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Six dry Chios ewes and 6 dry Damascus goats an average weight of 58.1 and 60.0 kg, respectively were used in experiment 1. Animals were fed 42.8 g feed DM/kg 075 composed (kg/ kg) of 0.46 kg concentrate and 0.54 kg barley straw. In another experiment, 6 lactating Chios ewes and 6 lactating Damascus goats with an average live weight of 64 and 60 kg, respectively were used. They were given 129.2 and 125.6 g feed DM/kg 075,respectively. The feed composed (kg/kg) of 0.71 concentrate, 0.17 barley hay and 0.12 lucerne hay. At the end of a 14 day adaptation period, each animal was dosed with 40 (expt. 1) or 50 g (expt. 2) of Cr-treated soybean meal. Rectal grab samples were then taken over a 90 h period at 6 h intervals starting 12 h after labelling. Soybean meal was treated with sodium dichromate as outlined by Elimam and 0rskov (1984, Anim. Prod., vol. 38, p. 45). Mean fractional outflow rate (% per h) of Cr-treated soybean meal from the rumen was taken as the slope of the regression line calculated from the regression equation of natural log faecal Cr concentration and time. It was suggested that Cr-treated particles behaved in a similar way to original ones. Treatment of soybean with Cr resulted in a decrease of DM losses from dacron bags incubated in the rumen of sheep and goats for 40 h (untreated 0.610 v treated 0.089). Outflow rate of small particles (% per h) from the rumen of the two species was similar (dry ewes 5.4, dry goats 5.7 ; lactating ewes 8.6, lactating goats 8.1). Higher outflow rates from the rumen of animals offered high rather than low roughage diets has been reported by some authors. Thus, the higher values obtained in lactating compared to dry animals should be associated with the level of intake.

Degradation and outflow rate of protein supplements in the rumen of dry and lactating ewes and goats