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Two trials were performed : the first with 10 primiparous and 10 multiparous dairy cows from the l7th to 26th weeks of lactation and the second with 5 primiparous and 5 multiparous dairy cows from the 28th to the 37th weeks of lactation. Both trials were conducted according to a Latin square design (5x5) ; periods of two week duration. Five supplementary doses of MetDl were tested : 0 (Ti 2.7 (T2), 5.5 (T3), 8.3 (T4), and 11.5 g (T5), using the Smartamine TM technology of Rhone Poulenc Animal nutrition. Maize silage was offered ad libitum, plus soyabean meal and a concentrate containing (%) : beet pulp 30, barley 20, formaldehyde treated soyabean meal 16, wheat bran 10, forage peas 10, beet molasses 8, tallow 4, and urea 0.17. In both trials the soyabean meal and the concentrate were fed according to predicted milk yield. On average the former accounted for 15 % of the total ration in both trials, the latter accounting for 15 % in trial 1 and 5 % in trial 2. The rations covered respectively 106 and 115 % of net energy and 122 and 125 % of PDI I

Influence of increasing doses of intestinal digestible methionine (MetDI) on the performance of dairy cows in mid and late lactation