In a typical broiler diet, oils and fats provide the highest energy level but also cost the most on a per kg basis. To improve fat digestion and absorption, and hence energy utilization from the diet, the diet can be supplemented with an exogenous source of biological emulsifier called LYSOFORTE™ Dry.
LYSOFORTE™ is a bio-emulsifier, effective in improving the absorption of oils and fats from the feed by the birds.
The following properties of LYSOFORTE™ Dry are responsible for the observed efficiency in increasing the rate and efficiency of fat digestion and absorption:
LYSOFORTE™ Dry are widely used in animal diets to increase the digestion and absorption of oils and fats and to improve animal performance and feed efficiency. A sequence of structured research studies on LYSOFORTE™ Dry demonstrated its positive effect on enhanced fat digestibility.
Live baby hamster kidney cells (BHK 21, clone 13) were cultured under standard laboratory conditions at 37°C and 5% CO2. Live cells were treated with radioactive (C-14) stearic and palmitic acids prepared in Hanks' balanced salt solution. At the same time, the cells were treated either with LYSOFORTE™ Dry or standard soy lecithin.
Results show that there was a more significant uptake of stearic acid and palmitic acid by the cell cultures in the presence of LYSOFORTE™ Dry than in the presence of soy lecithin. This indicates the ability of LYSOFORTE™ Dry to promote absorption of fatty acids.
Figure 1. Influence of LYSOFORTE™ Dry on the absorption of stearic acid by living cells
Figure 2. Influence of LYSOFORTE™ Dry on the absorption of palmitic acid by living cells
The AME assay was conducted to quantify the positive energy sparing effect of LYSOFORTE™ Dry, at Massey University, New Zealand using diets containing 3 different fat sources. LYSOFORTE™ Dry increased (P<0.05) AME in all treatments, resulting in substantial recovery of metabolizable energy of the reduced ME diet containing different fat sources. LYSOFORTE™ Dry supplementation produced the greatest effect on metabolizable energy recovery when applied to the diets with palm oil, causing an AME increase of 98kcal/kg in the reduced ME diet. For diets containing tallow and rice bran oil as the fat source, LYSOFORTE™ Dry supplementation resulted in an AME increase of 87kcal/kg and 81kcal/kg respectively.
A completely randomized design study with a 3 × 2 factorial arrangement was conducted to evaluate the effects of three different fat sources (soybean oil, tallow, and poultry fat) with or without LYSOFORTE™ Dry supplementation on the coefficient of total tract apparent digestibility (CTTAD) of fatty acids in broiler chickens. The CTTAD of C16:0, C18:2, and C18:3n3 was greater (P<0.05) for broilers fed diets containing soybean oil than for those fed diets containing tallow or poultry fat in the starter period.
Table 3: Effect of fat sources and LYSOFORTE™ Dry on the CTTAD of fatty acids in broiler chickens
a Each value represents the mean values of 7 pens of 6 animals each (n=7)
b Represents without LYSOFORTE™ Dry supplementation; + represents with LYSOFORTE™ Dry supplementation
The experiment was conducted as a 2 x 2 factorial arrangement of treatments. Two basal diets were formulated with two fat sources, namely soy oil and tallow, at an inclusion level of 40g/kg in starter diets and 60g/kg in finisher diets, with and without LYSOFORTE™ Dry. The diets were formulated to meet commercial specifications, and AME was maintained at 12.2 MJ/kg in basal diets. The growth performances of broilers during the starter and overall experimental period are presented in table 4. Weight gain was greater (P<0.001) for birds fed soy oil diet compared with those fed tallow diet during the starter period (d 1-21) as well the whole period (d 1-35).
Results demonstrated the addition of LYSOFORTE™ Dry improved the feed conversion efficiency of broilers for all fat type.
Table 4: Effect of LYSOFORTE™ Dry on broiler performance from soy oil and tallow diets
Use of supplemental fats and oils in broiler chicken diets as dietary energy-yielding ingredients is a widespread practice in the feed industry. Dietary fats vary in composition and their contribution to energy. Digestibility is the primary factor that affects the metabolizable energy value of oils and fats. The age of birds is another crucial factor affecting the ability to digest fats.
Therefore, supplementation of exogenous Bio-emulsifiers would be beneficial to enhance fat digestibility. Results from many research and commercial studies indicate that LYSOFORTE™ Dry supplementation can be used as a feeding strategy in poultry diets to improve fat digestibility and growth performance. LYSOFORTE™ Dry also provides an opportunity to manage feed cost, as expensive fat can be partially substituted in poultry diets.