Artículos de revistas
Digestible lysine levels in diets for pigs from 24 to 50 kg under sanitary segregation
Fecha
2012-09-01Registro en:
Revista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 41, n. 9, p. 2039-2047, 2012.
1516-3598
10.1590/S1516-35982012000900011
S1516-35982012000900011
WOS:000311562800011
S1516-35982012000900011.pdf
7728883010098049
Autor
Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
Instituto de Zootecnia
Institución
Resumen
This study evaluated the relationship between digestible lysine and metabolizable energy for barrow and gilts from 24 to 50 kg. Performance, digestibility and blood profile were studied. The experimental design was of randomized blocks, with five treatments, eight replicates and two animals per experimental unit in the performance assay and four replicates and one animal per experimental unit in the digestibility assay. The blood profile was chosen at 20 random animals of each sex, with four replicates per treatment and the animal as experimental unit. The treatments were 0.80, 0.90, 1.00, 1.10 and 1.20% digestible lysine. There was a linear effect of lysine levels on weight gain and feed conversion in females and crude protein in both sexes, gross energy excreted in the urine (kcal) and digestible energy (kcal). A quadratic effect of the amino acid studied in the daily consumption of crude protein (g) in both sexes, weight gain and feed conversion of barrows, as well as the nitrogen excreted in the urine (g) and nitrogen retained, and absorbed and retained. The relationship between neutrophils and lymphocytes had quadratic responses with increasing levels of lysine. The maximum performance for the studied genotype was obtained with 0.88 and 0.91% of digestible lysine or 2.60 and 2.67 g of digestible lysine/Mcal of metabolizable energy for females and barrows, respectively, corrected for digestibility trial.