Digestible lysine for 63 to 103 day-old barrows of genetic lines selected for lean deposition

Abstract

-Ninety-six barrows from 63 to 103 days of age were used to evaluate the effects of dietary digestible lysine levels on performance and carcass traits of two genetic lines selected for lean deposition. Pigs with initial body weight of 23.800 ± 1.075 kg were allotted in a completely randomized block design, within a 4 × 2 factorial arrangement (four digestible lysine levels: 0.80, 0.90, 1.00, 1.10%, and two genetic lines), with six replicates and two pigs per experimental unit. There was no interaction between genetic and digestible lysine levels. The digestible lysine levels also did not influence performance or carcass traits of pigs; however, average daily lysine intake increased with increasing digestible lysine level in the experimental diets. Pigs from genetic line B had better carcass traits when compared with those from genetic line A. The level of 0.80% digestible lysine corresponding to a daily intake of 16.60 g digestible lysine meets the nutritional requirement of pigs from both genetic lines evaluated, from 63 to 103 days of age.

Evaluation of Digestible lysine levels in diets with high energy density for finishing pigs

“…Studies conducted on finishing pigs fed with deficient diets or ajusted to the lysine requirement and containing 3.4 Mcal/ kg of EM have also shown that there is no effect of dietary lysine level on DFI and DWG (12). Even in growing pigs, fed with lower energy density diets, the effect of lysine on the productive performance has not been observed (3,23). According to those reported by several authors (4,12,13,23,24), the DFI is a variable that generally is not affected by the content of lysine in the diet, response that is observed when the diets are isocaloric and the daily intake of lysine increases linearly with the content of lysine in the diet, such as in the case of the present study.…”

“…Además, la cantidad de un aminoácido y la densidad energética en esas dietas determinan la deposición de proteína y grasa en la canal porcina (2). La lisina es el primer aminoácido limitante en dietas para cerdos, y se utiliza como referencia en la formulación considerando los valores recomendados de lisina digestible estandarizada para estimar los requerimientos de los otros aminoácidos esenciales y garantizar un óptimo crecimiento y rendimiento en carne magra (3)(4)(5). Se recomienda 0.52% de lisina digestible en la dieta de cerdos en etapa de finalización entre 80 y 120 kg de peso (6).…”

“…Also, the amount of an amino acid and energy density in these diets determine the deposition of protein and fat in the pork carcass (2). Lysine is the first limiting amino acid in pig diets, and is used as a reference in the formulation, considering the recommended levels of standardized digestible lysine to estimate the requirements of other essential amino acids and guarantee optimum growth and yield in lean meat (3)(4)(5). For finishing pigs between 80 and 120 kg of weight, 0.52% dietary digestible lysine is recommended (6).…”

Planos nutricionais de lisina para suínos da fase inicial a terminação

“…Para maximizar a deposição de carne na carcaça são necessárias dietas devidamente balanceadas em aminoácidos (Fortes et al, 2011). Dentre os aminoácidos, o teor de lisina digestível é considerado referência em dietas a base de milho e farelo de soja para avaliação do desempenho de suínos destinados ao abate.…”

“…A maioria das pesquisas desenvolvidas para avaliar o efeito de planos de nutrição utilizam animais do mesmo sexo como machos castrados (Souza Filho et al, 2000;Fortes et al, 2011), fêmeas (Kill et al, 2003) ou machos imunocastrados (Kiefer et al, 2011). Porém na prática, observa-se que várias granjas comerciais adotam a criação dos suínos em lotes mistos de machos castrados e fêmeas.…”