The Warren today

The Warren is the result of many years of balanced breeding, with the focus on the performance in alternative housing systems (organic, free range, wintergarden and barn). The Warren is slightly larger framed with all the advantages of modern hybrid egg quality, productivity and performance. Resilient and well behaved, no matter what it encounters the Warren is ready for the rigors of the range. Selection of the Warren chickens is focused on behavior, excellent feather cover and stress hardiness. The genetic lines that are behind the Warren are also intensively tested in our research and breeding centers in Western Europe.

The Warren laying hens are characterized by their robustness in combination with the advantages in terms of egg quality, egg laying persistency and livability. Overall, the Warren birds are rustic and docile, with excellent nest laying behavior,. The Warren laying hens meet the challenges of todays alternative egg production systems.

- Bred with free range producers in mind

- Excellent behavior and resilience

- Excellent feathering


Heritage of the Warren

The Warren was the result of the breeding efforts of James J. "Jim" Warren Jr., Born Feb. 10, 1929, in North Brookfield, Mass., the son of James J. "J.J." Warren, a renowned poultry breeder, and Mary J. (Savage).
Jim Warren attended St. John's Preparatory School in Danvers, Mass.; class of 1947. Jim Warren graduated from the University of Massachusetts in 1951 with a Bachelor of Science in poultry science. He served during the Korean War, from 1951-1953. He was a first lieutenant in the 141st Tank Battalion (Heavy).
While at university, he introduced dominant white and silver genes into his father's Rhode Island Red chickens, resulting in the R.I. White (Dominant) strain. His work was the basis of the innovative autosexable salmon sex-link cross; and still today this Rhode Island White strain can be found in the parentage of more than 90 percent of all brown egg layers marketed worldwide!
Jim Warren managed the Warren poultry breeding companies until 1971 when they were purchased by DEKALB AgResearch Inc. As director of DeKalb's poultry research program for 17 years, and as geneticist of record for three white and brown egg products, he made significant contributions to the company's international marketing success. Over the years, Jim Warren was a member of many associations, among them the Massachusetts R.O.P. Breeders Association (president in 1956), the Massachusetts Poultry Association (president in 1957) and the Poultry Breeders of America (president in 1987). Jim was the author of the Breeding and Genetics chapter of American Poultry History (Volume II), 1996. He was elected to the American Poultry Hall of Fame in 1998. The Warren lines have been maintained, and selected for many decades, resulting in the Warren that we know today.


Laying Period 18-100 weeks
Livability 93 %
Age at 50% production 153 days
Peak production 94 %
Average egg weight 63.2 g
Egg number hen housed 445
Egg mass hen housed 28.1 kg
Laying Period 18-100 weeks
Average feed consumption 126 g/day
Feed conversion 2.55 kg/kg
Body weight 2116 g
Shell strength 4050 g/cm2
Shell color 15 Lab
Haugh units 80


Don Cameron Warren - Copy.jpg
Jim Warren in front of his famous Warren laying hen