Comparative evaluation of the efficiency of artificial insemination of high producing dairycows, depending on protocols of estrus stimulationinOJSC «Vaganovo» livestock breeding complex

Increasing the number of highly productive cattle livestock depends on many factors, the main of which are selected methods of artificial insemination and schemas of estrus induction in animals. Today, there are several methods of artificial insemination of cow, and the most effective and generally accepted is arectocervical method, but the question of stimulation and estrus synchronization and preparing animals for subsequent fertilization is still relevant. During the investigation the comparative evaluation of the efficiency of artificial insemination of high producing dairy cows depending on protocols of estrus stimulation was carried out. The animals were divided into three groups. Group I was the control, for animals from group II the standard «Double ovsynch» protocol was used, for group III the author’s protocol with additional injection of ASD-fraction combined with «Eleovit» at a dose of 2+5ml/head and «Sidemen» with amount of 8 ml/head was applied. Insemination was carried out upon detection of behavioral estrous signs.The efficiency of hormonal stimulation of the protocols was evaluated by indices of Heat Detection Rate (HDR), Conception Rate (CR), and Pregnancy Rate (PR). Pregnancy diagnosis was performed on the 35-day after artificial insemination using Easy-Scan 8,0MHz. In the course of the study it was established that the application of the Protocol of estrus stimulation and preparing animals for the procedure of artificial insemination developed by authors allows to reach 76.5% of fertilization efficiency, what is considerably higher than using conventional stimulation protocols.

cattle, insemination, the stimulation regimen, estrus, efficiencyindex, reproductive biotechnology, fertilization

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