Ch. 9 — Advances in Reproductive Biology and Their Effects on Animal Improvement • 175 
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Figure 33.— The Way the Reproductive Technologies Interrelate 
N 
Recovered 
embryos 
Q o 
o 
Sexed? 
Frozen? 
Recipient herd: synchronized estrus 
Embryo transfer 
Each get two for twinning 
Calves 
Photo Credit: Science 
These 10 calves from Colorado State University were the 
result of superovulation, in vitro culture, and transferto 
the surrogate mother cows on the left. The genetic 
mother of all 10 calves is at upper right 
SOURCE: Office of Technology Assessment, 
