SVIBOR - Project code: 3-03-317


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 3-03-317

The Influence of Hormones in the Blood of the Reprudactive Cows

Main researcher: KRZNARIĆ, MARKO (94223)

Type of research: applied
Duration from: 05/27/91. to 05/27/95.

Papers on project (total): 0
Institution name: Hrvatska akademija znanosti i umjetnosti, Zagreb (101)
Department/Institute: Centre for Scientific Work, Vinkovci
Address: Vinkovci, Duga ulica 11.
City: 32000 - Vinkovci, Croatia
Phone: 385 (0)32 33-23-16

Summary: Summary:Control the level of total estradiol (Oe) and progesterone (Pg-4) in the blood serum of a number of cows and heifers (mother-daughter) by radioimmunoassy method (RIA) at the moment of insemination. Repeat the same procedure with the same heads of cattle during the complete reproductive period and under the same condition of keeping and exploitation. Using the results you have got establish the correlation between the level of the total Oe and Pg-4 in the blood serum and the fertility for each yer respectively and for the whole time of the research by statistical methods. In yor analysis use as the fertility scale the service period (SP), the time between two subsequent bearings of the cows (TBB) and the herd reproductive status (HRS). If a correlation and statistical validity between the fertility and the level of Oe and Pg-4 in the blood serum can be proved, then it would be possible for us to apply selection to fertility using these results and not waiting for long and expensive research work by classical methods (progeny test and other tests). We were induced to do these researches by the preliminary researches which led us to the conclusion that the heads of cattle with alow level of Pg-4 in the blood serum at the time of insemination did not concept even after several inseminations (Veterinary station 5,1986.).

Keywords: Fertility selection, The reproduction data, The level of hormones, oestradiol, progesterone.

Research goals: It is difficult to define fertility in the genetic sense because it is under the influence of a complex of endogenous and exogenous factors. A fertility gene has not yet been proved, so the tendency to fertility is defined as the " stability of the neuroendocrine system." The goal of the research is to discover as many factors which influence fertility as possible. In the literature there are very few facts about the actual status of the possibility of selection as to a "bigger fertility". The results of the research could justify our opinion that the level of hormone in blood is individually a better basis for the genetic differentiation and selection in fertility. (A Collection from the conference of veterinarians, Primosten 1983., 1984., 1987., 1990.). It would make the selection of animals for fertility much easier and decrease the costs of production.


  1. Name of institution: Veterinarski zavod, Vinkovci P D Otok

Other information about the project.
MZT Croatian language SVIBOR Alphabetic list Sorted on project code Sorted on institutions Search help
Ministry of
Science and
Sorted on
project code
Sorted on
Search Help

Last update: 10/30/95