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This Article Full Text (PDF) All Versions of this Article: jas.2008-1325v1 87/4/1502    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hinson, R. B. Articles by Richert, B. T. Search for Related Content PubMed PubMed Citation Articles by Hinson, R. B. Articles by Richert, B. T.

Effect of feeding reduced crude protein and phosphorus diets on wean-finish pig growth performance, carcass characteristics, and bone characteristics

R. B. Hinson^*, A. P. Schinckel^*, J. S. Radcliffe^*, G. L. Allee, A. L. Sutton^* and B. T. Richert^*

^* Department of Animal Science, Purdue University, West Lafayette, IN Department of Animal Sciences, University of Missouri, Columbia, MO

brichert{at}purdue.edu

Abstract

Two experiments were conducted to determine effects of feeding a corn-soybean meal based diet (CTL) or a low nutrient excretion (LNE) diet, formulated with reduced dietary CP and additional synthetic AA, low phytic acid corn, and phytase, on pig growth performance during the grower (BW = 32 to 77 kg) and finisher (BW = 78 to 126 kg) periods, and carcass and bone characteristics at slaughter. Pigs (32 ± 1.3 kg BW, Exp. 1; 6.7 ± 0.27 kg BW, Exp. 2) were blocked by sex and BW and randomly allotted to a CTL or LNE diets. Pigs were housed in 4 rooms during the nursery period and 2 rooms during the grower and finisher periods, with individual and identical ventilation systems. Pigs were phase fed 3 nursery diets for 5-wk (Exp. 2) and phase fed 2 grower and 2 finisher diets for 16 wk (Exp. 1 and 2). Pigs were housed 4 or 5 pigs/pen with 9 pens·sex^-1·treatment^-1during the nursery period and 4 or 5 pigs/pen with 5 pens·sex^-1·treatment^-1 in the grower phase and 2 or 3 pigs/pen in the finisher phase. Individual BW and pen feed disappearance were recorded weekly in the nursery and every 2 wk in the grower-finisher periods. Pigs were ultrasonically scanned at d 34 of the nursery and wk 8 and 16 of the grower-finisher period to determine backfat depths and LM area. Ten pigs·sex^-1·treatment^-1 were harvested at wk 16 of each experiment for determination of carcass characteristics. Overall growth performance was not different during each experiment. However, nursery G:F (CTL, P = 0.65, LNE, P = 0.60), grower ADG (Exp. 1 and 2), and grower G:F (Exp. 2) were reduced (P < 0.05) with the feeding of the LNE diets. Diet had no effect on 10^th ribbed carcass data in either experiment. Metatarsal bone ash percent was reduced (P < 0.05) when the LNE diets were consumed in both experiments. Feeding LNE diets resulted in the maintenance of overall growth performance, bone parameters, and carcass characteristics. However, further refinements are still required in the nursery and grower phases of pig production to optimize LNE diet utilization by the swine industry.

Key Words: bone characteristics • carcass composition • crude protein • low-phytate corn • pig growth • phosphorus