Custom Heifer Raiser ‐ We Define Quality!

Meet Our Team

Who's On Our Team?

  • Family Managers: Marty & Mary Weiss and Bronson & Louise Weiss

  • Employees:

    Imperial - Juan Carlos Diaz and Humberto Rodriquez

    McCook - Shannon Stevens, Daryl Barnhart, Craig Adams, and Heather Collicott

In-House Breeder

JUAN CARLOS DIAZ grew up in the small community of Yuma Colorado and has had the opportunity to work in the dairy industry for 12 plus years. He started as a farm hand on a 600 cow dairy where he was able to grow along with the farm to becoming dairy manager and milking 2500 cows. Having started from the bottom he was able gain experience and knowledge in all the areas of dairy, from maternity and raising calves to treating sick cows and artificial insemination.

He understands succesfull nutrion and herd management practices at a calfs early age play a crucial role in the health and productivity of the cow. Juan is bilingual and possesses excellent reproductive, herd health, and nutritional skills. Juans passion for working with cows and his natural leadership skills paved the way for his success in the industry. Juan is ready to be a leader for your team and is eager to use his abilities and knowledge to bring success to your farm. His goal is to deliver quality, loyalty, and trust.

In his spare time Juan enjoys spending time with his family, wife Brenda Ivone, daughter Adahli (11), and sons Jadiel (7), and Liam (1). They are of Christian religion and are very involved with the community church Centre of New Hope. Juan also enjoys sports, fishing, and the outdoors.


SHANNON STEVENS is 45 years old. He is married to Kristin Stevens, and they have been married for 23 years. They have one daughter, Taylor Weber, who recently got married to their son-in-law, Abraham Weber.

Shannon grew up on a cow-calf farming operation, which led him down the path of working with cattle and judging livestock. He received his animal science degree from Fort Hays State University in Hays, Kansas, which led him to experience working in feedyards throughout the midwest, and also working at a beef heifer developing yard for a little over 18 years, which he really enjoyed.

Besides working with cattle, Shannon enjoy spending time with his family, which includes their dog, who is our 4-legged best buddy, and he also enjoy fishing all year round on the lakes in this area.


DARYL BARNHART grew up in St. Francis, KS, and graduated from Colby Community College with an Associate’s degree in Farm & Ranch Management. His career in the livestock industry has been spent in northwest Kansas at a few feedlots, as well as threeyears as a ranch manager.Before beginning with Marshland Acres, Daryl has been employed with Heartland Cattle Co. in McCook, NE, for the last 14+ years. His areas of expertise include low stress cattle handling and monitoring health of cattle, as well as care of horses.

Daryl & his wife, Yvonne, have two children. Their daughter,Morgan, and son-in-law, Clem, live in north central Kansas, and their son Trey is in high school. In his spare time, Daryl likes to watch football, read,& spend time with family.


CRAIG ADAMS grew up in Colby,KS, and graduated from Colby High School before going to Kansas State University where he received a degree in Animal Science and Industry specializing in Production Management. After college he moved back to northwest Kansas to work for Heartland Cattle Company in 2001. He worked in feedyards for them for about 5 years until he joined them at the heifer development facility in McCook, NE. He fit right in breeding and developing heifers ever since.

Craig and his wife Amanda have two daughters Haylee and Caitlyn who keep them busy with school sports and activities. Craig likes the outdoors hunting and spending time with friends and family in it.


HEATHER COLLICOTT grew up in McCook, Nebraska and graduated from McCook Community College with an associate’s degree in business administration. She worked in the banking industry for 15 years, doing customer service, investments, consumer and real estate loans. She continued her education in banking/finance throughout those years. She then began a daycare business for 5 years, after their youngest child was born so she could stay at home, and still earn an income for her family! After her youngest started kindergarten, she decided to go back to work, and has been the Children’s Minister Director at McCook Christian Church and working with Heartland Cattle Company for the past 7 years, working part time with both businesses, both jobs together have been the perfect fit for her family. At the church, she plans and organizes events for kids Preschool – 5th grade and at Heartland Cattle, she was responsible for office work, such as data entry for the heifer breeding reports, billing, posting feed for the heifers, filing, and helping with other various office duties that came about during the day to day operation, did some recording when working heifers outside, and was part of the chopping crew when putting up silage for feed.

Heather & her husband, Wes, have three children. Their oldest Taye, is a sophomore in college and is planning on being a middle school teacher and coach. He is employed with First Central Bank while attending Mid-Plains Community College, then will transfer to the University of Nebraska Kearny to finish his education. Kirstin, their daughter, is a Senior this year at McCook Senior High. Her plans are to attend Mid-Plains College or Fort Hays State, and go into early elementary education and becoming a Kindergarten or 1st grade teacher. Their youngest, Jalen, has just entered the Jr. High at McCook Schools, and is in 6th grade. In her spare time, she loves to go camping and spend time outside with the family, watch HUSKER football & volleyball, and spend time with family.

Select Sires Breeding Team

JAY HILL was raised on a high mountain cattle ranch in western Colorado. He attended Northeastern Junior College in Sterling, Colorado. After graduation in 1995, he started working for Colorado Cattle Services, an independent select sires distributer. He attended CSU with a major of Animal Science while working full time in the heavily beef area of eastern Colorado.

In 2000, Colorado Cattle Services sold to Cache Valley Select Sires, at which time he began servicing southwestern Nebraska. Over the last 15 years the business has evolved from a primarily beef tank delivery area into a beef technician area. In the last ten years the dairy business has grown to being the primary focus. He lives in Sterling, Colorado with his wife of 20 years Jill and their 3 boys Bryce, 17, Bryan, 15 and Brandyn, 13.


AARON SHIFLETT is a Reproductive Specialist for Select Sires Mid-America. Aaron grew up on a dairy and beef operation in the Shenandoah Valley of Virginia. He studied Dairy Science for two years at Virginia Tech before moving to Colorado in 2005 to work with a veterinarian who specialized in the management of reproduction on dairies. While working with this practice, he learned how to utilize ultrasound in the reproductive management of dairies as well as how to implement different synchronization protocols and breeding strategies.

While working with the veterinary practice he finished his undergraduate degree in Animal Science from Colorado State University. In 2011 Aaron began work as a herdsman at a dairy in Berthoud, CO, where he took care of the dairies breeding needs as well as employee management and fresh/sick cow responsibilities. In 2013 he started with Select Sires Mid-America and now works together with the sales staff, technicians, and clients in Colorado, Wyoming and Nebraska to best serve each client’s reproductive needs.

Senior Dairy Specialist

TIM THOMPSON is a Senior Dairy Specialist with Provimi – NA – a division of Cargill Premixes and has been with the company since 1995. He is responsible for Nutrition Tech support to their dealer network throughout Minnesota, Wisconsin, Iowa, North & South Dakota, Colorado, Texas, and Kansas. Currently, he services about 200,000+ cows on numerous herds – approximately 5-600 or so. He also works with 40-45 outside salesman/consultants and over sees their accounts. In addition, he personally handles the ration work to some 8000 cows and 6000 heifers on 18 herds.

He has played an intricle part in the development of the AAMPS program over the last 21 years, making it user-friendly as well as developing a true working model to be used to least cost diets in the field.

Over the last 10+ years, his responsibilities have included providing dairy nutrition and management tech support to one of the larger feed companies in Canada (Hi Pro Feeds) as well as the largest feed company in Japan (Feed One).

He is currently an active member of the American Registry of Professional Animal Scientists.