Abstract
This study was conducted to investigate effects of heat-oxidized soy protein isolate (HSPI) on growth performance, serum biochemical indices, apparent nutrient digestibility and digestive function of broiler chickens. A total of 320 1-day-old Arbor Acres chicks were randomly divided into 4 groups with 8 replicates of 10 birds, receiving diets containing soy protein isolate (SPI, control group) or the same amount of SPI heated in an oven at 100°C for 1, 4, or 8 h, for 21 days, respectively. The results indicated that compared with the control group, body weight gain and feed intake of birds fed diet containing SPI heated for 8 h were significantly lower (p<0.05). Serum urea nitrogen concentration was higher in the broilers fed diet containing SPI heated for 4 or 8 h at d 21 (p<0.05). In contrast, serum glucose content was decreased by HSPI substitution at d 21 (p<0.05). The relative pancreas weight in HSPI groups was higher than that in the control group at d 21 (p<0.05). Meanwhile, the opposite effect was observed for relative weight of anterior intestine and ileum in broilers fed a diet containing SPI heated for 8 h (p<0.05). Birds fed diets containing SPI heated for 4 or 8 h had a decreased lipase activity in anterior intestinal content at d 14 and 21 (p<0.05), respectively. In addition, the same effect was also noted in broilers given diets containing SPI heated for 1 h at d 21 (p<0.05). Similarly, amylase, protease and trypsin activity in anterior intestinal content were lower in broilers fed diets containing SPI heated for 8 h at d 21 (p<0.05). The apparent digestibility of dry matter (DM) from d 8 to 10 and DM, crude protein (CP), and ether extract from d 15 to 17 were lower in broilers fed diets containing SPI heated for 8 h (p<0.05). Besides, birds given diets containing SPI heated for 4 h also exhibited lower CP apparent digestibility from d 15 to 17 (p<0.05). It was concluded that HSPI inclusion can exert a negative influence on the growth performance of broilers, which was likely to result from the simultaneously compromised digestive function.
Highlights
Protein has been known to be the most important nutrient in animal feed, providing amino acids for body protein synthesis, and energy for growth (Korhonen et al, 1998)
Soy protein isolate (SPI) heated in an oven at 100°C for 1, 4, and 8 h, respectively, were used in this study and the aim was to determine whether dietary oxidized protein would have any negative effects on the growth performance and digestive function of broilers at early age
Our study has shown that heat-oxidized soy protein isolate (HSPI) inclusion significantly decreased body weight gain of broilers, which was likely the result from simultaneously compromised feed intake rather than similar feed conversion ratio
Summary
Protein has been known to be the most important nutrient in animal feed, providing amino acids for body protein synthesis, and energy for growth (Korhonen et al, 1998). Food protein can be affected by various factors, such as heat, comminuting and grinding, which introduce molecular oxygen and mix oxidants with. Heat-oxidized soy protein isolate (HSPI) caused compromised growth performance and inferior immune function of broilers (Wu et al, 2014). These studies provide evidences that oxidative modification may adversely affect protein digestibility and digestive function of animals. SPI heated in an oven at 100°C for 1, 4, and 8 h, respectively, were used in this study and the aim was to determine whether dietary oxidized protein would have any negative effects on the growth performance and digestive function of broilers at early age
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