The ovary activity in cows with and without retained fetal membranes
2010
Skuja, S., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine | Antane, V., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine
The aim of the study was to find out the ovary activity in cattle with and without retained fetal membranes. Sixty cows of different age of Latvian black-and-white breed from two Joint Stock Companies were used in the present research. The animals were divided into two groups: control group (cows without retained fetal membranes - NRFM) of 15 cows and 45 cows with retained fetal membranes (RFM). Research was performed from September 2007 to January 2009. The level of progesterone in blood serum and rectal ultrasonography were used to establish the ovary activity in cows. The serum progesterone concentration was analyzed every two days for six weeks. The mean serum progesterone concentration during the first 14 days postpartum (PP) in cows with and without RFM was under 1ng/ml. Subsequently (day 18 to 32), progesterone concentration in cows with RFM increased from 1.24 ± 0.14ng/ml to 6.43 ± 0,76ng/ml but in NRFM (day 18 to30) the progesterone increased from 0.74 ± 0.11ng/ml to 3.40 ± 1.15ng/ml. On day 42 PP, the progesterone level was decreased in both groups of cows: in RFM group to 3.34 ± 0.32 ng/ml, in the NRFM group to 1.97 ± 0.68 ng/ml (P is less than 0.05). When analysing the progesterone concentration in blood in individual animals during six weeks PP, it was found out that progesterone level was constantly low (less than 1ng/ml) in 32% of RFM cows and 20% of NRFM cows. The obtained results with ultrasonograph confirmed the ovary functional condition that was established according to the changes of the progesterone concentration in blood. It was concluded that in cows with retained fetal membranes the progesterone level postpartum was higher and decreased later in comparison with control group cows that could be the reason for a delayed folliculogenesis and ovulation.
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