Fig. 1
Possible causes of repeat breeding
Table 1
Conception rate in repeat breeder cows after AI or ET
| Author | Conception rate | Comments | |
|---|---|---|---|
| AI | ET | ||
| Tanabe et al. 1985 (65) | - | 70% | fresh embryos transferred surgically |
| Rodrigues et al. 2007 (52) | 17.9% | 41.7% | frozen-thawed embryos |
| Son et al. 2007 (61) | heat 7.7% vs TAI 18.5% | 53.8% | frozen-thawed embryos; TET with CIDR and EB |
| Dochi et al. 2008 (16) | 20.4% | 41.5% | frozen-thawed IVF embryos following AI |
| Block et al. 2010 (7) | TAI 31.3% | 50.5% vs 27.7% | fresh embryos vs vitrified embryos (in vitro); TET |
| Rodrigues et al. 2010 (53) | - | 42.9% vs 38.2% | frozen-thawed embryos; TET with norgestomet implant and eCG (cows with or without CL on day 0 of the protocol) |
| Canu et al. 2010 (11) | 30.0% | 52.6% | frozen-thawed embryos (92%) and fresh embryos (8%) following AI after natural heat |
| Yaginuma et al. 2019 (71) | - | 46.9% | frozen-thawed IVF embryos following AI |