Determining the mean concentration of tracer in a batch of heterogeneous animal feed
During tests to assess the amount of carry-over in delivery trucks, it became apparent that the best approach would be to take a 200-kg sample with a heterogeneous distribution of tracer (Technical Datasheet No.49). One would expect that this heterogeneous sample would have to be homogenised with a mixer before testing it in order to […]
Laboratory methods for assessing the segregation of additives tested by Tecaliman
A methodology for assessing segregation may consist of a straightforward comparison of coefficients of variation before and after mechanical or pneumatic transfers (Friedrich and Jansen, 1974 – Tecaliman, 1996a – Wild, 1999). However, this must involve CVhomogeneity values as residual variations can, as usual, hide the actual effects of stimulated factors, and in this case, […]
Homogeneity of mixes – Summary of experimental dat obtained by Tecaliman
In addition to the data published in Special Report no. 41, the base data compiled by Tecaliman between 1993 and 2001 may form the basis for comparing future results. Over the course of the period up to 2001, Tecaliman conducted 364 assessments of tracer dispersion, under all conditions. These assessments were carried out as pilot […]
Database on homogenisation performance and carry-over test in French feed factories Analysis of 2000-2018 results
In 2019, like every three years or so, Tecaliman carried out a survey following previous surveys.
Effect of homogeneity on livestock performance – Bibliographic references
Based on the definition of heterogeneity (i’Tec_H9), it is easy to claim that a product’s heterogeneity derives from the presence of non-identical samples. If the samples corresponded to the target animals’ daily ration, this would mean that, over the course of a given day, none of the animals would receive an identical ration.
Effect of premixer or premix usage on feedstuff homogeneity
The animal feed industry makes widespread use of micro-ingredient premixers and premixes. Several authors have described the advantages of these techniques. Coelho (1994) considers that the main reason for using premixes is to optimise the dispersion of ingredients. Raghavan (1997) also considers that this rationale is one of the 4 main advantages of using premixes: […]
Method for measuring bulk density, tap density and the Hausner ratio for additives and feedstuffs
Following the purchase of a new powder compac-tion apparatus, Tecaliman decided to modify its measurement procedure for bulk and tap densi-ties, and the resulting Hausner ratio. The objective was to arrive at a procedure similar to the measu-ring technique used by Carr (1965), as applied to the Hosokawa apparatus. Abdullah and Geldart (1999) demonstrated that […]
Checking temperature probes
Control of a heat treatment process involves having to control the main parameters that guarantee treatment efficacy, i.e. temperature. Generally speaking, this means making sure that the temperatures recorded during a batch treatment are conform with the initial set temperature and, therefore, that the temperature measurement chain is providing reliable data. Use of this method […]
Measuring the angle of repose (flow) found in animal feed additives
Tecaliman carried out the first angle of repose measurement tests based on a technique described in standard NF T 73-008 (1978) that we refer to as the angle of repose (distribution). The results obtained using this method initially designed for powder and pellet surface agents demonstrated that the method was not suitable for use with […]
Physical properties of the additives used in animal feed: Operation of a database
Since 1992, TECALIMAN has been characterising animal feed additives and running tests on their technological behaviour. One of the outcomes of these two activities has been the establishment of a general database on these products. A “representative” dataset was selected from this database and used to conduct a wider study on the physical and behavioural […]