 nmol • mL~(-1) on the day one after calving to the normal level of 109. 18 and 33. 51 nmol • mL~(-1) on the day 50 post-partum, respectively. There was a good correlation between the urinary concentrations of both HYPRO and 3 - MEHIS and the diameters of the involuting uterus( r =0. 79).