Abstract
A study was conducted to compare live performance and digestive metabolism of broiler chickens fed all-vegetable diets (All-Veg) compared to a regular diet including animal by-products. Three feeds were formulated and provided to broilers according to the feeding program: pre-starter from 1 to 10 days, starter from 11 to 21 days, and grower from 21 to 35 days. All feeds had corn and soybean meal as major ingredients; however, two of them were all-vegetable diets having either Degummed Soybean Oil (DSO) or Acidulated Soybean Soapstock (ASS) as fat sources. The third diet included poultry by-product and poultry fat. A total number of 360 day-old broiler chicks were allocated to 1m2 battery cages, 10 chicks in each, and 12 replicates per treatment. Live performance was similar between groups of birds receiving the different diets with the exception of weight gain, which was increased for birds fed the All-Veg diet with ASS. Birds fed All-Veg diets had increased water intake and produced more excreta with a concurrent reduced feed metabolizability at both ages, regardless of fat source. Metabolizable Energy was not different for the three diets.
Highlights
The European Community banned the inclusion of animal by-products in feeds for animals raised for human consumption, including poultry, as part of the strategy to control the spread the “Mad Cow Disease” (Bovine Spongiform Encephalopathy-BSE) (CEC, 2000)
High excreta viscosity and an increased number of anaerobes were found in broilers fed diets with 4.5% of pectin (Wagner & Thomas, 1978), which was related to nutrient utilization and acceleration of feed passage
Body weight gain throughout the experiment showed an improvement for broilers fed the all vegetable diet supplemented with Acidulated Soybean Soapstock (ASS) as compared to the diet supplemented with Degummed Soybean Oil (DSO) (Table 4)
Summary
The European Community banned the inclusion of animal by-products in feeds for animals raised for human consumption, including poultry, as part of the strategy to control the spread the “Mad Cow Disease” (Bovine Spongiform Encephalopathy-BSE) (CEC, 2000). This decision was later adopted by other countries, such as Saudi Arabia. The formulation of broiler feeds exclusively with vegetal ingredients requires a greater inclusion of soybean meal. High excreta viscosity and an increased number of anaerobes were found in broilers fed diets with 4.5% of pectin (Wagner & Thomas, 1978), which was related to nutrient utilization and acceleration of feed passage
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