Additives are added to compound feed in order to develop a certain effect. The diversity of effects of these substances is vast. They include satisfying nutrient demand, hygienising, functional support for digestion, toxin binding and de-toxication, taste improvement, technical/physical assistance in transporting, processing and storing feedstuffs, and much more besides. This diversity cannot be reproduced in just one issue of this magazine. That is why this time we are only looking at yeasts for supporting the health and performance of high-yielding cows, amino acids for exact covering of needs, and toxin binders to avoid harm caused by mycotoxins. Just how broad the field of “active ingredients” really is can be seen from the report on a feed material to which a pre-biotic effect can certainly be attributed. Finally, our three-part series on quantitative determination of soy in feed is finalised in this issue.

» Live yeasts in high-yielding cows
Diverse effects on health and performance

Can live yeast reduce stress due to incorrect or unbalanced feeding and thus improve the health status of high-yielding cows? Alongside the milk yield, the health status of the cows is a key economic factor in milk production. Studies on the use of live yeast conducted at the Schothorst Research Center (Lelystad, Netherlands) show the positive influence of live yeast (Vistacell) on the health and performance of heifers and already very high-yielding, adult cows.

» Interaction between branched chain amino acids
A problem in piglet feed?

In the course of evolution, higher life forms have lost the ability to synthesise certain amino acids, as these were evidently dispensable for a while for normal metabolism and/or because sufficient nutrients were available. With breeding progress, an insufficiency of some of these now essential amino acids leads to marked performance losses if the deficits are not made up by supplementing via the feed. Nevertheless, in practice there is still a surplus of some essential amino acids in feed rations. Consequently interactions with other amino acids can occur, which in a worst-case scenario can exacerbate the insufficiency of the already limiting amino acids.

» Deoxynivalenol in the gut
What exactly happens here?

More than 3,000 of the 12,947 academic publications on mycotoxins are about deoxynivalenol (DON). It is only in the last decade that scientists have begun to look more deeply into the effects of deoxynivalenol on the intestines of farm animals.

» Animals feel comfortable with a regulated gut
A raw material with prebiotic effect

It is above all the tannins contained in Caromic – a feed made of roasted, ground carob pods marketed by Euroduna from Barmstedt, Germany – which are responsible for its gut regulating effect. The product can be used for all kinds of farm animals as well as in pet food, improving feed tastiness through its high content of sugars. A trip to Spain provides insight into the origins and processing of the carob pod.

» ELISA for quantitative determination of the soy mass in feed mixtures
Alternatives to the official microskopy estimation method – Section 3

Published so far:
Section 1 of the long-term study (issue 11-12/ 2013)
In Section 1 the selection from suitable test systems was made on the basis of preliminary tests, the protein contents of various soy components were determined and the method as such was defined.
Section 2 of the long-term study (issue 1-2/ 2014).
Section 2 of this long-term study addressed Part 1 of the main examination. Within the context of this first part it was possible to make statements on the correlation between the PCR and ELISA methods. However, the need to improve this combined PCR-STI-ELISA method became evident, as dealt with in Part 2 of the main examination.