title: Digestive evaluation of soy isolate protein as affected by heat treatment and soy oil inclusion in broilers at an early age.
abstract: Soy protein isolate (SPI) mixed with soybean oil (SPIO) incubated at 100°C for 8 h was used to evaluate changes of solubility and digestibility of SPI in vitro and digestive function in broilers at an early age. Arbor Acres broilers were allocated to three groups with six replicates of 12 birds, receiving basal diet (CON), 8 h heat-oxidized SPI diet (HSPI) and 8 h heat-oxidized mixture of SPI and 2% soybean oil diet (HSPIO) for 21 days, respectively. Nitrogen solubility index (NSI) declined and soybean oil accelerated the decline of NSI during incubation (P < 0.05). Decreased in vitro digestibility of dry matter (DM) and crude protein (CP) were observed in SPIO (P < 0.05). HSPI and HSPIO decreased body weight gain, relative jejunum weight and pancreatic trypsin activity at day 21 (P < 0.05). HSPIO decreased anterior intestinal trypsin activity at day 14 and amylase and trypsin activity at day 21, pancreatic amylase activity at day 21 and apparent digestibility of DM, organic matter and CP of broilers from days 18 to 20 (P < 0.05). Heat treatment and soybean oil could induce oxidative modification of SPI, and oxidized SPI negatively affected growth and digestion of broilers. © 2016 Japanese Society of Animal Science.
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China.
authors.forename: Xianglun
authors.initials: X
authors.lastname: Zhang
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Lu
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China.
authors.forename: Wenyue
authors.initials: W
authors.lastname: Xue
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China.
authors.forename: Dawei
authors.initials: D
authors.lastname: Wu
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Wen
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, China. zhouym6308@163.com.
authors.forename: Yanmin
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000375:Aging / Q000502:physiology*; D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000254:growth & development* / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D004063:Digestion; D006358:Hot Temperature / Q000009:adverse effects*; D066298:In Vitro Techniques; D010084:Oxidation-Reduction; D059748:Proteolysis; D012995:Solubility; D013024:Soybean Oil / Q000009:adverse effects; D030262:Soybean Proteins / Q000737:chemistry; D013997:Time Factors
chemical_list: D030262:Soybean Proteins; D013024:Soybean Oil
keywords: broiler; digestion; growth performance; oxidative modification; soy protein isolate