| http://www.w3.org/ns/prov#value | - to serve as a substitute cor- 1s luteum in those animals in which the natural corpus teum may spontaneously regress until such time as ose in the refractory first 4-5 days of the cycle have ached the stage at which their corpora lutea are susptible to a luteolytic agent, followed by a substance fective in causing luteal regression.
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