Abstract
Abstract A total of 1,156 PIC 800-sired pigs (12.4 kg BW) were used in a 27-day experiment to estimate the SID lysine requirement of pigs ranging from 12.4 to 31.3 kg BW. Forty-eight pens of mixed sex pigs were used. Pens were blocked by location within the barn, with barrow and gilt numbers in pens kept consistent within block. Pens were allotted to one of five dietary treatments in a randomized design with 9 to 10 replicate pens (10 pens for treatments 1, 3, 5 and 9 pens for treatments 2, 4) per treatment. Dietary SID lysine concentrations evaluated were 1.12, 1.19, 1.26, 1.33, and 1.40%. Diets were corn-soybean meal-based and formulated to equal NE concentrations across treatment. Data were analyzed using a general linear model. Orthogonal contrasts with coefficients for equally spaced treatments were used to analyze for linear and quadratic effects. For significant quadratic effects, breakpoint analysis was conducted (two slope regression or quadratic broken line analysis) using nonlinear regression analysis to estimate for SID lysine requirement. A linear (P < 0.05) response was observed for BW to increase as SID lysine level in the diet increased. Increasing SID lysine increased average daily gain (ADG) quadratically (P = 0.05) with a plateau observed above 1.357% SID Lys. Additionally, increased SID lysine yielded a quadratic effect on G:F (P < 0.05) with a plateau above 1.327% SID lysine. There was a quadratic response (P < 0.05) observed for cost of gain (COG), with no benefit to COG when feeding above 1.201% SID lysine. However, there was a linear response (P < 0.05) observed for return over feed cost (ROFC) as SID lysine increased due to increased BW. There was no effect of SID lysine level fed on feed intake or mortality and morbidity. These data indicate that the estimated SID lysine requirement for PIC 800-sired pigs ranging from 12.4 to 31.3 kg to be 1.327 and 1.357 for optimal feed efficiency and ADG, respectively.
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