Remember that this technology does not cover the full gestation period. It only works starting at the edge of viability.

In order for an extremely premature lamb to end up in one of these bags, either preterm birth must be induced, or surgery must take place. Neither of those options is low-cost or without the potential for significant complications. You would likely end up with high rates of mortality and morbidity, and even if the BioBags were able to successfully sustain the animals, they would probably never be considered suitable for anything other than research.

There may come a day when a BioBag is able to cover the full gestation period, but even then, I highly doubt that it would be cheap enough for use with livestock.