Various sources of methionine in broiler chicken rations

Abstract

Fodder methionine is one of the most important amino acids in animal nutrition, and its deficiency in the ration negatively affects productivity. Currently, the following sources of methionine are represented on the Russian market of feed additives: DL-Methionine and Methionine Hydroxy. Liquid form — Methionine Hydroxy Analog Free Acid (MHA-FA) and dry (for example, МНA) — calcium salt (MHA-Ca2+). The most popular sources of dry methionine are DL-Methionine and hydroxy analog as calcium salt. Many sources state that the bioavailability of the hydroxy analog varies from 65 to 72% (one of the manufacturers of the commercial hydroxy analog claims that the availability of methionine is 84%). The experiment was carried out on broiler chickens. As a result of the studies carried out, it can be argued that the content of DL-methionine in the ration (in the amount of 65% of the hydroxyanalogue) in comparison with MHA-Ca increases the productivity of broilers: preservation – by 4%; live weight by 4.3%; average daily gains by 4.6%; feed conversion decreased by 7.1%; has a positive effect on meat productivity. Based on the data obtained during the experiment, it follows that the efficiency of MHA-Ca does not exceed 65%, compared to DL-Methionine.

Probiotic drug based on Kluyveromyces marxianus for poultry

“…Several yeasts, which are eukaryotic microorganisms, have long been used in various industries because of their potential applications, both for fermentation and for the production of specific metabolites [14][15][16][17][18][19][20][21][22][23]. Kluyveromyces marxianus is one of the most favorable non-traditional yeasts, usually isolated from a wide range of natural habitats, such as fermented traditional dairy products, kefir grains, sugar industry wastewater, sisal leaves and plants.…”