METABOLISM AND NUTRITION
Henry L. Classen (University of Saskatchewan)
- Digestibility Trial: To determine the apparent metabolizable energy (AME), and amino acid and fat digestibility of LinPRO when fed to broiler chickens.
- Broiler Trial: To study the use of graded levels of LinPRO on the performance of broiler chickens and to study the impact of diet on the fatty acid profile of broiler chicken carcasses.
- Extruded LinPRO at 30% of a basal diet was compared to an equal amount of flaxseed and peas that were ground in a hammer mill before use.
- Chicks were fed a commercial diet from 1 to 24 days of age and then transferred to a treatment diet containing 0 or 30% of the test meal.
- After 7 days, the contents of the proximal ileum, terminal ileum and feces were collected for analysis.
- Four dietary treatments were used (0, 5, 10 or 15% LinPRO), with each formulation containing equal protein and energy.
- Each treatment was replicated five times with 124 birds per replication.
- Birds were on trial from 0 to 39 days of age.
- Body weight, feed consumption, daily mortality and a subjective litter quality assessment were recorded throughout the trial.
- At 19 and 39 days of age, ileal contents and fatty acid profiles of carcasses were examined.
- Birds fed extruded LinPRO gained more weight and converted feed more efficiently than those that were fed the same ingredients in a non-extruded form.
- Diets including LinPRO had a lower AME, as well as reduced fat digestibility in comparison to the non-extruded form. However, all amino acids except methionine and serine were more digestible for LinPRO.
- LinPRO resulted in a linear decrease in growth rate for 0-19 days, but had no effect on gain from 19 to 39 days. The degree of this effect was relatively small.
- LinPRO did not affect the total fat content of the carcass; however, including LinPRO had a major effect on the fatty acid composition of the carcass fat. Most notably, omega-3 fatty acids increased while palmitic and oleic acid decreased.
- LinPRO caused a major increase in the omega-3 content of carcass fat with the largest portion of this increase coming from linolenic acid.
- Extrusion does improve nutrient utilization.