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Comparison of Reproduction Data for Dairy Animals Used to Produce Biopharmaceutical Products by Transgenesisa
| Goat | Sheep | Cow | |
|---|---|---|---|
| Seasonal breeding | Yes | Yes | No |
| Number of one-cell embryos | 1–3 | 1–3 | 1 |
| Number of one-cell embryos (superovulated) | 4–8 | 4–10 | 3–6 |
| Gestation time (months) | 5 | 5 | 9 |
| Rate of transgenic births (%) | 5–10 | 5–10 | 5–10 |
| Litter size | 1–2 | 1–2 | 1 |
| Time to sexual maturity (months) | 6–8 | 6–8 | 15 |
Data in part from Clark et al. (1987).
