| Glycemic index of starch affects nitrogen retention in grower pigs. | |
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MedLine Citation:
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PMID: 21984722 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Three studies were performed to examine the effect of starch and protein digestion rate on N retention in grower pigs. In Exp. 1, the glycemic index (GI) of corn, a malting barley, and a slow rumen-degradable barley (SRD-barley) were measured using 6 barrows (BW = 18.0 ± 0.5 kg). The GI of malting barley was greater (P < 0.05) than that of SRD-barley (71.1 vs. 49.4), and the GI of both barley cultivars was lower (P < 0.05) than that of corn (104.8). In Exp. 2, the standardized ileal digestibility (SID) of AA and DE content of the 3 ingredients were determined using 5 ileal-cannulated barrows (BW = 20.7 ± 2.3). The apparent total tract energy digestibility of corn (86.1%) and malting barley (85.7%) were greater (P < 0.05) than SRD-barley (82.3%). The standardized ileal digestibility of Lys was 94.0, 92.6, and 92.4% for corn, malting barley, and SRD-barley, respectively, and did not differ among grains. In Exp. 3, 6 diets were formulated to equal DE (3.40 Mcal/kg), SID Lys (8.6 g/kg), starch (424.9 g/kg), and digestible CP (180.0 g/kg) using values obtained in Exp. 2. Three GI (high, corn; medium, malting barley; and low, SRD-barley) and 2 rates of protein digestion [rapid, soy protein hydrolysate (SPH); and slow, soy protein isolate (SPI)] were tested in a 3 × 2 factorial arrangement with 36 barrows (BW = 32.2 ± 2.5 kg). Pigs were fed 3.0 × maintenance energy requirement daily in 2 meals for 2 wk and housed in metabolic crates to collect feces and urine separately. At the end of the study, intestinal contents were collected from 4 equal-length segments of the small intestine. The percentage of unabsorbed CP in segment 1 relative to dietary CP was greater (P < 0.05) for SPI than SPH diets (170.3 vs. 116.5%). The percentage of unabsorbed starch in segments 1 and 2 was greater (P < 0.05) for SRD-barley than malting barley or corn diets. Nitrogen intake and fecal N excretion were greater (P < 0.05) for pigs fed the malting barley and SRD-barley diets than for pigs fed the corn diet. Urinary N excretion was greater (P < 0.05) for pigs fed SRD-barley diets compared to pigs fed the corn or malting barley diets. Pigs fed slowly digestible starch (SRD-barley; 46.6%) had lower (P < 0.05) net N retention than pigs fed corn or malting barley (54.7 and 54.1%, respectively). In conclusion, slowly digestible starch sources such as SRD-barley may not be suitable to support maximum protein deposition in restricted-fed grower pigs. |
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Authors:
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M D Drew; T C Schafer; R T Zijlstra |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-10-7 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-10-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, SK S7N 5A8, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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