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AGS 104—A New Rye Cultivar for Winter Forage and Silage Production

Ann Blount, Ronald Barnett, Jerry Johnson, Cheryl Mackowiak, and Yoana Newman

AG 104 is an early winter rye cultivar that was co-developed by the University of Florida and the University of Georgia for early season forage production, which suits various livestock operations.

The average rye season lasts from December through April in the southeastern United States. While some rye cultivars produce early-season forage, others are typically late in the season. During the course of the growing season, several rye cultivars may be blended or broad-based populations may be used to produce tonnage fairly evenly.

Rye production is required more in December, January, and February than in March and April by southeastern livestock producers. Typically by mid-April, the summer perennial grasses appear from dormancy and begin to grow. Earlier rye growth accelerates the winter grazing period where early forage production is desirable. It is particularly useful for dairy silage operations where cool-season forages are followed by early-planted corn.

In 1996, AGS 104 (tested experimentally as: FLPL97P20) was created from an equal mixture of five strains that were developed in Griffin, GA:

  • Strain 1 = Bates, WALC7, and Florida 401
  • Strain 2 = Maton, WALC7, and Florida 401
  • Strain 3 = Oklon, WALC7, and Florida 401
  • Strain 4 = NF 73, WALC7, and Florida 401
  • Strain 5 = BR1, WALC7, and Florida 401

This mixture was selected throughout 1998 to 2001 (four cycles of selection) in Quincy, FL. Bates, Maton, Oklon, and NF 73 were developed by the Samuel Roberts Noble Foundation. The BR1 is a rye from Brazil. The WALC7 is a selection developed from Wrens Abruzzi, and it was released as Wrens 96. Good forage production, disease resistance, and high-seed yield were used as selection criteria for advancing each cycle.

AGS 104 has performed well in variety trials throughout the southeastern United States, particularly for early season forage production. It also performed well in blends with annual ryegrass for long-season forage production. AGS 104 most closely resembles Wrens 96, but AGS 104 is slightly shorter and earlier. AGS 104 has good leaf rust resistance.

AGS 104 was released exclusively to AgSouth Genetics for marketing.

Publication #SS AGR 278

Release Date:January 18, 2017

Reviewed At:February 4, 2022

Related Experts

Newman, Yoana Cecilia

University of Florida

Mackowiak, Cheryl L.


University of Florida

Blount, Ann R. Soffes

University of Florida

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About this Publication

This document is SS AGR 278, one of a series of the Agronomy Department, UF/IFAS Extension. Original publication date October 2007. Revised November 2013. Visit the EDIS website at for the currently supported version of this publication.

About the Authors

Ann Blount, professor, Agronomy Department, UF/IFAS North Florida Research and Education Center; Ronald Barnett, emeritus professor, Agronomy Department, UF/IFAS NFREC; Jerry Johnson, University of Georgia; Cheryl Mackowiak, associate professor, UF/IFAS NFREC; and Yoana Newman, assistant professor, Agronomy Department; UF/IFAS Extension, Gainesville, FL 32611.