The usefulness of a single measurement of insulin-like growth factor-1 as a predictor of embryo yield and pregnancy rates in a bovine MOET program

Theriogenology
M A VelazquezH Dobson

Abstract

The objective was to determine if a single measurement of plasma insulin-like growth factor-1 (IGF-1) could predict the number of viable embryos obtained from donors and the likelihood of pregnancy in recipients in multiple ovulation and embryo transfer (MOET) programs in cattle. The embryo yields from 101 embryo recoveries were examined in maiden Holstein heifers (n=75) and multiparous Holstein cows (lactating cows n=20, dry cows n=6). Donors were super stimulated with FSH and embryo recovery was done non-surgically 7 days after artificial insemination. Embryos were classified according to the IETS criteria. Pregnancy rates in 100 maiden Holstein heifer recipients were analysed. Recipients were on day 7+/-1 of the estrous cycle at transfer. Pregnancy diagnosis was carried out at day 30 (PD 30) and rechecked at day 60 (PD 60) after transfer. Blood samples from coccygeal vessels taken at the time of embryo recovery (donors) and transfer (recipients) were analysed for IGF-1, insulin, beta-hydroxybutyrate (beta-OHB), non-esterified fatty acids (NEFA), urea and cholesterol. There was a negative correlation between the number of viable embryos and insulin (r=-0.33, P=0.025) in donor heifers. In donor cows, the number of viable embry...Continue Reading

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Citations

Dec 17, 2009·Reproduction, Fertility, and Development·Roberto SartoriMilo C Wiltbank
Aug 28, 2010·Reproduction, Fertility, and Development·Danielle MonniauxHélène Larroque
Jun 17, 2011·Animal Reproduction Science·M A Velazquez
Aug 16, 2008·Domestic Animal Endocrinology·M A VelazquezD C Wathes
Jan 1, 2013·International Journal of Reproductive Medicine·C McRaeJ Fisher

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