Male meadow voles can be genetically altered to remain with a female he mated with by increasing ____ levels.

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Increased levels of vasopressin have been shown to increase partner preference in male meadow voles, causing them to remain with the female they mated with. This has been demonstrated through genetic manipulation as well as through administration of vasopressin directly to the brain.

Male Meadow Voles Can Be Genetically Altered to Remain with a Female