The choline content of feed ingredients and mixed feeds determined by an enzymatic assay

✍ Scribed by Menten, José Fernando M; Pesti, Gene M; Halley, John T

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 165 KB
• Volume: 78
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/(sici)1097-0010(199811)78:3<399::aid-jsfa132>3.0.co;2-q

✦ Synopsis

A recently developed procedure for the determination of choline in ingredients and feeds was utilised to establish the levels and the variability of choline in a series of ingredients and to compare the analysed and calculated choline values of mixed feeds. The concentrations of choline in samples of maize (7), canola meal (3), wheat middlings (1) and dehydrated bakery product (1) were, respectively, 1É55 ^0É18, 7É59 ^0É08, 2É35 and 2É39 g kg~1, all higher than ingredient composition table values. Choline contents lower than table values were found in samples of poultry by-products (7) and meat and bone meal (6) : 2É18 ^0É87 and 1É08 ^0É29 g kg~1, respectively. The average choline concentration found in samples of dehulled soybean meal (7) was 2É73 ^0É18 g kg~1, similar to table values. The choline in samples of poultry fat (2) averaged 0É48 ^0É02 g kg~1. SigniÐcant correlations between the concentrations of choline and of some components of the proximate analysis were found. The analysed choline concentrations in mixed feeds were only 1É4% lower than the calculated levels based on the ingredient analyses. The procedure was adequate for choline determination in ingredients or mixed feeds. The high variability in the choline content of some ingredients may require analysis for proper feed formulation.

1998 Society of Chemical Industry.