In situ evaluation of hen mortality meal as a protein supplement for dairy cows.
A study was conducted to evaluate the nutritional composition and in situ degradation of hen mortality meals. There were four treatments: control autoclaved hen meal (C-HM), enzyme-treated, fermented, autoclaved hen meal (E-HM), NaOH-treated, fermented, autoclaved hen meal (NaOH-HM), and soybean meal (SBM). For the E-HM or NaOH-HM, hen mortality was treated with a feather digesting enzyme or NaOH to improve digestibility of feathers on the carcass. After the enzyme or NaOH treatment, treated hen mortality was preserved by a fermentation procedure. The crude protein levels of the C-HM and SBM were higher than the E-HM and NaOH-HM, and the concentration of fat in the C-HM was higher than the other treatments. Levels of Lys, Thr, Arg, Ile, Leu, Val, and Phe for the C-HM and SBM were higher than in the E-HM and NaOH-HM. The Met, Cys, and Gly levels in the C-HM were higher than the soybean meal. In situ ruminal degradation data showed that the C-HM had lower dry matter and crude protein degradation than the other treatments, whereas the E-HM or NaOH-HM was more susceptible to ruminal degradation. These results indicate that the C-HM has higher levels of crude protein, amino acids, and resistance to ruminal degradation, whereas the E-HM or NaOH-HM was more digestible to ruminal microorganisms.
Department of Poultry Science, The Pennsylvania State University, University Park 16802-3501, USA.
W K
WK
Kim
P H
PH
Patterson
D000596:Amino Acids / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001419:Bacteria / Q000378:metabolism; D002417:Cattle / Q000502:physiology*; D002645:Chickens; D004032:Diet; D004041:Dietary Fats / Q000032:analysis; D004044:Dietary Proteins / Q000008:administration & dosage* / Q000032:analysis; D004063:Digestion; D004798:Enzymes; D005241:Feathers; D005260:Female; D005285:Fermentation; D005511:Food Handling; D006358:Hot Temperature; D011202:Poultry Products; D011312:Pressure; D012417:Rumen / Q000378:metabolism / Q000382:microbiology; D012972:Sodium Hydroxide; D013025:Glycine max
D000596:Amino Acids; D004041:Dietary Fats; D004044:Dietary Proteins; D004798:Enzymes; D012972:Sodium Hydroxide