Influence of factors related to embryo transfer on the conception rates ((own compilation based on: 1Ledgard et al_ [43], 2Roper et al_ [16], 3Jaśkowski JM et al_ [49] 3Del Campo et al_ [13], 4Jaśkowski BM et al_ [46]
| FACTOR | CR |
|---|---|
| Asynchrony1 | |
| − 48h (5d) | 25% |
| none (7d) | 30% |
| + 48h (9d) | 40% |
| Embryo transfer difficulty2 | |
| Easy | 43% |
| Moderate | 32% |
| Difficult | 18% |
| TTIGP3 | |
| 10–60s | 53.4% |
| > 60 s | 20.4% |
| Depth of embryo deposition2 | |
| Deep in the horn | 43% |
| In the middle part of uterus horn | 31% |
| In the uterus body | 24% |
| Localization of the CL relative to the follicle3 | |
| Ipsilaterally | 65% |
| Contrlaterally | 33% |
| Structure of corpus luteum4 | |
| Cavitary CL | 52% |
| Compact CL | 33% |
Effects of factors related to in vivo or in vitro embryo production on conception rates (own compilation based on: 1Pontes et al [5], 2Ferraz et al [6], 3Donaldson et al [21], 4Arreseigor et al [20], 5Mikola et al [24], 6De Sousa et al [30])
| FACTOR | CR FOR THE TRANSFER OF EMBRYOS PRODUCED IN VIVO | CR FOR THE TRANSFER OF EMBRYOS PRODUCED IN VITRO |
|---|---|---|
| Embryo production method1 | 41.5 | 33.5 |
| Embryo quality2 | ||
| Excelent | 42.2 | |
| Good | 32.8 | |
| Sufficient | 23.7 | |
| Embryo development stage2 | ||
| Morula | 36.5 | |
| early blastocyst | 38.1 | |
| Blastocyst | 45.3 | |
| Embryo breed3,4 | ||
| Brangus3,4 | 47 | 36.8 |
| Angus3,4 | 39 | 32.9 |
| Nelore4 | 36.7 | |
| HF4 | 22.7 | |
| Hereford3 | 75 | |
| Charolaise3 | 53 | |
| Storage method2 | ||
| Fresh | 49.3 | 39 |
| Frozen | 36.8 | 32.9 |
| Sorting process5 | ||
| Sorter | 40 | 37.3 |
| not sorter | 48.7 | 42.3 |
| Biopsy6 | ||
| Biopsied | 54.2 | 26.4 |
| not biopsied | 55.9 | 19.8 |