Open AccessSTRATEGIES TO INCREASE FERTILITY DURING FIXED-TIME ARTIFICIAL INSEMINATION IN BEEF CATTLE
Author(s) -
Ana Clara Canto Souza,
AUTHOR_ID,
Gabrieli Dutra Gonçalves,
Andrey Osvaldo Souza Ferro,
Deborah Nakayama Yokomizo,
Denis Vinícius Bonato,
Marcelo Marcondes Seneda
Publication year - 2021
Publication title -
spermova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.102
H-Index - 1
eISSN - 2308-4928
pISSN - 2223-9375
DOI - 10.18548/aspe/0009.11
Subject(s) - artificial insemination , estrous cycle , pregnancy , beef cattle , follicular phase , ovulation , fertility , pregnancy rate , ovulation induction , insemination , zoology , biology , medicine , endocrinology , population , environmental health , genetics
The application of Fixed Time Artificial Insemination (FTAI) protocols has strongly boosted artificial insemination in Brazilian bovine herds. The control of the estrous cycle with protocols based on progesterone and estrogen involves synchronizing the emergence of a follicular wave, controlling the progesterone phase, and inducing ovulation in a synchronized manner. The increase in pregnancy rates starts with the preparation of the breeding season and the choice of protocols and females. Thereafter, based on the characteristics of the property and the lots of animals, small adjustments can be made to the hormonal protocols as needed. Finally, resynchronization can increase usability by allowing multiple inseminations within short periods. The search for new strategies is of paramount importance for the development of the FTAI protocol and the increase in final pregnancy rates. Thus, this review sought to highlight the main critical points and adjustments of the FTAI protocols and their applicability in the reproduction of beef cattle.