Effects of supplemental progesterone using a CIDR insert on pregnancy per embryo transfer of dairy heifer recipients of embryos produced in vitro

Animal Reproduction Science
Melissa M Steichen, J E Larson

Abstract

The objective of this experiment was to evaluate effects of supplemental progesterone immediately following transfer of frozen-thawed, IVP embryos on P/ET. Holstein heifers (n = 452), allocated to nine transfer groups over time, were assigned to be embryo recipients in a completely randomized study from December 2016 to April 2017. All heifers were randomly assigned to one of two treatments: 1) control (CON; n = 212) with no further treatment, or 2) received a CIDR insert containing progesterone for 12 d, beginning on the day of transfer (D 7) and removed 12 d later on Day 19 (CIDR; n = 228). A subset of heifers were subjected to blood sampling on Day 7 (ET) and Day 19 (CIDR removal) to determine circulating concentrations of progesterone. Pregnancy was initially determined using a serum assay for pregnancy specific protein-B at approximately Day 40 after ET and confirmed a month later using trans-rectal ultrasonography. Overall, P/ET did not differ (P =  0.941) between treatment groups. At the initial pregnancy determination, P/ET differed (P =  0.007) among transfer groups. Concentrations of progesterone tended to be less (P =  0.064) in heifers in the CON group compared to heifers treated with the CIDR (3.6 ± 0.27 compared w...Continue Reading

References

Nov 1, 1988·Journal of Reproduction and Fertility·J E GarrettG L Morgan
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May 28, 1983·The Veterinary Record·J M Sreenan, M G Diskin
Feb 28, 2001·Reproduction : the Official Journal of the Society for the Study of Fertility·G E Mann, G E Lamming
Nov 4, 2005·Theriogenology·Peter W FarinCharlotte E Farin
Feb 9, 2017·Theriogenology·Regivaldo Vieira de SousaMaurício Machaim Franco
Jan 1, 2016·Reproduction, Fertility, and Development·P Blondin

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