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Energy, amino acid, and phosphorus digestibility of phytase transgenic corn for growing pigs.
J Anim Sci. 2013 Jan; 91(1):298-308.JA

Abstract

Three experiments were conducted to evaluate energy, AA, and P digestibility in a phytase transgenic corn (PTC) containing a phytase gene (phyA2) isolated from Aspergillus niger compared with a nontransgenic near-isoline conventional corn (CC) grown in the same environmental conditions for growing pigs. Experiment 1 was an energy balance experiment conducted to measure DE and ME in PTC and CC. Eighteen growing barrows (initial BW 25.8±0.3 kg) from 9 litters were allotted by BW and litter to 1 of 2 dietary treatments with 9 pigs per treatment in a randomized complete block design. Pigs were individually placed in metabolism cages and fed diets based on the 2 corns. The DE and ME in PTC (3,967 and 3,941 kcal/kg of DM, respectively) were greater (P<0.05) than those in CC (3,917 and 3,848 kcal/kg of DM, respectively). Experiment 2 was conducted to measure apparent ileal digestibility (AID) and standardized ileal digestibility (SID) values of CP and AA in the 2 corns. Eighteen growing barrows (initial BW 41.8±0.7 kg) were equipped with a T-cannula in the distal ileum. Pigs were placed in metabolism cages in a completely randomized design with 3 dietary treatments of 6 pigs each. An N-free diet was used to estimate basal endogenous losses of CP and AA. The AID and SID values for CP and all AA did not differ between the 2 corns. Experiment 3 was conducted to measure apparent total tract digestibility (ATTD) and standardized total tract digestibility (STTD) values of P in the 2 corns. Eighteen growing pigs (initial BW 30.5±0.5 kg) from 6 litters were placed in metabolism cages in a randomized complete block design with 3 dietary treatments of 6 pigs each based on BW and litter. Two diets were based on the 2 corns, and a P-free diet was used to measure endogenous P losses. The ATTD and STTD values of P were greater (P<0.05) in the PTC diet (71.4% and 76.9%, respectively) than those in the CC diet (27.6% and 33.4%, respectively). Pigs fed the PTC diet had a greater (P<0.05) P retention (70.7%) than those fed the CC diet (27.1%). It was concluded that PTC had a greater digestibility of energy and P than CC for growing pigs. As a consequence, if PTC replaces CC in a pig diet, the DE and ME in the diet will increase, and less inorganic P will need to be supplemented to the diet, and thus P excretion in manure will be decreased.

Authors+Show Affiliations

Department of Animal Science, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23100575

Citation

Li, S F., et al. "Energy, Amino Acid, and Phosphorus Digestibility of Phytase Transgenic Corn for Growing Pigs." Journal of Animal Science, vol. 91, no. 1, 2013, pp. 298-308.
Li SF, Niu YB, Liu JS, et al. Energy, amino acid, and phosphorus digestibility of phytase transgenic corn for growing pigs. J Anim Sci. 2013;91(1):298-308.
Li, S. F., Niu, Y. B., Liu, J. S., Lu, L., Zhang, L. Y., Ran, C. Y., Feng, M. S., Du, B., Deng, J. L., & Luo, X. G. (2013). Energy, amino acid, and phosphorus digestibility of phytase transgenic corn for growing pigs. Journal of Animal Science, 91(1), 298-308. https://doi.org/10.2527/jas.2012-5211
Li SF, et al. Energy, Amino Acid, and Phosphorus Digestibility of Phytase Transgenic Corn for Growing Pigs. J Anim Sci. 2013;91(1):298-308. PubMed PMID: 23100575.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Energy, amino acid, and phosphorus digestibility of phytase transgenic corn for growing pigs. AU - Li,S F, AU - Niu,Y B, AU - Liu,J S, AU - Lu,L, AU - Zhang,L Y, AU - Ran,C Y, AU - Feng,M S, AU - Du,B, AU - Deng,J L, AU - Luo,X G, Y1 - 2012/10/16/ PY - 2012/10/27/entrez PY - 2012/10/27/pubmed PY - 2013/9/5/medline SP - 298 EP - 308 JF - Journal of animal science JO - J Anim Sci VL - 91 IS - 1 N2 - Three experiments were conducted to evaluate energy, AA, and P digestibility in a phytase transgenic corn (PTC) containing a phytase gene (phyA2) isolated from Aspergillus niger compared with a nontransgenic near-isoline conventional corn (CC) grown in the same environmental conditions for growing pigs. Experiment 1 was an energy balance experiment conducted to measure DE and ME in PTC and CC. Eighteen growing barrows (initial BW 25.8±0.3 kg) from 9 litters were allotted by BW and litter to 1 of 2 dietary treatments with 9 pigs per treatment in a randomized complete block design. Pigs were individually placed in metabolism cages and fed diets based on the 2 corns. The DE and ME in PTC (3,967 and 3,941 kcal/kg of DM, respectively) were greater (P<0.05) than those in CC (3,917 and 3,848 kcal/kg of DM, respectively). Experiment 2 was conducted to measure apparent ileal digestibility (AID) and standardized ileal digestibility (SID) values of CP and AA in the 2 corns. Eighteen growing barrows (initial BW 41.8±0.7 kg) were equipped with a T-cannula in the distal ileum. Pigs were placed in metabolism cages in a completely randomized design with 3 dietary treatments of 6 pigs each. An N-free diet was used to estimate basal endogenous losses of CP and AA. The AID and SID values for CP and all AA did not differ between the 2 corns. Experiment 3 was conducted to measure apparent total tract digestibility (ATTD) and standardized total tract digestibility (STTD) values of P in the 2 corns. Eighteen growing pigs (initial BW 30.5±0.5 kg) from 6 litters were placed in metabolism cages in a randomized complete block design with 3 dietary treatments of 6 pigs each based on BW and litter. Two diets were based on the 2 corns, and a P-free diet was used to measure endogenous P losses. The ATTD and STTD values of P were greater (P<0.05) in the PTC diet (71.4% and 76.9%, respectively) than those in the CC diet (27.6% and 33.4%, respectively). Pigs fed the PTC diet had a greater (P<0.05) P retention (70.7%) than those fed the CC diet (27.1%). It was concluded that PTC had a greater digestibility of energy and P than CC for growing pigs. As a consequence, if PTC replaces CC in a pig diet, the DE and ME in the diet will increase, and less inorganic P will need to be supplemented to the diet, and thus P excretion in manure will be decreased. SN - 1525-3163 UR - https://www.unboundmedicine.com/medline/citation/23100575/Energy_amino_acid_and_phosphorus_digestibility_of_phytase_transgenic_corn_for_growing_pigs_ L2 - https://academic.oup.com/jas/article-lookup/doi/10.2527/jas.2012-5211 DB - PRIME DP - Unbound Medicine ER -