These can range from land availability and suitability to the type of crop and animal to be fed. The sowing dates for many of these crops has already passed or is approaching fast, as shown in Table 1 below. There are still limited opportunities for farmers to plant kale, with more opportunities for rape and stubble turnips or a kale/rape hybrid.

These crops can be used to graze animals over the winter and help conserve limited fodder supplies. Also, in the case of lambs and ewes especially, they can be used to help finish lambs.

The advantages and disadvantages of each crop, and other relevant considerations, are summarised below.

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Managing and grazine forage crops

  • All forage crops are low in fibre and, as such, require animals to be supplemented. The general recommendation is to supplement about 25% of the diet with a fibre source.
  • Placing bales of silage or wrapped hay/straw strategically in the field will reduce soil traffic damage and compaction in the winter.
  • Mineral supplementation is required. Crops are low in magnesium, copper and iodine.
  • Introducing animals slowly and strip grazing is the preferred grazing method.
  • Variable in terms of labour needs.
  • Forage rape

    Advantages

  • Can be sown later in the year eg. after a crop of winter barley, a wholecrop cereal or a late silage harvest.
  • Suitable for finishing lambs.
  • Known to take in a rougher seedbed and acts as a good crop to break up marginal grassland.
  • More suited to young stock than kale.
  • Disadvantages

  • Lower crop yield potential.
  • Less winter hardy and ideally should be grazed by the end of year.
  • Needs decent soil fertility.
  • Forage kale

    Advantages

  • Little to no specialised equipment required.
  • Relatively easy to manage and graze.
  • It can be planted in late spring, thus allowing early grazing of grassland or silage harvesting before sowing.
  • Disadvantages

  • Needs rotation as consecutive growing will leave it susceptible to club root (a yield-robbing root disease).
  • May need active management in terms of herbicide and insecticide.
  • Planting after mid-June reduces yield potential.
  • Only suitable for dry free-draining soils as normally grazed in situ.
  • Forage turnips

    Advantages

  • Like rape, provides a source of winter dry matter after a relatively short growing period, compared to Swedes.
  • Can be grazed in-situ or supplemented to animals.
  • Need decent soil fertility.
  • Can be sown later in the season meaning area is out of production for shorter timeframe.
  • Disadvantages

  • Utilisation can suffer if sown in heavy soils and more suitable to sheep than cattle.
  • More prone than swedes to frost damage.
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    Low-cost wintering options