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Başlık: Effects of presynchronization with gonadotropin-releasing hormone-prostaglandin F-2 alpha or progesterone before Ovsynch in noncyclic dairy cows
Yazarlar: Alkan, Ali
Okut, Hayrettin
Uludağ Üniversitesi/Veteriner Fakültesi/Jinekoloji ve Doğum Anabilim Dalı.
0000-0003-2817-3221
Yılmazbaş, Gülnaz Mecitoğlu
Karakaya, Ebru
Keskin, Abdülkadir
Gümen, Ahmet
AAH-3831-2021
AAG-4440-2019
AAH-1406-2021
36457964000
36457784500
24473229800
6602393069
Anahtar kelimeler: Agriculture
Food science & technology
Noncyclic cow
Ovsynch
Presynchronization
Progesterone
Timed artificial-insemination
Pregnancy rates
Holstein cows
Ovulation
Synchronization
Protocol
Gnrh
Follicle
Cattle
Insert
Bos
Yayın Tarihi: Ara-2012
Yayıncı: Elsevier Science
Atıf: Yılmazbaş, M. G. vd. (2012). "Effects of presynchronization with gonadotropin-releasing hormone-prostaglandin F-2 alpha or progesterone before Ovsynch in noncyclic dairy cows". Journal of Dairy Science, 95(12), 7186-7194.
Özet: The aim of this study was to evaluate the efficiency of presynchronization with GnRH and PGF(2 alpha) or with progesterone on overall Ovsynch (OVS) outcomes in noncyclic dairy cows. Cows were scanned 7 d apart with ultrasonography to determine cyclicity. Noncyclic cows (n = 281; no corpus luteum on ovaries at both examinations) were randomly divided into 3 groups. In the GP group (n = 108), the cows received GnRH and PGF(2 alpha) (PGF) administrations 7 d apart, and OVS was started 11 d after PGF (GnRH-7 d-PGF-11 d-OVS). In the P4 group (n = 90), the cows were treated for 7 d with an intravaginal progesterone (P4) implant (PRID), and then OVS was started 11 d after removal of the implant (7 d PRID-11 d-OVS). The control group (CON, n = 83) did not receive any presynchronization, and OVS was started at the same time as in the other groups (18 d-OVS). The percentage of cows that became cyclic at the beginning of OVS was lower in the CON group (38.6%; 32/83) than in the presynchronization groups (66.7%, 72/108 in GP; 71.1%, 64/90 in P4). The response to the first GnRH of OVS did not differ among groups (63.9%, 53/83 in CON; 67.6%, 73/108 in GP; 63.3%; 57/90 in P4), and synchronization rates were similar among the groups (74-82%). The cows that responded to presynchronization treatments (GP or P4) had higher pregnancy per artificial insemination (P/AI) than did nonresponding cows. Pregnancy per AI at 31 d did not differ between groups (30.1%, 25/83 in CON; 43.5%, 47/108 in GP; and 35.6%, 32/90 in P4). However, CON cows (24.1%, 20/83) had lower P/AI at 62 d than GP cows (41.7%, 45/108). Embryonic loss was higher in CON (20%, 5/25) compared with the P4 group (3%, 1/32). The administration of GnRH followed by PGF or exogenous progesterone (PRID) similarly increased the percentage of cows that became cyclic before Ovsynch in noncyclic cows, but fertility did not improve. However, the cows that responded to presynchronization had higher fertility rates than the nonresponding cows.
URI: https://doi.org/10.3168/jds.2012-5920
https://www.sciencedirect.com/science/article/pii/S0022030212007163
http://hdl.handle.net/11452/26297
ISSN: 0022-0302
1525-3198
Koleksiyonlarda Görünür:Scopus
Web of Science

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