Abstract
Abstract The objective of this study was to evaluate the effect of using increasing levels of cassava root meal in the diet of broilers, estimated by the performance and yield of carcasses, cuts, and viscera over, in the period 10 to 42 days of life. A completely randomized design was carried out, with four treatments and four repetitions. The experimental unit consisted of 16 male and female Cobb 500 chickens (a total of 256 birds) that were 10 to 42 days old. The treatments consisted of four diets with 0%, 7.5%, 15%, and 22.5% of cassava root meal (CRM) in three feeding programs. At 42 days old, four birds per unit were slaughtered and the carcass yield, main cuts, and edible viscera were evaluated. The inclusion of levels of 15% and 22.5% of CRM in the diet of broiler had a negative influence on weight gain, food consumption, and feed conversion in the initial period and in the overall growth of the birds. Carcass yield, cuts, and viscera were not influenced by the diet. Based on the results, it is recommended that a maximum of 7.5% of the cassava root bran may be used in the diet of broilers of the Cobb 500 strain, over 10 to 42 days, without compromising the zootechnical performance of the birds or the yield of edible carcasses, cuts, and viscera.
Highlights
The Brazilian poultry industry occupies a prominent position on the world stage, ranking third among the largest producers and first in exports[1]
The experimental design was completely randomized (DIC), with the birds distributed in four treatments and four replicates of 16 birds each, totaling 16 plots and 256 birds
The study was carried out in a high-temperature environment, with the birds subjected to heat stress according to the classification by the Cobb broiler manual[22]
Summary
The Brazilian poultry industry occupies a prominent position on the world stage, ranking third among the largest producers and first in exports[1]. The agricultural sector has been adopting strategies to make production more efficient and at a lower cost One of those strategies is the use of a variety of ingredients in poultry feed to improve animal performance and reduce costs[2]. Corn is the most widely used energy ingredient in the formulation of poultry feed, but it is expensive and competes with use in human food especially in regions with low availability[4]. This reality stimulates the need to search for new food alternatives to replace the traditional energy sources used in poultry-diet formulations
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