Different ratios of arginine: lysine on performance, skin quality and creatine levels of broiler chickens fed diets reduced in protein content

• Ano de defesa: 2022
• Autor(a) principal: Oliveira, Carlos Henrique de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa; Zootecnia
• Palavras-chave em Português: Frango de corte; Alimentação e rações; Arginina; Lisina; Nutrição e alimentação animal
• Link de acesso: https://locus.ufv.br//handle/123456789/30249; https://doi.org/10.47328/ufvbbt.2022.533

Two trials were carried out to assess different ratios of digestible arginine: lysine on growth performance, skin quality and creatine levels in muscle and serum of broiler chickens fed diets reduced in protein content. A total of 1,540 Cobb500TM male chickens were used in each trial, and were distributed into 7 treatments, with 10 replicates with 22 birds each. The experimental diets were based on corn and soybean meal, and a control diet was formulated to satisfy broiler nutritional requirements. A basal diet with reduced protein content was formulated to meet broiler nutritional requirements, except for SID Arg levels. The experimental diets were obtained by adding L-arginine to basal diets, meeting six different SID Arg:Lys ratios (94, 100, 106, 112, 118 and 124%). Body weight, body weight gain, average daily feed intake, and feed conversion ratio were evaluated from 01 to 21 days old (trial 1) and from 22 to 44 days old (trial 2). At 21 and 44 days, in trials 1 and 2, respectively, birds were slaughtered to assess skin thickness (ST), skin strength (SS), creatine level in muscle (CRM) and serum (CRS). Data were subjected to ANOVA, and treatments were compared to the control group by Dunnett’s test (P≤0.05). Regression analyses were performed to model the variables assessed and the ratios of SID Arg: Lys. The SID Arg: Lys ratios did not affect ADFI of broilers in both trials (P>0.05), whereas it linearly increased the BW, BWG, and ST, in both trials (P<0.001). The FCR of broilers linearly decreased, in trial 1 (P = 0.038) and trial 2 (P<0.001). The CRM of birds had a linear effect (P<0.001) in trial 1, and a quadratic effect (P=0.001) in trial 2. The CRS and SS of broilers linearly increased, in trial 2 (P<0.001). In conclusion, increasing SID Arg:Lys ratios in diets reduced CP enhanced growth performance, skin quality and CR levels in muscle and serum of broiler chickens from 01 to 21 and 22 to 44 days old. Keywords: Essential Amino Acid. Reduced Crude Protein Content. Broiler. Skin Quality. Creatine Level.