effects of concentrate source (cottonseed vs. barley)on milk performance and fatty acids profile of holstein-friesian dairy cows

milk performance (protein and fat content) and milk fatty acids (fa) profile of dairy cows under supplementation with two sources of concentrate, oilseeds (c, cottonseed) at two levels, low (5kg dm/cow/day) and high (7 kg dm/cow/day), and cereal grains (b, barley) at high rate (7 kg dm/cow/day), were studied in three herds (n=36) of spring calving holstein-friesian dairy cows (200 days in milk). animals were randomly assigned to one of three indoors (n=12) silage feeding regimes (c5, c7 and b7), using a tmr (total mixed ration) basal diet, containing 70-80% silage (grass: maize, 36: 64) and 30-20% concentrate. daily milk yield (my) was higher (p