Traditional vs modern: role of breed type in determining enteric methane emissions from cattle grazing as part of contrasting grassland-based systems.

Pasture type had a highly significant effect on live-weight gain (s.e.d. = 0.08 kg d −1 ; P <0.001), which was just over 1 kg d −1 when grazing the lowland ryegrass sward, but less than 0.35 kg d −1 when grazing the hill sward ( Fig. 1 ).

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