Surrogates: how they arechosen and cared for.

Somatic cell nuclear transfer, the technique behind cloning, produces an early embryo, not an animal. That embryo has to be carried to term by a female of the same or a closely related species, in a uterus prepared to receive it. There is no shortcut around this. Artificial wombs for mammals do not exist outside experimental settings, and none are used in clinical cloning anywhere. The surrogate is therefore not a formality on a form; she does the entire second half of the work.

This is worth saying plainly because some clients arrive expecting the process to end at the laboratory bench. It does not. An embryo transferred into a surrogate has to implant, has to be carried through a normal gestation, and has to be delivered – by natural birth or caesarean section, depending on species and circumstance – with the same risks and the same uncertainties as any other pregnancy in that species. A genetic twin is only produced at the end of that full biological process, not before it.

Surrogates are chosen from healthy adult females of proven reproductive history where possible, screened for infectious disease, reproductive soundness and, for dogs and cats, temperament suited to whelping or queening without excess stress. For camels and horses, additional criteria apply: prior successful pregnancies, sound conformation, and freedom from conditions that complicate gestation in large animals. We do not use an animal whose own health could be put at meaningful risk by carrying a pregnancy.

For species where surrogate availability is limited – camels in particular, given long gestation and specialised husbandry – timelines depend on when a suitable surrogate is in the right reproductive state. This is one reason camel cloning is quoted from $100,000 rather than as a fixed figure: the surrogate programme is part of the cost, and its timing is not always predictable to the week.

A surrogate is matched to the embryo by species and, where feasible, by size class, so that a full-term pregnancy and birth proceed within normal parameters for that surrogate's body. This is standard veterinary practice, not a Reem Bio invention; it is the same logic used in equine embryo transfer programmes worldwide.

Once a transfer is confirmed by pregnancy testing, the surrogate is monitored under standard veterinary protocols for her species: periodic examination, nutrition appropriate to gestation, and observation for the complications that attend any pregnancy, cloned or not. Recipients of nuclear transfer embryos have, in some studies, shown modestly higher rates of certain complications, such as elevated birth weight in cloned calves and lambs, and this is one reason careful veterinary oversight continues through to delivery and beyond.

After birth, the surrogate's role is usually complete, though in some programmes she also nurses the newborn through early weeks, exactly as she would her own offspring. Her welfare afterwards, including retirement from further surrogacy work once appropriate, is part of what a client is contracting for, even if it is rarely the part discussed first.

We do not promise a live birth from any given transfer, and we do not promise a particular timeline. Pregnancy loss occurs in nuclear transfer pregnancies at rates that vary by species and by laboratory, and it occurs in ordinary pregnancies too. A surrogate carrying a clone is, biologically, carrying a pregnancy like any other, with the ordinary range of outcomes that implies. What differs is the embryo's origin, not the rules of gestation.

This is part of why cloning is quoted as it is – cats from $65,000, dogs from $85,000, camels from $100,000, horses by consultation – rather than as a flat, guaranteed-outcome fee. The price reflects a programme of work: cell line preparation, oocyte handling, nuclear transfer, surrogate selection and care, pregnancy monitoring, and delivery. It does not reflect certainty, because certainty is not something a laboratory can sell honestly in a biological process.

The period immediately after birth is treated with the same seriousness as the pregnancy itself. A newborn produced by nuclear transfer is examined by a veterinarian at birth and monitored closely over its first weeks, since neonatal complications, where they occur in cloning programmes, tend to appear early rather than emerge later in life. This is standard practice in livestock and companion animal cloning generally, not a precaution unique to Reem Bio, and it is one reason a client should expect close veterinary contact in the first days after a successful birth rather than an immediate handover.

The surrogate herself is also monitored through this period for ordinary postpartum recovery – involution, lactation if she is nursing, and general condition – under the same veterinary oversight that applied through gestation. Once she has recovered and, where applicable, weaning is complete, a decision is made about whether she continues in the surrogate programme or is retired from further pregnancies, based on her age, health history, and number of prior pregnancies, following the same welfare thresholds used for any working breeding animal.

None of this is billed separately to the client as a line item; it is part of the programme of work described earlier, ending with a healthy, examined newborn handed over with its own veterinary record, not simply a birth announcement.

Clients considering cloning sometimes ask about the surrogate only after asking about the clone. We think the order should often be reversed. A pregnancy is a shared undertaking between a laboratory, a veterinary team, and an animal who did not choose to be part of it but whose health during the process is our direct responsibility. Being honest about that, before a contract is signed, is part of what distinguishes a careful programme from a rushed one.

If you are weighing cloning against preservation alone, it may help to read about what a genetic twin actually is and how it differs from the animal you knew, before deciding whether the surrogate process described here is one you want to begin.