Details

Autor(en) / Beteiligte

• Lee, Jihwan
• Lee, Songjeon
• Ryu, Gyeonglim
• Kim, Doosan
• Baek, Hyeong-uk
• Kim, Joohwan
• Lee, Kyungsuk
• Kim, Sunkyu
• Kim, Sangbum
• Dang, Chang-gwon
• Choi, Taejeong
• Choi, Inchul

Titel

A retrospective analysis of conception per embryo transfer in dairy cattle in South Korea

Ist Teil von

• Theriogenology, 2024-09, Vol.226, p.363-368

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The bovine embryo production industry has seen significant growth over the past two decades, particularly in the production of in vitro produced embryos. This growth, driven by advancements in cryopreservation, in vitro culture mediums, ovum pick-up (OPU) procedures, ultrasonography devices, and embryo transfer (ET) has been notable. Particularly, ET is crucial for disseminating high genetic merit and amplifying foreign breeds by importing frozen embryos. This retrospective study aimed to assess factors affecting conception per embryo transfer (CPET) in Holstein-Friesian cattle in South Korea from October 2008 to July 2022. We evaluated type of embryo breed, type of embryo production (fresh and frozen; in vitro and in vivo production), recipient conditions including estrus type, corpus luteum quality, parity (nulliparous heifers, primiparous, and multiparous cows), and the daily mean temperature-humidity index (THI) as an index for heat stress. Type of embryo breed and estrus had no significant impact on CPET. However, we observed higher CPET in recipients with good quality corpus luteum, nulliparous heifers, and surrogates receiving fresh in vitro and frozen in vivo embryos. Importantly, CPET was not adversely affected by mild heat stress conditions (up to daily mean THI 76), indicating that using frozen in vivo embryos produced by multiple ovulation embryo transfer and fresh in vitro embryos by OPU-ET can help alleviate the subfertility issues in dairy cattle caused by global warming in Korea. •Recipient parity and corpus luteum were significant determinants of conception per embryo transfer (CPET) in Holstein cattle•The temperature-humidity index, a measure of heat stress, did not significantly affect CPET.•Embryo type significantly influenced CPET,•Selecting recipients by parity and CL quality is crucial for ET success, offering an effective AI alternative in heat-stressed environments.