Chemical characteristics of poultry slaughterhouse byproducts

Abstract

In this study, nutritional components that are obtained during poultry slaughtering having significance with respect to processing into animal feeds were investigated. By-products obtained during poultry slaughtering are considered very valuable raw materials for production of highly valuable animal feeds and energetic feeds. Recognition of chemical and physical characteristics of the raw materials represents essential prerequisite for conduction of any technological process, for proper raw materials handling as well as for the equipment and machines design that are necessary for acceptance and processing of the inedible slaughterhouse by-products. Authors have found that the nitrogen complex of the examined raw materials contains predominantly proteins. Digestible nitrogen for all investigated raw materials equals approximately with total nitrogen content, indicating that all proteins from these raw materials are accessible for utilization in animal organism, with exception of feathers that need special technological processing. Basic chemical composition, nitrogen fractions and amino acid composition of the inedible by-products from poultry slaughterhouses indicate that the processing of these raw materials could be directed into production of swine and pet feeds production, as well in production of bio fuels and biogas. Blood and feathers anyhow represent significant protein source, and soft wastes, heads and legs, as well as the mixed raw material, besides as protein source, can be regarded as raw fat source. .U radu su ispitivane hranijive komponente animalnih sirovina koje se dobijaju pri klanju zivine znacajne za preradu u stocna hraniva. Sporedni proizvodi klanja zivine su vrlo vredne sirovine za proizvodnju visoko proteinskih i energetskih hraniva. Poznavanje hemijskih i fizickih karakteristika sirovina neophodan je preduslov za vodjenje tehnoloskog procesa, za pravilnu manipulaciju sa sirovinom kao i za projektovanje aparata i masina koje se koriste za prijem i preradu nejestivih sporednih proizvoda klanja. Autori su utvrdili da je azotni kompleks ispitivanih sirovina sastavljen pretezno od proteina. Svarljivi azot kod svih ispitivanih uzoraka priblizan je ukupnom azotu sto pokazuje da su svi proteini iz ovih sirovina pristupacni za iskoriscenje u organizmu zivotinja, osim kod perja, koje zahteva posebnu tehnolosku obradu. Osnovni sastav, azotne frakcije i aminokiselinski sastav nejestivih sporednih proizvoda iz zivinskih klanica pokazuje da se prerada ovih sirovina moze usmeriti u proizvodnju hraniva za ishranu svinja i kucnih ljubimaca, biogoriva i biogasa. Krv i perje svakako predstavljaju znacajan izvor proteina, a meki otpaci, glave i noge, kao i mesana sirovina, pored proteina, znacajan su izvor i sirove masti. .