Resumen:
The generation of poultry slaughterhouse waste from poultry production is not only unavoidable but the
amount and kinds of waste can cause environmental problems. In the present study, the potential rumen
digestion of poultry slaughterhouse waste which consists of protein-rich organic residues was evaluated.
The chemical composition, amino acid profile and Cornell Net Carbohydrate and Protein System fractions
of these wastes was determined. Rumen digestion of poultry slaughterhouse waste was compared with
two common protein sources (fish meal and roasted soybean). Three poultry slaughterhouse waste
samples were collected from industrial poultry slaughter-houses and the in situ degradation was done
using rumen cannulated sheep. The protein (50e63%), ether extracts (18e27%) and ash (9e15.5%) contents
of different poultry slaughterhouse waste samples were different (P < 0.05). Methionine and lysine
contents were similar among different poultry slaughterhouse waste sources. Difference were observed
for cystine (1.2e1.7%), threonine (1.9e2.2%), arginine (3e3.5%), leucine (3.5e4.1%) and valine (2.8e3.3%)
(P < 0.05). Ruminal degradation rate for dry matter, organic matter and protein were different among
poultry slaughterhouse waste, fish meal and roasted soybean. The degradation parameter for protein
degradation was 76% for poultry slaughterhouse waste, 79% for fish meal and 98% for roasted soybean
(P < 0.05). Results revealed that there was great variation in chemical composition, protein fractioning,
and amino acid profiles of different poultry slaughterhouse waste sources. Poultry slaughterhouse waste
is slowly-degraded protein in the rumen and thus can be an economical and rich source of rumen undegradable
protein in ruminant nutrition. This implies that the use of poultry slaughterhouse waste in
ruminant nutrition has a huge potential as a cleaner product of animal feeding and prevention environmental
pollution. However, further studies are warranted to evaluate the digestibility of poultry
slaughterhouse waste amino acids escaping the rumen into the intestine in ruminants and to compare
the biological values for the amino acids in these waste material with common ruminant feedstuffs.
Descripción:
The nine samples from each slaughterhouse were pooled and
sub-sampled to make three samples per slaughterhouse. Dried
PSW samples were ground through a 1 mm screen (Wiley mill,
Arthur H. Thomas, Philadelphia, PA), and samples analyzed for
amino acids, total nitrogen, fat, ash and organic matter (AOAC,
1990). The CNCPS protein fractions of the PSW was determined
according to standardized procedure of Licitra et al. (1996) at the
University of Bahonar, Kerman. The B2 fraction was calculated by
difference and results are reported as CP percentage. Phosphate
buffer soluble nitrogen (PBSN) was determined using the phosphate
buffer. Neutral detergent insoluble nitrogen (NDIN) and acid
detergent insoluble nitrogen (ADIN) were determined as the nitrogen
content of the residual after neutral and acid detergent
procedures. The analysis of 11 amino acids i.e. arginine, cysteine,
histidine, isoleucine, leucine, lysine, methionine, phenylalanine,
threonine, tryptophan and valine in three different PSW samples
was performed using NIRS, FOSS 5000 Denmark at the Paya Amin
Mehr Company (Tehran, Iran).