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TDK conference 2015

Characteristics of the uterine pressure in twinning cows during physiological and pathological puerperium
Zámbó Laura - year 6
SzIU, Faculty of Veterinary Science, Department and Clinic of Food Animal Medicine
Supervisor: Árpád Csaba Bajcsy DVM


Involution basically determines reproductive efficiency of dairy cattle. Its duration depends on multiple factors, among which uterine contractility might play a major role. We aimed to study this effect both after twin pregnancies and in cases of fetal membrane retentions. Therefore, twinning cows were used for the non-invasive recordings of intrauterine pressure. The data of intrauterine pressure changes were collected 12 hours after parturition for 4 hours, and another three times for 1 hour with 12 hour differences between measurements. By analysing the pressure cycles we were able to calculate the frequency (number of intrauterine pressures per unit of time), the length of curves (duration), the mean and total area under curves and their amplitude (intensity). Moreover, we measured five times the blood calcium-ion concentration of the animals, from samplings linked to the pressure recordings.

For the examination we used 16 cows after twinnig, 6 from these animal retained their fetal membranes in both uterine horns, 5 were non-retained 12 hours after parturition and 5 others had retained fetal membranes in only one uterine horn. Another 22 cows after singleton calvings were used as controls, 7 of which had retained fetal membranes.

According to our results, during the early puerperium there was no significant difference in uterine contractility in terms of intrauterine pressure changes in cowsafter twin or single partruitions. However, we saw that the uterus of animals with retained fetal membranes were mechanically more active both in the twinnig and the control group. We could find any difference in intrauterine pressure changes between the two uterine horns in the twinnig and the control group, nor even when one of the uterine horns had retained fetal membranes. However, we could see significant changes in all of the uterine functional parameters during the course of time in each group. We could only partly examine the changes in blood ionized calcium levels due to the small amount of samples and the few cases of hypocalcaemic twinning cows. For he examination we used single-sample, two samples and paired t-test.

In our study we were able to prove that although there is no differency in the mechanical function of the uterine horns of cows after twin or single pregnancies 2 days after partruition, retained fetal membranes that play important role in reproductive biology have an although similar but more notable impact on the uterine contractility both after twin and single parturitions.

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