Groups of high and low fecundity Booroola x Romney (B x R) and Romney (R) two-tooth ewes grazed a pasture containing 85% 'Grasslands Pawera' red clover for 10 days; similar groups of ewes grazed ryegrass- white clover control pastures. Oestrus and ovulation were synchronised in all ewes to occur during the last 5 days of grazing. Pawera leaf material contained 0.7% formononetin and the pasture was highly oestrogenic to sheep (>40

KP, McNatty, K Ball, N Hudson, M Gibb, and DC Thurley

Proceedings of the New Zealand Society of Animal Production, Volume 42, , 21-24, 1982
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