Abstract
Four trials, two with lactating Chios ewes and two with Damascus goats, were conducted to study the effect of feeding concentrate mixture with untreated soybean meal (SB), formaldehyde-treated soybean meal (FSB) (31 of 40% formaldehyde diluted in 77 1 water/t soybean meal), or fish meal (FM) on yield and composition of milk, rumen characteristics and degradability of the concentrate mixtures. Effective CP degradability of FSB (49%) mixture was lower than the other two (SB 54.4; FM 58.2%). Yield of milk, fat, protein, ash and total solids was not affected by protein source, although in trials 1 and 3 there was a trend towards higher 6% fat-corrected milk yield with FSB (2.33 kg/day) than with SB (2.16 kg/day) and FM (2.17 kg/day) diets. Molar percentages and concentration of volatile fatty acids (VFA) and NH 3-N in ruminal fluid of animals were not affected by dietary treatment. Ewes produced milk of higher fat, protein and total solids content than goats; similarly, rumen fluid had higher pH and total VFA concentration in ewes than goats.
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