Nutritive value of feather keratin meals for ruminants

摘要

Feather keratin meal (FM) or feather keratin meal with 10% blood (FBM) were produced by hydrolysis of hen feathers for 30-40 min at 143 deg C under 3 atm. of steam pressure. The obtained product was dried initially at 110 then at 90 deg C for 5 h for FM and 7 h for FBM. FM and FBM contained 92.3 and 90.3% dry matter, and, respectively: 9.5 and 7.7% of ether extract, 3.2 and 3.9 ash and similar amounts of crude protein in both meals, 86.8%, on a dry matter basis. Rumen protein degradability coefficients determined in situ were 0.30 and 0.32 and after in vitro digestion with pepsin intestinal digestibility of rumen undegradable protein determined by the mobile bag technique were 0.74 and 0.71 for FM and FBM, respectively. Digestibility of dry matter, crude protein and fat determined on young bulls by the difference method were 80.5, 81.2 and 60.6 for FM , and 80.0, 83.9 and 64.0 for FBM, respectively. FBM contained less leucine, isoleucine and arginine, but more histidine, methionine, phenylalanine, tyrosine and lysine compared to these amino acid contents in FM. The nutritive value of 1 kg FM and FBM expressed in INRA system units was: 1.16 and 1.11 UFL;1.10 and 1.05 UFV; 563 and 551 g PDIN; 472 and 463 g PDIE; 425 and 407g PDIA, respectively.