International Journal of Agricultural Sciences

International Journal of Agricultural Sciences ISSN 2167-0447 Vol. 10 (8), pp. 001-007, August, 2020. © International Scholars Journals

Full Length Research Paper

Determination of protein quality and true metabolizable energy of high oil poultry by-product meal

Kalvandi Omid¹, Janmohammadi Hossein²* and Sadeghi Ghorbanali¹

¹Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Iran.

²Department of Animal Science, Faculty of Agriculture, University of Tabriz, Iran.

Accepted 22 October, 2019

Abstract

The three high oil poultry by-product meal (PBPM) samples were obtained from three poultry slaughter-houses in East Azerbaijan Province, Iran. For evaluating of protein quality, 126 male broiler chicks in a completely randomized design as factorial arrangement was used and fed experimental diets from 8 to 17 days of age. The experimental diets consisted of a nitrogen-free basal diet based on corn starch and glucose and six semipurified diets. Semipurified diets were obtained by replacing each of the three PBPM samples with portion of cornstarch and glucose in the nitrogen-free basal diet to provide 6 and 10% crude protein (CP). Sixteen cecectomized roosters (4 roosters per PBPM sample and 4 roosters for determining endogenous energy loss) were used for determination of true metabolizable energy (TME_n) content of PBPM samples. TME_n content of PBPM samples was different significantly (p<0.05) and was 3696 kcal/Kg as average. PER and NPR values varied from 1.29 to 1.727 and 2.463 to 3.001 and showed significant differences among PBPM samples (p<0.05). The results showed that with increasing CP level, protein efficiency ratio (PER) values was increased (p<0.05). Net protein ratio (NPR) value was not affected by CP level. As the assay length increased from 6 to 10 days, PER and NPR values decreased (p<0.05). Protein quality ranking, with PER, among three PBPM samples is the same in two period assays.

Key words: High oil poultry by-product meal, protein quality, metabolizable energy_, cecectomized rooster.