Metabolizable energy levels in diets with a fixed nutrient: calorie ratio for free-range broilers / Níveis de energia metabolizável com manutenção da relação nutriente: caloria em dietas para frangos de corte tipo caipira
Silva, Thiago Rodrigues da; Nascimento, Karina Márcia Ribeiro de Souza; Kiefer, Charles; Copat, Luanna Lopes Paiva; Freitas, Henrique Barbosa de; Chaves, Natália Ramos Batista; Silva, Larissa Albuquerque Rosa; Leite, Jeovania Vilhalba; Ofiço, Arnaldo Vitorino.
Semina ciênc. agrar
; 42(6, supl. 2): 4009-4022, 2021. tab
Artículo
en Inglés
| LILACS, VETINDEX | ID: biblio-1371796
The present study proposes to examine the effect of dietary levels of metabolizable energy, under a fixed nutrientcalorie ratio, on the production performance; body fat and protein deposition; and carcass characteristics of free-range broilers from 1 to 84 days of age. Nine hundred unsexed chicks were allocated to six treatments in a completely randomized design with six replicates of 25 birds each. Treatments consisted of diets with varying levels of metabolizable energy (2700, 2800, 2900, 3000, 3100 and 3200 Kcal ME/kg of diet) and a fixed proportion of nutrients relative to the energy level according to the nutritional requirements for each rearing phase. Body weight, weight gain, feed intake, feed conversion, production viability, metabolizable energy intake, protein intake, lysine intake, body fat deposition, body protein deposition and carcass characteristics were evaluated. Data were subjected to analysis of variance and, later, to regression analysis. Increasing levels of metabolizable energy, coupled with a fixed nutrientcalorie ratio, reduced feed intake, increased body weight and weight gain, improved feed conversion and did not affect carcass characteristics. In conclusion, adjusting the nutrient supply according to the dietary energy level improves production performance by improving feed conversion, ensuring adequate nutrient intake and preserving fat and protein deposition in the carcass when the metabolizable energy level is raised up to 3200 Kcal/kg in all rearing stages.(AU)
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BR68.1
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