EFFECTS OF USING DIFFERENT LEVELS OF ENERGY AND NITROGEN ON SOME PHYSIOLOGICAL ASPECTS IN SHEEP

Abstract

This study was carried out on 2 Rahmani lamb rams of 3 months of age during the experimental period from June 1993 till December 1993. The aim was to study some physiological responses of feeding growing sheep on standard (62 %) or high ( 72%) of Total Digestible Nutrients ( TDN) level and standard ( 10 %) or high( 16 % ) of crude protein ( C P)

level according to (NRC , 1988 ) recommended levels . Besides , urea ' . was used to substitute about 20% of total crude protein nitrogen in order

to decrease cost of feeding . So , there were eight ( 8 ) combinations of ' experimental rations(treatments) as follow:-

( 1 ) - The 1st and 2nd . rations provided 10 % CP and 72 % TDN level , except that urea replaced ( 19.42 % of total CP nitrogen ) of 1st ration . ( 2 ) -The 3'ct and 4th rations provided 16 % CP and 72 % TDN level,

except that urea replaced (.19.49% of total CP nitrogen) of the 3rctration. ( 3 ) - The 5th and 6th rations provided 10 % CP and 62 % TDN level, except that urea replaced ( 19.51 % oftotal CP nitrogen) of the 51h ration. ( 4 ) - The ih and 8th rations provided 16 % CP and about 62 % TDN

level, except that urea replaced ( 19. 56% of total CP nitrogen)

ofthe 11 ration.