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Thirty two 3 months old Polish Lowland wethers of about 20 kg initial body weight were divided into four equal groups. Wethers in each group were fed individually for 78 days with diets consisting of dried sugar beet pulp and meadow hay supplemented with untreated or formaldehyde-treated casein and untreated or formaldehyde-treated rapaseed oil meal. Al l diets contained about 20% crude fibre and 17% crude protein (DM basis), about 50% of that protein was derived from casein or rapeseed oil meal. Dry mater and protein digestibility of diets containing formaldehyde treated feeds was less (P < 0.05) and animal body weight gains were lower (P < 0.01) than those with untreated feeds. Body gains were 20% higher in groups fed rapeseed oil meal comparing to those fed diets with casein (P < 0.01). Differences in length, weight and thickness of wool were not significant (P > 0.05) between animals receiving untreated or formaldehyde-treated protein. K E Y W O R D S : sheep, formaldehyde, protein, degradability, wool , performance I N T R O D U C T I O N Dietary protein that is protected from rumen degradation but is digestible in the small intestine of ruminant should be utilized more efficiently than unprotected protein. Ferguson et al. (1967) reported significant increases in performance and wool growth when sheep were fed formalaldehyde treated casein rations compared with untreated diets. The use of such treated protein is recommended to improve ruminant performance (Barry, 1972; Hemsley et al., 1973; Soroczyriska et al., 1986; Ceresnakova and Sommer, 1988). In our earlier study (Kowalczyk et al., 1975) formaldehyde treatment of rapeseed oil meal protein did not improve the performance of young bulls. Langlands (1971) did 36 J. KOWALCZYK ET AL. not obtain an improvement in wool growth rate of sheep fed formaldehyde-treated cottonseed meal. The aim of the present work was to compare the performance and wool growth in sheep fed diets containing formaldehyde-treated and untreated casein or rapeseed oil meal. M A T E R I A L A N D M E T H O D S The experiment was carried out with four groups of eight 3-months old Polish Lowland wethers of about 20 kg initial body weight. Wethers were kept in individual pens with free access to water and were fed twice daily on a diet consisting of dried sugar beet pulp, medow hay and a vitamin-mineral mixture supplemented with untreated (U) or formaldehyde-treated (F) casein (C) or double improved rapeseed (R) oil meal (groups CU, CF, RU and RF, respectively; Table 1). The diets were formulated according to Polish standards

Performance and wool growth in lambs fed rations containing formaldehyde treated protein