Níveis de lisina digestível em rações, utilizando-se o conceito de proteína ideal, para suínos machos castrados de alto potencial genético para deposição de carne magra na carcaça dos 60 aos 95 kg

Abstract

RESUMO-Objetivou-se determinar o efeito de níveis de lisina digestível, utilizando-se o conceito de proteína ideal, sobre o desempenho e as características de carcaça de 40 leitões machos castrados (peso inicial de 30,02 + 1,38 kg e peso final 60,44 + 1,81 kg) de alto potencial genético para deposição de carne magra. Os animais foram distribuídos em delineamento de blocos ao acaso, com quatro tratamentos, cinco repetições e dois animais por unidade experimental. Os tratamentos consistiram de uma ração basal (18,08% de PB e 3.250 kcal de EM/kg) suplementada com L-lisina HCL, resultando em rações com 0,80; 0,90; 1,00 e 1,10% de lisina digestível. As rações foram suplementadas com níveis crescentes de aminoácidos sintéticos, mantendo-se constantes as relações entre os níveis desses aminoácidos essenciais e os de lisina, com base na digestibilidade verdadeira. Não houve efeito dos tratamentos sobre o consumo de ração, o ganho de peso diário e a concentração de uréia no plasma dos animais. Observou-se comportamento linear da conversão alimentar, que melhorou, e do consumo de lisina digestível diário, que aumentou em função dos níveis de lisina digestível da ração. Os tratamentos não influenciaram as porcentagens de água, proteína e gordura e a deposição de gordura na carcaça dos animais. Os níveis de lisina digestível afetaram de forma linear crescente a deposição de proteína na carcaça. O nível de 1,10% de lisina digestível, correspondente a um consumo de lisina digestível de 21,94 g/dia (3,43 g de Lis/Mcal de EM) proporcionou os melhores resultados de desempenho e características de carcaça de suínos machos castrados de alto potencial genético dos 30 aos 60 kg. Palavras-chave: aminoácidos, carcaça, fase de crescimento, genótipo, uréia Dietary digestible lysine requirements, based on the ideal protein concept, for barrows with high genetic potential from 30 to 60 kg ABSTRACT-The effect of increasing dietary digestible lysine levels, based on the ideal protein concept, on performance and carcass characteristics of forty barrows with high genetic potential for lean gain averaging initial and final body weights of 30.02 + 1.38 kg and 60.44 + 1.81 kg, respectively, was evaluated in this experiment. The animals were assigned to a randomized blocks design, with four treatments, five replicates and two animals per experimental unit. The treatments consisted of a basal diet (18.08% of CP and 3,250 kcal of ME/kg) supplemented with increasing levels of HCL-L-lysine (0.80, 0.90, 1.00, and 1.10% of digestible lysine). The diets were supplemented with constant synthetic amino acids:lysine ratios based on the true digestibility. No treatment effects on feed intake, daily weight gain and plasma urea concentration were observed. Feed:gain ratio and digestible lysine intake increased linearly as the dietary digestible lysine levels increased. No significant treatment effects on percentages of water, protein and fat and carcass fat deposition were observed. It was observed increasing linear effect of treatments on carcass protein dep...

Ractopamine and lysine levels on performance and carcass characteristics of finishing pigs

“…The results of average daily weight gain were similar to those obtained by Oliveira et al (2003a,b) who observed pigs of 110 to 125 kg and 95 to 110 kg. However, the results differ from those reported by Abreu et al (2007), who observed a quadratic effect of diets on average daily weight gain, where the maximal response was obtained with 0.87% lysine and 3,250 kcal/kg, which corresponded to a daily intake of 24.67 g/day.…”

“…Similar results were found by Carr et al (2005a), Marino et al (2007a, b) and Amaral et al (2009). Based on these results, we can infer that pigs fed diets supplemented with ractopamine have more efficient use of feed per unit weight gain than pigs that are fed diets without supplementation.…”

“…The increase in average daily weight gain was 6.6% for animals that consumed ractopamine, which is a result similar to that reported by Amaral et al (2009), in which ractopamine improved 8.4% with this variable. Carr et al (2005a) and Marino et al (2007b) also demonstrated a positive effect on average daily weight gain with ractopamine in diets for finishing pigs.…”

“…Similar results also occurred in studies by Marino et al (2007a, b), Amaral et al (2009) and Kiefer & Sanches (2009). According to these authors, supplementation in finishing pig diets with ractopamine improves weight gain and efficiency of lean meat without changing the daily diet.…”

Efecto de los niveles de lisina digestible sobre el rendimiento de cerdos en crecimiento de 45 a 70 kg de peso alimentados con raciones conteniendo subproductos de arroz

“…Rostagno et al (2005) recomiendan niveles de lisina digestible para cerdos de alto potencial genéti-co como 0,679% para cerdos en crecimiento de los 50 a los 70 kg de peso. Abreu et al (2007) estimaron en 0,93% el requerimiento de lisina digestible para cerdos de 60-95 kg de alto potencial genético para deposición de carne magra y Moreira et al (2004) recomiendan 0,75% de lisina total para cerdos machos en crecimiento.…”