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Grazing multispecies swards improves ewe and lamb performance.

C Grace1, M B Lynch1, H Sheridan1

  • 11School of Agriculture and Food Science,University College Dublin,Belfield, Dublin-4 D04 V1W8,Ireland.

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Grazing diverse, multispecies pastures improved sheep and lamb growth and body condition. These improved pastures also reduced the need for chemical dewormers, indicating better animal health and reduced reliance on medication.

Keywords:
average daily gainfaecal egg countsgrass legume and herb swardsperennial ryegrasssheep

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Area of Science:

  • Animal Science
  • Agronomy
  • Ecology

Background:

  • Monocultures of perennial ryegrass (PRG) are common in sheep production.
  • Diverse swards may offer enhanced nutritional and ecological benefits for livestock grazing systems.

Purpose of the Study:

  • To compare ewe and lamb performance on a perennial ryegrass-only sward versus diverse multispecies swards.
  • To evaluate the impact of sward diversity on animal health and productivity.

Main Methods:

  • A two-year study compared four sward types: PRG, PRG with white clover (PRGWC), a six-species sward (6S), and a nine-species sward (9S).
  • Ewes and lambs were rotationally grazed, with performance metrics including live weight, body condition score (BCS), and lamb faecal egg counts (FEC) recorded.
  • Lambs were drafted for slaughter at 45 kg, and anthelmintic treatments were administered when mean FEC exceeded 400 eggs per gram.

Main Results:

  • Ewes on 6S and 9S swards exhibited significantly heavier live weights and BCS compared to those on PRG.
  • Lambs grazing the 6S sward were heavier at 14 weeks old than those on other swards.
  • Lambs on PRG required more days to reach slaughter weight, and lambs on 6S and 9S swards needed fewer anthelmintic treatments.

Conclusions:

  • Multispecies swards significantly enhance ewe and lamb performance, leading to improved growth rates and body condition.
  • Grazing diverse pastures reduces the reliance on chemical anthelmintics, contributing to more sustainable livestock management.
  • Incorporating diverse plant species into pastures offers a viable strategy for improving animal health and productivity in sheep farming.