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- W1760492702 abstract "Seventy-two finishing pigs (initial weight = 57.6 kg) were utilized to determine the effects of porcine somatotropin (pST) and dietary lysine level on growth performance and carcass characteristics. Pigs were injected daily with 4 mg pST in the extensor muscle of the neck and fed either a pelleted corn-sesame meal diet (.6% lysine, 17.8% CP) or diets containing .8, 1.0, 1.2 or 1.4% lysine provided by additions of L-lysine·HCl. All diets were formulated to contain at least twice the required amounts of other amino acids. Control pigs received a placebo injection and the .6%-lysine diet. Increasing levels of dietary lysine resulted in increased ADG and improved feed conversion (quadratic, P < .01) for pST-treated pigs. The calculated daily lysine intake was 16.6, 13.6, 19.6, 25.1, 29.6 and 33.6 g for the control and pST-treated pigs fed .6, .8, 1.0, 1.2 and 1.4% lysine, respectively, over the entire experiment. Breakpoint analysis indicated that cumulative ADG and feed conversion were optimized at 1.19 and 1.22% lysine, respectively. Longissimus muscle area and trimmed ham and loin weights increased as dietary lysine was increased among pST-treated pigs (quadratic, P < .01). Breakpoint analysis indicated that 1.11% lysine maximized longissimus muscle area, whereas trimmed ham and loin weights were maximized at .91 and .98% lysine, respectively. Adjusted backfat thickness was not affected by dietary lysine, but pST-treated pigs had less backfat (P < .05) than control pigs did. Percentage moisture of the longissimus muscle increased (linear, P < .05), as did percentage CP (quadratic, P < .05), whereas fat content decreased (linear, P < .05) as lysine level increased. Similar trends in composition were observed for muscles of the ham (semimembranosus, semitendinosus, and biceps femoris). Shear-force values from the longissimus and semimembranosus were lowest for control pigs, but they increased as dietary lysine level increased among pST-treated pigs. Sensory panel evaluations indicated that juiciness and tenderness decreased (linear, P < .05) as dietary lysine level increased. Plasma urea concentrations decreased linearly (P < .01) on d 28 as lysine level increased, whereas plasma lysine and insulin were increased (quadratic, P < .01). Plasma glucose and free fatty acid concentrations on d 28 tended to increase (quadratic, P < .10) with increasing dietary lysine level. (ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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- W1760492702 title "The effects of porcine somatotropin and dietary lysine on growth performance and carcass characteristics of finishing swine." @default.
- W1760492702 doi "https://doi.org/10.2527/1990.68103261x" @default.
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