Fertility of high producing dairy cows is today a big issue for commercial farm in Europe and all around the world. This study was made on Polish Holstein Friesian cows of Agricultural Experimental Farm Wilanôw-Obory (Poland) to evaluate the improvement of fertility permitted by the use of a specific supplementation (Ovulitral) given to the cows just before insemination. This specific dietary supplement is composed of trace elements, vitamins and amino-acids selected to enhance hormonal dialogue and reduce oxidation stress and hence improve fertility of cows. This experimentation has been made from October 2010 to July 2011, the 146 cows of the trial were assigned to a control/test group depending on their characteristics: lactation rank, days from calving, milk yield at peak. These cows were inseminated on natural heat by inseminators and the test group received 100 ml of Ovulitral at the insemination. Pregnancy of cows was validated by scan at 35 days after insemination. Success of insemination is about 48% on the control group versus 65% on Ovulitral group (p < 0.05). That improvement constitutes a significant difference. The improvement of fertility is higher for the cows in 1st and 2nd lactation. It is also interesting to point out that there is no difference of improvement of fertility between the cows inseminated before or after 80 days on the two groups on trial. These results confirm results obtained with Ovulitral on commercial farms in France.
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