Here's a link to a New York Times article from April 25, 1967. The article with picture appeared on page 45. Newsletter Editor Peter Hansen found this story of a Margaret Hansen, apparently no relation, who went as a Peace Corps volunteer to Nigeria some 57 years ago with heifers. It was an experiment to determine if U.S. cattle would survive in Nigeria. No followup story, or the further history of Margaret, is available. The link to the story is here: https://nyti.ms/3lFJ0h3
Copyright rules prohibit us from republishing the story, but you are welcome to find this through the Times' archive, which may require a subscription. Life is not always easy, but it is usually possible.