The effect of selected factors at insemination on reproduction of Holstein cows
2002
Stadnik, L. | Louda, F. | Jezkova, A. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic). Katedra Chovu Skotu a Mlekarstvi)
Our aim was to evaluate the effects of selected factors on conception rate and incidence of ovarian cysts in Holstein cows. The experimental group comprised 442 reinseminated Holstein cows in first to fifth lactation; 1,085 inseminations were evaluated. The factors studied were as follows: year of insemination, lactation number, size of the ovaries, incidence of ovarian follicles, oestrus signs intensity, degree of body condition at insemination, average daily milk yield in the week of insemination. The daily milk yield averaged 28.02 kg. The conception rate increased significantly (P 0.05) with increasing body condition at insemination, the highest conception rate being obtained for cows awarded 3-4 points on a 5-point scale. The lowest incidence of ovarian cysts (31.80-33.33 %) was found in cows scoring 2-3 points for body condition, the incidence of 37.80-41.67 % was found in cows scoring 4-5 points.
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