The influence of season and sire on the results of superovulation and embryo transfer

Abstract

The aim of the study was evaluate the influence of season and sires on profit and quality of embryos after superovulated treatment. Next we evaluated the conception rate after transfer of fresh and frozen embryos.In 1991–2004 there were used the beef cattle. Into the basic statistic evaluation it was involved 487 realised embryo recoveries and 2008 realised transfers in 1991–2004. Data for database were obtaining from ETprotocols – ET team Research Institute for Cattle Breeding, Ltd., Rapotin, prof. Říha. The data processing was carried out by means of the common variation-statistical methods.The best results were achieved in summer (suitable 3.68 ± 3.65; the ratio of the suitable and total: 59.3%) and in autumn (suitable 3.54 ± 3.80; the ratio: 54.48%) and the good results, little different from the summer and autumn results, were achieved in spring.The average number of the recovered ova of the chosen breeds sires were variable (from 6.60 ± 6.17 in Blonde d´Aquitaine to 17.16 ± 6.66 in Charolais). The most of the suitable embryos was recovered in the donors inseminated by the Hereford breed sires (7.15 ± 6.42). It was evaluated the above-average conception in the Simmental breed (63.43 %).

Keywords

• beef cattle breeds
• donors
• recipients
• superovulation
• embryo transfer
• conception rate