A comparison of two excreta collection techniques ( TRAY vs PLASTIC BAG) for amino acids digestibility and metabolizable energy determinations of rapeseed meals in adult cockerels

• Main Author: Perpustakaan UGM, i-lib
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 1993
• Subjects: Jurnal i-lib UGM
• Online Access: https://repository.ugm.ac.id/20186/; http://i-lib.ugm.ac.id/jurnal/download.php?dataId=3032
• Institution: Universitas Gadjah Mada

Two techniques of excreta collection (tray and plastic hag) were compared to measure true digestibility of protein (TDP), amino acids (TDAA) and true metabolizable energy (TME) of rapeseed meals, obtained from whole seed (WRSM) and dehulled seed (DRSM). Thirty-six intact (Isa Brown) cockerels of 12 months old, were divided into two groups of 18 cockerels each. They were fasted for 24 hours and then force fed a moistened diet composed of 50% feed and 50% water. In the first group, trays were placed under cages for excreta collection, and in the second one, the plastic bags with harnesses, were attached to the birds immediately after force feeding. The two techniques of excreta collection (tray and plastic hag) had no significant effect on TDP, means of TDAA of 14 amino acids and TME of WRSM and of DRSM. However, true digestibility of cystine of WRSM and of DRSM was higher (P < .05) for plastic bag compared to the tray technique. True digestibility value of cystine of WRSM for tray and plastic bag techniques was 74.4 and 77.9%, respectively. Those of DRSM were 79.1 and 84.9%. These results may be explained by the fact that there was a contamination of excreta with scales and feathers in trays collection. Therefore, the plastic hag technique appears to be more suitable and precise for determining the true digestibility of amino acids in feedstuffs. (Key words: Excreta collection, Amino acids, Metabolizable energy, Digestibility, Rapeseed meals.)