Transitioning livestock onto brassicas

Clean, fresh stock water must be available for brassica-fed animals at all times.

DRYSTOCK TRANSITIONING TO BRASSICAS

The first two weeks:

  • A full rumen is required before animals are shifted onto crops - especially cattle. Fill up with pasture and/or baleage, silage, hay and/ or straw
  • Remove animals from crop after 1-2 hours during the first few days and return to pasture
  • Ensure plenty of long-stem fibre supplements (baleage, silage, hay and/or straw) are available to stock when off crop
  • During transitioning, increase feed allocation of brassica crops in small 15-20% increments every two days, building up to a maximum allowance over at least 10-14 days
  • Once feed transition is complete, offer no more than 80% of the diet as crop for drystock
  • Feed at least 20% of the diet as good quality fibrous supplement or runoff pasture for non-lactating dairy cattle, beef cattle and sheep. Runoff pasture may not provide adequate fibre intake for cattle, therefore it is recommended that a quality fibre supplement is offered
  • Sheep and deer ideally need access to longstem fibre at 10-20% of the diet once fully transitioned to crop
  • The first 14 days while transitioning onto brassica crops is when most animal health challenges occur


TIPS:
  • ALWAYS dry matter (DM) yield brassica crops pre-grazing
  • Unknown DM yields = very difficult and risky transitioning
  • Feed testing labs give best crop DM% results; don’t use ‘book values’
  • Nitrate test sample at same time as DM% testing

LACTATING DAIRY COWS TRANSITIONING TO BRASSICAS

The first two weeks:
  • A full rumen is required before lactating dairy cows are shifted onto crops. Fill up with pasture and/or baleage, silage, hay and/or straw after milking. Once all cows have consumed pasture/supplements THEN start cows onto brassica crop
  • Start by grazing the crop for no more than 1-2 hours per day during the first few days, returning cows to a diet of pasture plus high fibre supplementary feeds
  • During the transitioning period, ensure plenty of long-stem fibre supplements (baleage, silage, hay and/or straw) are available to cows when off crop
  • Pasture plus brassica crop is a suitable complete diet for cows once fully transitioned onto brassica. Feed extra supplementary fibre during the transition period
  • During transitioning, increase feed allocation of brassica crops in small 15-20% increments every two days, building up to a maximum allowance over at least 10-14 days
  • Once feed transition is complete, offer no more than 35% of the diet as crop for lactating cows, due to risk of brassica milk taint

Crop area allocation