The effect of full substitution of supplemental methionine with betaine in broiler nutrition on production and slaughter results

The use of betaine can influence the resistance, production performance and quality of broiler carcass, and potentially it can reduce the need for choline and methionine in food due to the mutual correlation of these three substances in the organism. Objective of the paper was to investigate the effect of full substitution of added DL-methionine with betaine in diets for broilers on production and slaughter parameters in conditions of optimal amount of choline in the feed. Study was carried out on 1725 one day old broiler chickens of Cobb 500 hybrid divided into 3 groups: Control group (C) fed complete forage mixtures with usual addition of DL methionine and two trial groups where methionine was substituted by 1g (B1group), and by 2g of betaine per kilogram of mixture (B2 group). Research results indicate that the full substitution of supplemented methionine with betaine in feed can have positive and negative impact in broiler fattening. Negative effects on final body mass, gain and feed conversion were determined in broilers fed mixtures where 1g of synthetic methionine was replaced with 1g of betaine preparation, and at the same time positive influence on mortality was observed, especially in broilers fed diets containing 2g of betaine. Production index showed no significant differences between trial groups, as well as studied broiler carcass quality parameters.

Upotreba betaina može imati uticaja na otpornost, proizvodne performanse i kvalitet trupa brojlera, a potencijalno može smanjiti i potrebu za holinom i metioninom u hrani usled međusobne povezanosti ove tri supstance u organizmu. Cilj rada je da se ispita uticaj kompletne zamene dodatog DL-metionina betainom u obrocima brojlera na proizvodne i klanične parametre u uslovima optimalne količine holina u hrani. Istraživanje je izvedeno na 1725 jednodnevnih brojlerskih pilića hibrida Cobb 500 podeljenih u 3 grupe: kontrolnu grupu (C) hranjenu potpunim krmnim smešama sa uobičajnim dodatkom DL metiona i dve ogledne grupe kojima je umesto metionina dodavan 1gram (B1grupa), odnosno 2g betaina po kilogramu smeše (B2 grupa). Rezultati istraživanja ukazuju da potpuna zamena dodatnog metionina betainom može imati i pozitivne i negativne efekte u tovu brojlera. Utvrđen je negativan uticaj na završnu telesnu masu, prirast i konverziju hrane kod brojlera kojima je u smešama 1g sintetičkog metionina zamenjen sa 1g betainskog preparata, ali i pozitivan uticaj na smanjenje mortaliteta, posebno kod brojlera sa 2g betaina u hrani. Proizvodni indeks se nije značajnije razlikovao između oglednih grupa, a takođe i ispitivani parametri kvaliteta trupa brojlera.