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Level of heifers´ conception rate after insemination of conventional and sexed dose
Ulbrichová, Michaela ; Stádník, Luděk (advisor) ; Zuzana, Zuzana (referee)
The object of the study was to compare the results of insemination of dairy cows by using type of insemination dose, convertional or sexed. The hypothesis is an assumption of higher level of heifers conception rate after insemination by convertional dose than by using a sexed dose.
The evaluation was conducted on the farm ZEAS Podorlicko a.s in the period from June 25th, 2013 to November 2nd, 2015 and there were monitored 998 heifers. Data for the evaluation were processed from the farm records and was created a database of heifers conception rate due to the type of insemination doses. For the statistical processing was used software SAS 9.3.
In the group of heifers was observed influence month, year, the rank of the insemination and type of insemination dose on the age of first insemination and its result.
At the level of significance (P < 0,001) was observed negative effect of insemination on age of first insemination (r = -0,195).
It was also proved, that year of insemination has effect on result of conception rate (r = 0,068) and the result insemination had a positive effect on age at first insemination.
These two phenomena were detected at the level of significance (P <0.05). Therefore, it was achieved a better level of conception rate in 2015 than in previous years (2013 and 2014) and also was demonstrated higher levels of successful conception rates with increasing age of heifers at first insemination.
Based on statistical significance (P <0.001) I found that level of heifers conception rate was higher after convertional insemination dose (65.69%) than sexed dose (37.28%). There was also a statistically significant difference between the month of insemination and its result. On the other side, there was no statistically significant effect of rank of insemination on its result.
According to those results the hypothesis, that there si higher level of conception rate by using convertional insemination dose, can be confirmed. The findings show us, that it is necessary to focus on reproduction in various parts of the year, especially in September, October, November and December, where the conception rate was lowest.
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