The Influence of Hormones in the Blood of the Reprudactive Cows
Main researcher
: KRZNARIĆ, MARKO (94223) Assistants
VUČKO, MARIJAN (100846)
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
Communication
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.