| Autor: |
Prvanović, Nikica, G. Perčulija, M. Cergolj, Z. Stojević, N. Filipović, T. Dobranić M. Samardžija, Grizelj, Juraj, Vince, Silvijo, I. Folnožić |
| Přispěvatelé: |
Emil Pilipčinec |
| Jazyk: |
angličtina |
| Rok vydání: |
2009 |
| Předmět: |
|
| Popis: |
Dystocia costitute a large and important part of the science of obstetrics. The economic importance of bovine dystocia in cattle industry forces researchers to find an easy way to produce large calf which will easy pass maternal genital tract or at least to find a way to determine wheter parturition needs to be guareded due to feto-maternal disproportion. It is practically impossible to guard every parturiton in large beeef herds what results with about a third of the total of the 17% of fetal and calf losses that occur at the time of parturition due to loss of observing the problem on time. The major cause of these losses was dystocia due to fetopelvic disproportion. To the loss of offspring must be added maternal deaths and subsequent infertility which derive from dystocia in all species as well as the cost of treatment and the deminished productive capacity of the dam. It has been known for many years that the incidence of fetomaternal disproportion is much higher in beef breeds and results with much higher probability of cesarean section or at least guided parturition. Incidence of dystocia in cows bred with Charolais bulls consists 14, 3% compared to 1, 9% for cows mated to Hereford bulls and 3, 5 % in matings by bulls of other breeds. There are also marked differences in dystocia levels in matings by particular Charolais bulls. The aim of this study was to explore optional way to diagnose fetal oversize in Charolais cows and monitor fetal growrh in the last trimester of pregnancy. After routin rectal and ultrasoud examination of Charolais herd we have chosen six multiparous pregnant cows. They were kept in the same herd and mated with the same bull. They all were five months pregnant and 4-6 years old. We followed pregnancy by ultrasound examination once weekly during 5., 6. , 7. 8. and 9. month of pregnancy. We followed growth of placentomes (four by each examination and each cow using middle value as a standard), eye and head diameter and thorax range (if reachable). We also monitored parturition and compared birth weight for each calf. We compared foetal sex for each calf and compared it with fetal growth and birth weight. We found strong correlations between diameters of placentomes and intensity of foetal growth on basis of fetometrical measurements. We also found strong linear correlations between intensity of fetal growth and birth weight. We didn't find significant correlations between sex of calfs (male or female) with intensity of fetal growth nor birth weight. We didn't observe dystocia in any of monitored cows. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
