'Royal College of Obstetricians & Gynaecologists (RCOG)'
Abstract
Not AvailableBACKGROUND: The present study evaluated the potential of increasing dietary levels of the most limiting amino acids such
as total sulfur amino acids (TSAA) with respect to mitigating the adverse effects of the inclusion of guar meal (GM) in the diet
of WL layers on egg production, feed efficiency and egg weight. In total, 4928 WL (Lohmann L) hens (32week of age) were
randomly allotted to eight treatments with sevenreplicates of 88 birds. Thedietary treatmentswere a set of four maize–soybean
meal based diets containing four graded concentrations of TSAA (5.85, 6.18, 6.51 and 6.84 g kg−1) and another set of four diets
containing 100 g kg−1 guarmeal (GM) with similar concentrations of TSAA.
RESULTS: The inclusion of 100 g kg−1 GM in the diet caused a 20%, 23%, 35.5% and 6.7% reduction in egg production, daily
egg mass, feed efficiency and egg weight, respectively, when the diet contained 5.85 g kg−1 TSAA. Increasing TSAA levels in
GM groups reduced the adverse effects on egg production and feed efficiency 50%, with no effect on egg weight. The TSAA
requirement of WL birds fed 10% GM was estimated as 6.28–7.39 g kg−1 diet at different ages.
CONCLUSION: Increasing dietary TSAA to 7.39, 6.28, 6.53 and 6.37 g kg−1 or dTSAA (digestible TSAA) to 6.53, 5.32, 5.80 and
5.63 g kg−1 during 33–36, 37–40, 41–44 and 45–48weeks of age, respectively, may be an effective and practical strategy for
reducing the adverse effects of inclusion of 100 g kg−1 GM in the diet of WL layers.Not Availabl
