BERTOL, T. M.

ELLERY, E. A. C.

LOPES, L. dos S.

LUDKE, J. V.

LUDKE, M. do C. M. M.

MARINHO, A. L.

SANTOS FILHO, J. I. dos

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Digestible lysine requirement of pigs from 60 to 90 kg live weight   Andreza L. Marinho*1, Teresinha M. Bertol2, Jorge V. Ludke2, Maria do Carmo M. M. Ludke3, Jonas I. Santos Filho2, Leticia S. Lopes4, Everardo A. C. Ellery5 *Doctoral student, Universidade Federal Rural de Pernambuco; wo/nr, Dom Manoel de Medeiros Str., Dois Irmãos District; Recife, Zip Code 52171-900, PE, Brazil; 2Scientific Researcher, Embrapa Swine & Poultry Research Center, Concórdia, SC; 3Teacher/Adviser, Universidade Federal Rural de Pernambuco, Recife, PE; 4Analyst/Statistician, Embrapa Swine & Poultry Research Center, Concórdia, SC; 5Master student, Universidade Federal do Ceará, Fortaleza, CE   *andrezazte@hotmail.com  Three experiments were carried out with the aim to establish pig digestible lysine requirements from 60 to 90 kg live weight. One hundred and twenty pigs of three genders were used (n=40 for each gender) with average weight of 59.95 ± 2.01 kg for gilts, 60.33 ± 2.06 kg for barrows and 59.24 ± 2.12 kg for boars. The pigs were from the progeny of Embrapa MS-115 sire line crossed with F1 sows. In each experiment (gender), the pigs were sorted, considering initial weight, in one of five levels of digestible lysine, with eight replicates and one pig per experimental unit. The lysine levels evaluated were: 0.56, 0.70, 0.84, 0.98, 1.12% for gilts, 0.52, 0.66, 0.80, 0.94, 1.08% for barrows and 0.64, 0.78, 0.92, 1.06, 1.20% for boars. Experimental period lasted 35 days for gilts and boars and 28 days for barrows. The variables evaluated were: daily weight gain (GPD, kg), daily feed consumption (CRD, kg), feed to gain ratio (CA, kg kg-1), daily lysine consumption (CLD, g), lysine intake to gain ratio (CLGP, g kg-1), and lysine efficiency for weight gain (ELGP, g g-1). Statistical analysis was performed using SAS GLM procedure. There were no treatment effects (P>0.05) on CRD in the three genders and on GPD for boars. The GPD showed a quadratic increase for barrows (y = 0.3296 + 1.6756x – 0.8711x2, P<0.08 and R2 = 0.65) and linear increase for gilts (y = 0.7312 + 0.2647x, P<0.003 and R2 = 0.55). The CLD increased linearly (P<0.001) and the following equations were adjusted: y = -1.2457 + 27.2702x (R2 = 0.93) for gilts, y = -0.3204 + 29.6502x (R2 = 0.97) for barrows, and y = 2.6138 + 22.8827x (R2 = 0.91) for boars. CA showed quadratic responses to the digestible lysine levels with y = 5.4385 – 6.1632x + 3.2961x2 (P<0.002 and R2 = 0.68) for gilts, and y = 4.2371 – 23.4778x + 1.6925x2 (P<0.03 and R2 = 0.58) for boars, and linear effect y = 3.2460 – 0.6475x (P<0.002 and R2 = 0.63) for barrows. A quadratic response of CLGP to the digestible lysine levels was observed (y = 17.3601 – 12.3581x + 20.9339x2, P<0.02 and R2 = 0.93) for gilts and linear response with y = 3.5512 + 22.5239x (P<0.001 and R2 = 0.94) for barrows and y = 3.5548 + 18.9167x (P<0.0001 and R2 = 0.81) for boars. ELGP had linear responses for gilts with y = 84.5697 – 45.5511x (P<0.0001 and R2 = 0.94) and for boars with y = 90.1539 – 45.5999x (P<0.0001 and R2 = 0.81) and quadratic effect for barrows with y = 116.7712 – 123.0063x + 44.6062x2 (P<0.006 and R2 = 0.95). Considering the GPD, the recommended digestible lysine level for barrows is 0.96%, corresponding to a daily lysine intake of 28.14 g. Based on CA, the recommended digestible lysine levels for gilts and boars are 0.95 and 1.03%, respectively, with corresponding estimated daily digestible lysine consumption of 24.93 and 26.41 g. Keywords: amino acid, barrows, boars, gilts, performance, swine nutrition  Acknowledgments: Doctoral fellowship from CAPES granted to the first author.         

Digestible lysine requirement of pigs from 60 a 90 kg live weight.

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