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An experiment was carried out in the College of Veterinary Medicine; University of Baghdad to investigate the effect of feeding formaldehyde treated meal on body weight gain, rumen fermentation, and some blood traits in local lambs. Twenty four lambs with body weight ranged from 20 to 23 kg and aged about 3 to 4 months were selected and divided randomly into two groups of twelve each (body weight was considered). These animals fed daily concentrate diet (3% of their body weight) and 0.5 kg of alfalfa hay, in addition to freely graze for 2-3 hours/ day. Results showed highly (p ≤ 0.05) a significant difference in the body weight gain (24.12 ± 1.01 kg) and weight of wool fleece, testis (298.00± 23.09 g) and kidneys (195.00± 8.66 g) between groups of lambs fed bypass protein compared with control group. Also, animals fed treated meal had higher (p ≤ 0.05) significantly in meat content of crude protein (17.42 ±0.31), digestibility(57.19 ± 2.58 ) and alkaline phosphatase enzyme(ALP) compared with control group, while there are no differences in amino acids in meat between groups of lambs. The results showed significant differences appeared in serum total protein and blood urea. In addition, no significant differences appeared in rumen fermentation parameters except rumen Ammonia-N. In conclusions: the bypass proteins technology may improve the production performance in local lambs. Therefor the bypass meal can be added to the diet of lambs for fattening. It had a positive effect on growth and fat composition of meat.

Effects of bypass proteins on growth performance, kidneys and liver functions, rumen fermentation and meat amino acid analysis in male lambs