
The Master Breeder Award is presented to an AJCA member, family, partnership or corporation that has bred outstanding animals for many years and thereby made a notable contribution to the advancement of the Jersey breed in the United States.
Since 1980, Jeff and Alta Mae Core have been breeding award-winning Jerseys. They have bred 238 cows appraised Excellent-90% or higher. The highest being, KCJF Regency Treasure, Excellent-97%, just one of seven in breed history to receive this honor. “Treasure” is sired by both a Keightley-Core bred dam and sire, Renaissance Kims Regency.
Many of their best performers include a sprinkling of KCJF sires on both the top and bottom sides of the pedigree. Among the cows who can be found in the lineage of much of the herd today is the early influencer, K.J.F. Amandas Mercury Mandy, Excellent-93%. Her son, Mandys Patrick Rex, born in May 1987, was the first bull bred and sampled by the Cores. He has 137 daughters in his proof, including Rexs Patrick Kim, Excellent-94%, an All American honoree with nine complete lactations, and the dam of four-time All American Junior Show Champion, KJF Renaissance Lacy {6}, Excellent-96%.
Keightley-Core Jerseys have been named Premier Breeder seven times and Premier Exhibitor twice at the National All-American Jersey Show. Additionally, they have bred one national champion, have exhibited the national champion three times, exhibited the Genomic Jersey Performance Grand Champion in 2020 and 2021, bred three National Jersey Jug Futurity winners, and won the 2021 Leading Lifetime Production Award.
The Cores have been active with the Kentucky Jersey Cattle Club and the Kentucky National Show and Sale. Alta Mae served on the Kentucky Fair Council and retired from the Kentucky Department of Revenue, in 2008, after 30 years of service. The Cores are both active cattle judges, having worked cattle shows in the United States and internationally. Alta Mae has served as a judge in Argentina, Brazil, Coasts Rica, New Zealand, Northern Ireland, and Scotland, as well as at the Royal Agricultural Fain in Toronto, Canada, and International Dairy Week, Australia. The couple have both won the Klussendorf Trophy, an award given for ability, character, friendliness and outstanding showmanship at the World Dairy Expo.
The American Jersey Cattle Association was organized in 1868 to improve and promote the Jersey breed. Since 1957, National All-Jersey Inc. has served Jersey owners by promoting the increased production and sale of Jersey milk and milk products. For more information on its programs and services, visit www.USJersey.com or call 614/861-3636.

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