Exigências de lisina digestível para aves de corte da linhagem ISA Label criadas em semiconfinamento

Abstract

RESUMOForam realizados três experimentos para determinar as exigências de lisina digestível para aves da linhagem ISA Label, de ambos os sexos, criadas em semiconfinamento durante as fases: inicial (1 a 28 dias), de crescimento (28 a 56 dias) e final (56 a 84 dias). Em cada experimento, foram utilizadas 480 aves, alojadas em 24 piquetes, cada um contendo abrigo coberto de 3,13m 2 e área de pastejo de 72,87m 2 . O delineamento experimental utilizado foi o inteiramente ao acaso, em esquema fatorial 4x2 (níveis de lisina e sexo) com três repetições de 20 aves cada. Os níveis de lisina digestível avaliados foram: 0,850; 0,970; 1,090 e 1,210% na fase inicial; 0,750; 0,870; 0,990 e 1,110% na fase de crescimento e 0,640; 0,760; 0,880 e 1,000% na fase final. Foram mensuradas as variáveis de desempenho, característica de carcaça, deposição de proteína e gordura corporal, peso e teor de proteína das penas. Com base nos resultados de desempenho, recomendam-se 1, 041; 1,006 e 0,760% de lisina digestível em rações para aves ISA Label nas fases inicial, de crescimento e final, respectivamente. 0.85, 0.97, 1.09, and 1.21% for starter; 0.75, 0.87, 0.99, and 1.11% for growing; and 0.64, 0.76, 0.88

Digestible lysine for broiler chickens with lower genetic potential grown on free-range system

“…These results corroborate those found by Barbosa et al (2002), who identified a reduction in lysine utilization efficiency, and the findings of Nascimento et al (2009), who verified an increase in digestible lysine intake as a function of increased values of lysine in feed rations. The feed intake by chickens did not vary throughthe use of growing values of lysine in the period of 35 to 84 days, which partially explain the increase in lysine intake because of the treatments.On the other hand, although the chickens have responded to the increase in the level of lysine in rations with the greatest rates of weight gain, that did not happen proportionally, what may have led to a worsening in lysine utilization efficiency.…”

“…Nascimento et al (2009) tested increasing values of digestible lysine for free-range broilers, in the period from 28 to 56 days and the best response to weight gain was found with the estimated level of 1.056%. In comparison, Rosa et al (2014) determined 0.908% of digestible lysine in rations for greater weight gain of free-range broilers in this same phase.…”

“…When studying different values of digestible lysine in feed rations for slow growth chickens ISA Label, Nascimento et al (2009) identified higher weight gain, better feed conversion and lower abdominal fat deposition, while Rosa et al (2014) did not identify significant differences for feed conversion; however, they identified an increase in weight gain and greater weight of the carcass and breast.…”

Digestible Lysine on Live Performance of Chicken Type Naked Neck During the Starter Phase

“…These Likewise, in other studies, dietary digestible lysine levels did not influence the feed intake of naked-neck chickens between 1 and 28 days of age (Nascimento et al, 2009) or of Cobb chickens between 8 and 21 days of age (Haese et al, 2012). On the other hand, feed intake and final body weight reductions were observed in naked-neck chickens between 1 and 28 days of age when dietary digestible lysine levels increased (Oliveira et al, 2013).…”

“…However, according to Nascimento et al (2009), higher lysine intakes could promote higher muscle deposition and lower carcass fat accumulation, resulting in better FCR in chickens. Lower FCR for males and females broiler chickens were previously estimated at dietary lysine levels of 1.22 and 1.24%, respectively (Bernal et al, 2014).…”