Medycyna Wet. 64 (6), 807-811, 2008
W. Barański, T. Janowski, M. Raś, S. Zduńczyk, G. Opsomer, J. Dewulf, A. De Kruif
Incidence of reproduction disorders and fertility parameters in dairy herds under the herd health program
Reproduction control is a very important part of the herd health program. It has been observed that fertility declines in herds with increased milk yield. Changes in Polish agriculture, including dairy cattle, have been implemented for about 15 years. The aim of this study was to evaluate the incidence of reproduction disorders and different fertility indices in dairy cattle. The study was carried out in 8 dairy herds in North-East Poland with the herd health control and with milk yields from 5200 to 8200 l. The obtained results showed that the incidence of clinical forms of reproduction disorders differed significantly (p ≤ 0.05-0.01) among herds and their value were as follows: abortion rate – 4.0% (1.3 – 7.1%); retained placenta – 9.7% (5.7 – 15.6%); endometritis – 18.3% (5.7 – 42.7%); silent heat – 32.1% (12.5 – 49.2%); cystic ovarian disease – 7.1% (0 – 17.7%) and ovarian afunction 7.6% (1.4 – 16.9%). The intercalving period was 399.7 ± 62.8 days and the culling rate because of reproduction failure was 4.6% (0 – 9.1%). Reproduction indices describing the quality of artificial insemination were good and carried out as follows: first insemination rate was 52.3% (44 – 65.3%), service per conception rate was 1.8 (1.5 – 2.1). The study showed that the most important factor for a longer intercalving period was silent heat. It was likewise observed that the prevalence of ovarian malfunctioning and ovarian cysts as well as endometritis was lower.
Key words: cows, reproduction disorders, herd health program