Acta Univ. Agric. Silvic. Mendelianae Brun. 2020, 68, 9-16
Published online 2020-02-27

The Effect of High Summer Temperatures on Reproduction in Holstein and Czech Fleckvieh

Jiří Bezdíček1, Andrea Nesvadbová1, František Louda2

1Palacký University Olomouc, Department of Zoology and Laboratory of Ornithology, Faculty of Science, 17. listopadu 50, 771 46 Olomouc, Czech Republic
2Research Institute for Cattle Breeding Rapotin, Ltd., Department of Feed, Nutrition, Breeding and Reproduction, Výzkumníků 267, 788 13 Vikýřovice, Czech Republic

Received November 29, 2019
Accepted February 7, 2020

The aim of this study was to evaluate the effect of the hot summer season on the length of service period (number of days from calving to the next conception). For the analysis was created two databases of twins. Twins had the same sire and dam and the first and second lactations took place on the same farm. In the first database (105 pairs) one of the twins was calved (and had the following service period) during the summer months and the second of the twin was calved in the cooler months. To compare the difference in service period between twins in the hot and cool seasons, it was made also second group of twin pairs with reproduction only during the cool period of the year (cool vs. cool season; 58 pairs). The data were analysed using PROC GLM of Statistica®. In addition to season, the effect of breed (Holstein, Czech Fleckvieh), milk production at 1st lactation and calving year were also taken into consideration. The results showed a significantly longer service period in the summer (133.8 days) than in the cool months (114.7 days). In the case of twins with reproduction in the cool months of the year, the difference between length of service period was shorter and insignificant (113.6 vs. 119.4 days).


This work was supported by the student project IGA_PrF_2019_024 of the Palacky University and by Institutional research plan MZe CR RO1218 (26.2.2018). We would like to thank the „Czech Hydrometeorological Institute“ in Brno for the weather data too.


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