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

摘要

The objective of the present work was to establish a relationship between daily herbage intake (DHI), daily milk production (DMP) and the height of marked individual tillers in paddocks grazed by dairy cows. The trial was carried out at the Station deRecherche sur la Vache Laitiere (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.