Improved embryo survival following follicular drainage of subordinate follicles for twin pregnancy prevention in bi-ovular dairy cows

• Hoofdauteurs: Irina GARCIA-ISPIERTO (Auteur), Fernando LÓPEZ-GATIUS (Auteur)
• Formaat: Boek
• Gepubliceerd in: The Society for Reproduction and Development, 2019-11-01T00:00:00Z.
• Onderwerpen: article
• Online toegang: Connect to this object online.
• Notes: 0916-8818; 1348-4400; 10.1262/jrd.2019-065
• Keywords: double ovulation; follicular co-dominance; ovulation failure; simplified transvaginal device; Reproduction; QH471-489; Internal medicine; RC31-1245
• Source: The Journal of Reproduction and Development, Vol 66, Iss 1, Pp 93-96 (2019)

To prevent twin pregnancies in cattle, a simple transvaginal device can be used for follicular drainage. This study examines embryo survival following follicular drainage of the smaller pre-ovulatory follicle at timed artificial insemination (AI) in cows with a pre-ovulatory follicle in each ovary. The study groups established were a control group of 289 monovular cows, a non-drainage group of 114 bi-ovular cows and a follicular drainage group of 113 bi-ovular cows. All cows undergoing drainage developed a corpus luteum (CL) in the drained ovary. Pregnancy loss was recorded 56 days post-AI in 19.5% of the 149 cows that became pregnant. Pregnancy loss in the drainage group cows not suffering heat stress (3.8%) was significantly lower (P < 0.05) than in control non-heat stressed cows (20.9%) and heat-stressed non-drainage group cows (25%). Results indicate that CL induction by follicular drainage for twin pregnancy prevention may reduce the incidence of pregnancy loss.