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108 FACTORS AFFECTING PREGNANCY RATES IN RECIPIENTS RECEIVING IN VITRO-PRODUCED EMBRYOS BY FIXED TIME EMBRYO TRANSFER
- Source :
- Reproduction, Fertility and Development. 28:184
- Publication Year :
- 2016
- Publisher :
- CSIRO Publishing, 2016.
-
Abstract
- A retrospective analysis of factors that affect pregnancy rates from 4214 fresh in vitro-produced (IVP) embryos that were transferred at a fixed-time (FTET) in 20 different farms. Recipients were all cycling cows or heifers that were synchronized with 1 of 3 treatments: 1) treatments with progesterone (P4) devices and 2 mg of oestradiol benzoate (EB) on Day 0 (day of insertion) and 24 h after device removal (Day 8); 2) treatments with P4 devices and EB on Day 0, but with 0.5 mg of oestradiol cypionate (ECP) at device removal (Day 8); or 3) treatments with P4 devices and GnRH on Day 0 and a second GnRH 60 h after device removal (Day 5). Cows in all treatment groups also received 500 µg of cloprostenol (prostaglandin F2α) at the time of P4 device removal and 400 IU of eCG either at device removal or 3 days before device removal. All embryos were transferred 7 or 8 days after the expected time of oestrus (24 h after EB, 48 h after ECP or at the time of the second GNRH for each synchronization treatment, respectively). On the day of embryo transfer, recipients were examined by ultrasonography and those with corpus luteum >14 mm in diameter received a fresh, IVP embryo in the uterine horn ipsilateral to the corpus luteum. Pregnancy rates were determined by ultrasonography 35 days after FTET. Data were analysed by logistic regression. Independent variables were classified into the following three categories. 1) Factors related to the recipient and the environment; there were no significant differences in pregnancy rates for corpus luteum diameter (≥14 and
- Subjects :
- Estrous cycle
medicine.medical_specialty
Pregnancy
Embryo culture
Reproductive technology
Biology
medicine.disease
Embryo transfer
Andrology
Endocrinology
medicine.anatomical_structure
Reproductive Medicine
Internal medicine
Lactation
Genetics
medicine
Animal Science and Zoology
Folliculogenesis
Molecular Biology
Corpus luteum
Developmental Biology
Biotechnology
Subjects
Details
- ISSN :
- 10313613
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Reproduction, Fertility and Development
- Accession number :
- edsair.doi...........dedebaea3e37d20462ef2fa09b55a42f