Introduction and Objectives
Betaine (BET) acts as a methyl donor to convert homocysteine into methionine (MET), sparing both choline (CHOL) and MET. In the last years, synthetic MET and CHOL became a key concern in feed formulation as their prices have increased and hence BET can be an economic alternative. Objective: to test the bio-equivalency of 4 commercial BET products (3 anhydrous and one hydrochloride) in broiler grower diets low in MET and CHOL.
Materials and Methods
- 840 day old males and females Ross 308 broilers were housed separately in 42 pens (2.2 m2 ).
- Experimental diets were fed to broilers from 10–28 days of age.
- 7 dietary treatments with 6 replicates (20 birds / pen) as follows:
T1) Low CHOL, no added MET and a ratio d.M+C/d.Lys of -10% of standard (0.63). d. Lys = 10.5 g/kg feed.
T2) T1 + 0.7 g/kg MET from DL-MET with d.M+C/d.Lys ratio at standard (0.70),
T3) T1 + 0.7 g/kg CHOL from choline chloride,
T4) T1 + 0.7 g/kg BET as ActiBeet® VC,
T5) T1 + 0.7 g/kg BET as ActiBeet® L,
T6) T1 + 0.7 g/kg BET as Product C,
T7) T1 + 0.7 g/kg BET as Product D.
Body weight gain,
Feed conversion ratio.
- Data analysed with ANOVA (Genstat).
No interaction “Treatment x Sex” was observed in any trait (P > 0.10).
Addition of 0.7 g/kg BET (on equimolar basis) from ActiBeet® VC, ActiBeet® L and Product C were able to fully replace the equal amount of added MET and CHOL in broiler grower diets when d. M+C/d.Lys ratio decreased from 70 to 63%.