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General Information

Document type
  • Peer-reviewed journal article
GE organism
  • maize
GE trait
  • quality
Country
  • USA

Results

Efficacy
  • positive effect
Safety for consumption
  • positive effect

Growing-finishing performance and carcass characteristics of pigs fed normal and genetically modified low-phytate corn Open Access

Spencer, JD; Allee, GL; Sauber, TE
Journal of Animal Science. 2000 June. 78(6):1529-1536

Link to full text (open access, freely available)

PMID: 10875635 ISSN: 0021-8812

Abstract

A genetically modified corn hybrid homozygous for the lpa1 allele, containing low phytate (LP), and its nearly isogenic equivalent hybrid (normal) were compared in two experiments with growing-finishing swine. In Exp. 1, 210 barrows (27 kg) were allotted to one of six dietary treatments with two corn hybrids (LP and normal) and three P feeding regimens. There were five replicate pens (seven pigs/pen) per treatment. Treatments consisted of diets that were supplemented with P throughout the growing-finishing period (.2% P and .15% supplemental P during growing and finishing phases, respectively) or only during the growing phase (.2% supplemental P) or that were not supplemented with P throughout the growing-finishing period. Performance at the end of the growing phase was based on a 2 x 2 factorial arrangement of treatments with two corn hybrids and two levels of added P (0 and .2%). This resulted in 10 replicates for the treatments supplemented with .2% P. The finishing phase (73 to 112 kg) was a 2 x 3 factorial arrangement of treatments with the two types of corn and three regimens of added P during the finishing period. Breaking load (BL) and ash of the fourth metacarpal were evaluated from one pig/pen at the end of the growing phase and from all pigs after slaughter. Pigs fed the LP corn diet without added P had greater body weight gain, feed efficiency, BL, and ash content of the fourth metacarpal than pigs fed the normal corn diet without added P. Performance was similar between pigs fed the LP diet without added P and pigs fed LP and normal corn with added P. In Exp. 2, 1,092 gilts (34 kg body weight) were allotted by weight in a commercial facility to one of three treatments: 1) normal corn/soybean meal diet containing .29% and .22% available P during the growing and finishing phases, respectively; 2) LP corn/soybean meal diet with the same available P level as Treatment 1; and 3) same as Treatment 2 for 8 wk, then no inorganic P supplementation during the finishing phase. All pigs were slaughtered at approximately 122 kg. There were no significant differences in growing-finishing performance or BL among treatments. However, pigs fed diets containing LP corn possessed carcasses with less backfat and a higher percentage of lean (P < .01). These results confirm that the P in LP corn is available to the pig and suggest that pigs fed diets containing this genetically modified corn will have more desirable carcasses.

Keywords

Maize; Performance; Phosphorus; Phytic Acid; Pigs

Funding

Funding source
  • Pioneer Hi-Bred International
  • Optimum Quaity Grains
  • Murphy Family FArms
  • Six State Animal Waste Consortium
  • Missouri Pork Producers Association
  • Missouri Farmers Association
  • Missouri Corn Growers Association.
Funding country
  • United States
Funding type
  • industry: same
  • NGO: same industry aligned

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Cite this study

MLA

Spencer, JD, GL Allee, TE Sauber. "Growing-finishing performance and carcass characteristics of pigs fed normal and genetically modified low-phytate corn." Journal of Animal Science 78.6 (2000): 1529-1536. Web. 15 Nov. 2018.

APA

Spencer, JD., Allee, GL., & Sauber, TE. (2000). Growing-finishing performance and carcass characteristics of pigs fed normal and genetically modified low-phytate corn. Journal of Animal Science, 78(6), 1529-1536.

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