Base AR37

tetraploid perennial ryegrass

  • Bred in Australia from drought surviving plants
  • Ideally suited for dairy and beef farming
  • Excellent late season quality feed
  • Very high tiller density and high dry matter production
  • Insect control from AR37 endophyte
  • AR37 endophyte assists with post-drought recovery
  • AR37 endophyte has no Ergovaline and may increase milk production
  • The top performer in Dairy Austrlia's Forage Value Index 2022 update
  • Sowing Rate 20-30
  • Heading Date Very Late
  • Days to Grazing From 55 To 85
  • Growing Seasons Autumn, Spring, Summer, Winter
  • Grazing Seasons Spring, Summer, Autumn, Winter
  • Grazing Method Rotational Grazed – Long Term
  • Tetraploid/Diploid Tetraploid
  • Rainfall Minimum 650mm per annum
  • Pasture Life 5 years+
  • Soil Fertility High (Olsen P 20+)

Top performer in Dairy Australia’s FVI for 5 consecutive years - Australian bred for Australian conditions

Base is a late maturing tetraploid perennial ryegrass available with AR37 endophyte. Base offers superb dry matter yield meaning more feed is available for your stock. An added feature of Base is its high seasonal production in autumn and winter. It also responds well to summer rainfall, providing growth when moisture and fertility are available. Well established in the dairy sector and seen as a leading option by beef and sheep farmers, Base AR37 kicks goals for Australian farmers 

Being a tetraploid perennial ryegrass, Base AR37 has greater palatability and digestibility than normal diploid type ryegrasses which results in a pasture that is more readily accepted by stock. This increased animal acceptance and quality of Base AR37 combined with its erect growth habit can improve animal intake and performance.

Base AR37 in Lance Creek Victoria (Wonthaggi).

Leigh Weston (Victorian farmer) and Jake Frecklington (DLF Seeds Sales Agronomist) discuss the benefits of sowing Base AR37 in a Dairy operation. "Base suits our farm and our management style. When the cows come in here, you will get another litre or two in the vat, theres no doubt about it." Explains Leigh.

PGG Wrightson Seeds Base AR37 perennial ryegrass pasture seed has again come out on top of Dairy Australia’s latest Australian Forage Value Index (FVI).

The FVI rating system helps Australian dairy producers make better-informed decisions when choosing a perennial ryegrass cultivar. It provides an accurate, reliable and independent assessment of the potential economic benefit of perennial ryegrass cultivars in different dairy regions of southeast Australia. 

The FVI is calculated by multiplying a cultivars dry matter performance value (PV) by its economic value (EV), and Base AR37 perennial ryegrass topped the rankings across all four areas tested in Southwest Victoria, Gippsland (VIC), Northern Victoria and Tasmania. Find out more about Dairy Australia's FVI here


Pasture Seed Breeding: Base AR37

Base AR37 was selected from high yielding, densely tillered plants that survived two years of severe drought and hard sheep grazing.
These selections were undertaken at our Maryborough (Vic) and Hamilton (Vic) trial sites which were sown in 2004. The surviving plants
were transplanted to our Research Station in Ballarat where further screening and evaluation took place.

The finished cultivar was then inoculated with the endophyte AR37 to enhance persistence against a wide variety of insects.

Sowing and establishment

Base AR37 tetraploid perennial ryegrass should be sown at rates between 20-30kg/ha. It can be easily mixed with either other ryegrasses or, because it is a tetraploid, makes for a great companion with clovers and/or herbs. This will ensure a balanced pasture diet that offers high quality feed for beef, sheep and dairy.

Sowing depth is important as is the seed to soil contact, given that Base AR37 is a small seed. Ensure that the depth of sowing is between 5 and 15mm for optimum establishment rate and early vigour. If the seed is sown too deep, then the seed will be delayed in its establishment which then has an impact on other important management decisions such as weed control and timing, insect pest. 

For pasture seed sowing rates specific to your farming needs, contact your local Sales Agronomist here

Grazing management

Base AR37 tetraploid perennial ryegrass

Base AR37 will produce more dry matter and will persist longer under rotational grazing management. Avoid hard set stocking during periods of stress such as droughts or periods of low fertility. 

Although to date no incidences of AR37 related staggers in cattle has been reported it is possible sheep could be affected, however trials have demonstrated that on average the duration as well as severity of ryegrass staggers is less than for standard endophyte.

To date AR37 has been trialled with sheep and cattle exclusively. Other classes including horses should not consume forage containing AR37 endophyte.


Minimum 650mm rainfall per annum unless irrigated

We’ve averaged an extra 400 or 500 grams weight per day from the start of June to mid-September, compared with the paddocks without Base AR37. The return far outweighs the initial cost.

Share this page