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Effect of supplementation with urea natural proteins or protected proteins of plant or animal origin on the utilization of poor quality roughages 1. nutrients digestibility and nitrogen utilization



Effect of supplementation with urea natural proteins or protected proteins of plant or animal origin on the utilization of poor quality roughages 1. nutrients digestibility and nitrogen utilization



Egyptian Journal of Animal Production 25(1): 137-150



Twenty-four growing Rahmany male lambs of 6 month-old were alloted into 8 equal groups. The animals received wheat straw rations without nitrogen (N.) supplementation or with N. supplements of urea, untreated casein (UCAS), formaldehyde treated casein (FCAS), urea+FCAS, untreated decortecated cottonseed meal (UCSM), formaldehyde treated decortecated cottonseed meal (FCSM), or urea+FCSM. The experimental period lasted for 12 weeks. The digestibility and N-balance trials were carried out at the end of the 1st, 5th and 9th weeks of the experimental period. The results showed that supplementation by urea, UCAS or UCSM increased nutrient digestibility compared with the results recorded for the control group. Animals given the FCAS or FCSM supplements showed higher values for nutrients digestibility compared with those given urea, UCAS or UCSM supplements. Supplementation by both urea and FCAS or FCSM increased greatly nutrients digestibility compared with the values obtained for all other diets. Digestibility values recorded for FCAS diets were somewhat higher for nutrients digestibility than those recorded for FCSM diet. Animals given no N. supplementation were in negative N-balance, while the other groups were in positive N-balance supplementation by FACS or FCSM slightly improved N-balance compared with the groups given urea, UCAS or UCSM. Lambs given the FCAS are FCSM in combination with urea showed the highest values for N-balance compared with the other groups.

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Accession: 005273962

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