Digestible lysine levels in diets supplemented with ractopamine

Abstract

In order evaluate digestible lysine levels in diets supplemented with 20 ppm of ractopamine on the performance and carcass traits, 64 barrows with high genetic potential at finishing phase were allotted in a completely randomized block design with four digestible lysine levels (0.80, 0.90, 1.00, and 1.10%), eight replicates and two pigs per experimental unit. Initial body weight and pigs' kinship were used as criteria in the blocks formation. Diets were mainly composed of corn and soybean meal supplemented with minerals, vitamins and amino acids to meet pigs' nutritional requirements at the finishing phase, except for digestible lysine. No effect of digestible lysine levels was observed in animal performance. The digestible lysine intake increased linearly by increasing the levels of digestible lysine in the diets. Carcass traits were not influenced by the dietary levels of digestible lysine. The level of 0.80% of digestible lysine in diets supplemented with 20 ppm ractopamine meets the nutritional requirements of castrated male pigs during the finishing phase

Lisina digestível para suínos machos castrados submetidos a estresse por calor dos 95 aos 115 kg

“…Dados similares foram obtidos por Batista et al (2011), estudando o aumento dos níveis de lisina digestível para suínos em crescimento mantidos em ambientes de estresse por calor, os quais determinaram 1,05% de lisina digestível. De acordo com Souza et al (2011), o maior ganho de peso possivelmente se dá pela máxima expressão gênica para esta característica, (SOUZA et al, 2011). Como já era de se esperar o consumo de ração não afetou os níveis de lisina digestíveis, visto que este consumo foi controlado dentro das repetições.…”