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J Anim Sci. 1996 May;74(5):1056-62.

Lysine requirement of the lactating sow determined by using plasma urea nitrogen as a rapid response criterion.

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1
Department of Animal Science, Iowa State University, Ames 50011, USA.

Abstract

The dietary lysine requirement of adult sows nursing 10 pigs was estimated by using plasma urea nitrogen (PUN) concentration as a rapid response criterion. A preliminary experiment indicated that a 3-d feeding time is required to re-equilibrate PUN concentrations after a change in the dietary concentration of lysine. In the main experiment, 12 sows (BW = 219 +/- 5 kg; parity = 4.5 +/- .3; ultrasound backfat = 21.3 +/- .9 mm) were used in two 6 x 6 Latin squares. Treatments consisted of dietary lysine intakes (30.2, 36.9, 43.6, 50.3, 57.0, and 63.7 g/d) that were assigned to six 4-d periods and to six sows in each square. Diets provided adequate levels of all nutrients other than lysine. The treatment periods started on d 5 of lactation and ended on d 29. Plasma urea N concentrations were determined on the 3rd and 4th d of each of the six 4-d treatment periods. Plasma urea N concentrations decreased quadratically (P < .02) with, increasing dietary lysine intakes. A two-slope, broken-line regression model was used to estimate the dietary lysine intake that minimizes PUN concentrations. The results indicated that adult sows nursing 10-pig litters with an average growth of 2.22 kg/d required 55.3 g/d of dietary total lysine to minimize PUN concentrations and, therefore, presumably to minimize body protein mobilization.

PMID:
8726737
DOI:
10.2527/1996.7451056x
[Indexed for MEDLINE]

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