ARTICLE 56 FEED & ADDITIVE MAGAZINE December 2022 TRIAL RESULTS Increasing SBO level without adding FRA® LeciMax Dry improved growth performance slightly from T1 to T3 while there was no further improvement from T3 to T5. This indicated a maximum capacity of broilers to utilize the feed despite high nutrient availability and is in line with the law of diminishing returns (Table 2). In contrast, FCR was significantly reduced with T5 compared to T1 and T3, this was due to a significantly lower feed intake. When FRA® LeciMax Dry was added on top significant improvements in final body weight and body weight gain were observed between T1 and T2, and between T5 and T6. Both parameters were numerically improved with T3 and T4. These results indicate a better utilization of the higher availability of both energy and amino acids, the latter being often a limiting factor for growth in high fat diets as high fat levels compromise protein digestion. While the FCR did numerically and significantly decrease from T1 to T2 and from T3 to T4, respectively, adding FRA® LeciMax Dry to T5 did not further improve FCR in T6. This can again be explained by the law of diminishing returns. Moreover, the addition of FRA® LeciMax Dry on the lower nutrient dense diet (T2) yielded a similar growth performance as T3, T4 and T5. This means that a lower nutrient dense diet supplemented with lysolecithins can be used to prevent the high feed costs of a high-dense diet while maintaining growth performance. Table 2. The effect FRA® LeciMax Dry of on broiler performance and nutrient density (day 0-42) Treatment T1 T2 T3 T4 T5 T6 FRA® LeciMax Dry - + - + - + Final BW (g) 3463.9c 3525.8ab 3488.2bc 3509.7bc 3485.3bc 3572.8a BWG (g) 3420.2c 3482.1ab 3444.5bc 3466.0bc 3441.6bc 3529.1a FI (g) 5383.5a 5455.3a 5428.6a 5400.0a 5284.6b 5435.1a FCR 1.574ab 1.567ab 1.576a 1.558b 1.536c 1.540c Livability (%) 95.8 97.2 95.8 95.1 96.5 95.8 ND 139.8 143.9 140.9 145.1 144.4 148.6 BW: body weight; BWG: body weight gain; FI: feed intake; FCR: feed conversion ratio; ND: nutrient density. a,b,c Means within a column with no common superscript differ significantly (P<0.05).
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