Studies on degradation and outflow rate of protein supplements in the rumen of dry and lactating Chios ewes and Damascus goats

Abstract

Outflow rate of small particles from the rumen of dry and lactating Chios ewes and Damascus goats were measured in two separate trials using Cr-treated soya-bean meal (SBM). In another trial, the in situ degradation of fish meal (FM) and SBM in the rumen of Chios ewes and Damascus goats were measured. Outflow rate (per h) of small particles from the rumen of the two species was similar but higher outflow rates were observed in lactating than in dry animals (dry ewes 0·054, lactating ewes 0·086, dry goats 0·057, lactating goats 0·081). With the exception of dry-matter degradability of SBM at 6-h incubation periods there were no significant differences between ewes and goats in crude protein or dry-matter degradability of both supplements at all incubation intervals. Degradation measurements at various incubation periods and effective degradation values were different between supplements.

The effect of increasing the proportion of barley straw in pelleted concentrate diets given to lambs on rumen outflow rate and degradation of protein supplements

“…The low degradability of FM is in agreement with previous estimates (Ganev et al, 1979;Lindberg, 1981a;Miller 1982;0rskov et al, 1983;Madsen and Hvelplund, 1985;Hadjipanayiotou, Koumas, Georghiades and Hadjidemetriou, 1988). Although protein degradation of FM is highly dependent upon the source of fish meal and its processing (Mehrez et ah, 1980), the a, b and c constants found in this study are in the range of values reported by 0rskov et al (1981).…”

Fractional outflow of soyabean meal from the rumen of Chios lambs and Damascus kids

“…Fractional outflow of soyabean meal from the rumen was significantly (P < 005) greater in lambs (Table 1). This is in contrast with the data of Hadjipanayiotou et al (1988) where there were no differences in fractional outflow rate of Cr-treated soyabean meal from the rumen of mature Chios ewes and Damascus goats. Mean hourly fractional outflow rate of Cr-treated soyabean of lambs, however, was similar to that from lactating Chios ewes (Hadjipanayiotou et al 1988), Damascus goats (Hadjipanayiotou et al 1988) and cows (Hartnell & Satter 1979) for the same rate of intake.…”

“…In a series of experiments, the factors affecting the fractional rates of outflow of dietary protein supplements from the rumen of sheep and lactating dairy cows were investigated (Agricultural Research Council 1984). In addition, outflow rate of soyabean meal from the rumen of dry and lactating Chios sheep and Damascus goats offered high concentrate diets was determined in recent studies (Hadjipanayiotou et al 1988). Chromium-treated protein supplements were used to measure their outflow from the rumen using the marker concentration in faeces (0rskov 1982).…”

Rapeseed meal as a supplementary protein for dairy cows on grass silage-based diet, with the emphasis on the Nordic AAT-PBV feed protein evaluation system

“…, Colucci et al 1990). At maintenance level the outflow rate of particles has been measured as 3 to 4 per cent, rising to 6 to 9 per cent at higher feeding levels (Ganev et al 1979, Lindberg 1982, Elinam and ORSK.OV 1984 1982, Hadjipanayiotou et al 1988, Colucci et al 1990.…”