Split-time AI : using estrus detection aids to optimize timed artificial insemination
Loading...
Meeting name
Sponsors
Date
Journal Title
Format
Document
Subject
Abstract
"Timed artificial insemination (AI) pregnancy rates can be optimized through use of a split-time AI approach following administration of certain protocols. Using split-time AI, insemination of non-estrous females is delayed until 24 hours after the scheduled time for fixed-time AI. Estrotect estrus detection aids applied at the time of PG administration allow producers to determine the estrous status of females and inseminate at the optimal time. The development of protocols that effectively facilitate synchronization of estrus and ovulation has enabled producers to increase the use of fixed-time artificial insemination (FTAI) in beef heifers and cows, rather than performing artificial insemination on the basis of detected estrus. In this approach, AI is performed at a predetermined time following prostaglandin F2a (PG) administration. Previous research efforts have evaluated several protocols to determine the appropriate time at which to perform FTAI. For example, following the 14-day CIDR-PG protocol for heifers, the pregnancy rate to FTAI is highest when FTAI is performed 66 hours after PG administration. Acceptable pregnancy rates can be obtained using FTAI following several protocols; however, a proportion of females undergoing estrus synchronization do not express estrus prior to FTAI. To account for these non-estrous animals, all cows and heifers are administered gonadotropin-releasing hormone (GnRH) at FTAI to ensure that ovulation is induced. However, endocrine changes associated with estrus expression are known to positively influence fertility, and pregnancy rates are on average 27% lower among females that fail to express estrus prior to FTAI (Perry and Smith, 2015)."--First page.
Table of Contents
DOI
PubMed ID
Degree
Thesis Department
Rights
Archive version. For the most recent information see extension.missouri.edu.
OpenAccess.
OpenAccess.
License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
Provided for historical documentation only. Check Missouri Extension and Agricultural Experiment Station sites for current information.
Provided for historical documentation only. Check Missouri Extension and Agricultural Experiment Station sites for current information.