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Vache Laitibre (INRA), St Gilles during the spring of 1988 and 1989. Six paddocks of vegetative Lolium perenne were grazed for five days by six lactating dairy cows. DHI was measured by means of chromic oxide to estimate faecal output and milk production was measured routinely twice daily. The extended height of the topmost leaf (ETH) and leaf sheath (ESH) of 100 (1988) or 250 (1989) marked tillers were measured from ground level before, each day during and after grazing. The daily herbage allowance (DHA) was on average 26 kg OM/cow/d (between 23 and 34 kg OM/cow/d) calculated on the basis of the herbage mass measured to ground level (HM) and the area allotted per cow. Mean pregrazing HM was 4693 kg OM/ha (range 3700 and 6000 kg OM/ha), ETH was 296 mm (range 225 and 380 mm) and ESH was 104 mm (range 83 and 135 mm). Mean postgrazing HM was 3167 kg OM/ha, ETH was 117 mm and ESH was 85 mm. Maximum DMP in a period varied between 21.7 and 24.8 kg/cow/d and estimates of maximum DHI between 16.4 and 19.7

The dynamics of daily milk production and sward height under paddock grazing conditions