Open AccessREDUCTION OF THE VOLUNTARY WAITING PERIOD BY USE OF HORMONAL PROTOCOLS AND FIXED-TIME ARTIFICIAL INSEMINATION (FTAI) IN DAIRY COWS
Author(s) -
Miriane Suplicy,
Haroldo Suplicy Filho,
Luiz Ernandes Kozicki,
José Carlos dos Santos Breda,
Romildo Romualdo Weiss,
Márcio Saporski Segui
Publication year - 2012
Publication title -
archives of veterinary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.15
H-Index - 9
eISSN - 2317-6822
pISSN - 1517-784X
DOI - 10.5380/avs.v17i3.21676
Subject(s) - equine chorionic gonadotropin , estradiol benzoate , artificial insemination , medicine , cloprostenol , estrous cycle , zoology , pregnancy , hormone , insemination , ice calving , gynecology , ovulation , lactation , endocrinology , andrology , biology , sperm , genetics , ovariectomized rat
The aim of this study was to reduce the waiting voluntary period in dairy cows by administration of two different hormonal protocols for estrus synchronization and fixed-time artificial insemination (FTAI). One hundred twenty-eight Holstein dairy cows were studied. Three groups (G) were carried out: G1 (44 treated), G2 (34 treated) and G3 (50 as control). In the treated cows the following hormonal protocols was applied between 40 and 45 days post partum: G1- Day 0 (D0) - bovine intravaginal device containing progesterone (P4) plus 1.0 mg of estradiol benzoate (EB), D8 - removal of the P4, plus 0.5 mg of cloprostenol plus 400 IU of equine chorionic gonadotropin (eCG), D9 - 1.0 mg of EB and FTAI after 36 hours. G2 - D0 - P4 intravaginal plus 50 mcg of gonadotropin-releasing hormone (GnRH), D7 - removal of the P4 plus cloprostenol plus 400 IU eCG; D9 - 50 mcg of GnRH and FTAI 16 hours after. G3 – Control group inseminated 12 hours after the visual estrus. Results: G1 and G2 were inseminated (FTAI) respectively in the D55.5 and D56.8 after calving, while the G3 in the D84.5 (p 0.05). In Conclusion: there was significant reduction in the voluntary waiting period in treated cows and higher pregnancy rate although not significant.