Use of Soy Protein Concentrate in Pre-Starter and Starter Diets for Broilers

Abstract

Two experiments were carried out to evaluate the effect of using soy protein concentrate (SPC) in pre-starter and starter diets for broilers. In the first experiment, 600 male Cobb broilers, between one and 40 days of age, were distributed in a completely randomized design, with four treatments and six replications of 25 birds each. Treatments were ofered to broilers in the pre-starter and starter diets and consisted of inclusion of soy protein concentrate (0,3,6 and 9%) in diets. The parameters evaluated were: body weight gain, feed conversion ratio, consumption of ration, enzyme production in the pancreas, villus: crypt ratio, leukocyte count and immunoglobulin A (IgA) dosage. Aimed to determine the coefficient of nutrient metabolization of feeds, 144 male Cobb chicks were distributed, between 14 and 21 days of age, with four treatments and six replications of six birds per experimental unit. Treatments were the same as in the first experiment. The use of 3 and 9% of SPC did not affect weight gain, feed intake, feed conversion or viability of the poultry. The use of 6% of SPC provided an increase in trypsin activity, villi length and crypt depth; the coefficient of dry matter metabolization increased linearly; but no differences were observed in performance or immunological parameters.

Impact of feeding modified soy protein concentrate in the starter phase on growth performance and gastrointestinal responses in broiler chickens through to day 42 of age

“…The observed greater growth performance of birds fed MSPC in starter phase agreed with a recent evaluation of MSPC in broiler chickens ( Zhang et al, 2021 ). Although, conventional SPC was not incorporated in the present study, improved growth performance of MSPC birds could be linked to differences in antinutritional factors, CP solubility, and fibrous components relative to SBM or SPC samples used in previous studies ( Vasconcelos et al, 2017 ; Zakaria and Ata, 2020 ). The diets had no effects on liver, pancreas, spleen, and bursa weight, and pancreatic and intestinal digestive enzymes activities in 10-d old broiler chickens.…”

“…Application of exogenous feed enzymes has also been shown to improve amino acids and energy utilization in SBM products ( Ayoade et al, 2012 ; Woyengo et al, 2016 ; Kiarie et al, 2020 ). Application of SPC has been studied in feeding programs for the young animals with immature gastrointestinal tract ( Li et al, 1991 ; Batal and Parsons, 2003 ; Lenehan et al, 2007 ; NRC, 2012 ; Vasconcelos et al, 2017 ; Zakaria and Ata, 2020 ). However, growth performance in newly hatched chicks or pigs fed SPC has been variable.…”

“…Soy protein concentrate ( SPC ) is produced by aqueous ethanol extraction at temperatures greater than 50°C resulting in deactivation of allergenic proteins and removal of water-soluble carbohydrates ( Sissons et al, 1982 ). The SPC contains at least 65% crude protein and is well tolerated by animals with immature digestive tract ( Li et al, 1991 ; Batal and Parsons, 2003 ; Lenehan et al, 2007 ; NRC, 2012 ; Vasconcelos et al, 2017 ). Indeed, feeding SPC increased energy and amino acids utilization linked to enhanced pancreatic trypsin activity and indices of small intestine digestive function in broiler chickens ( Batal and Parsons, 2003 ; Vasconcelos et al, 2017 ).…”

“…The SPC contains at least 65% crude protein and is well tolerated by animals with immature digestive tract ( Li et al, 1991 ; Batal and Parsons, 2003 ; Lenehan et al, 2007 ; NRC, 2012 ; Vasconcelos et al, 2017 ). Indeed, feeding SPC increased energy and amino acids utilization linked to enhanced pancreatic trypsin activity and indices of small intestine digestive function in broiler chickens ( Batal and Parsons, 2003 ; Vasconcelos et al, 2017 ). In addition, further processed soy products have relatively low potassium concentration relative to SBM, an attribute that could impact litter quality ( Swiatkiewicz et al, 2017 ).…”

“…For example, inclusion of between 9.4 and 26% SPC in iso-nitrogenous and iso-caloric corn-SBM diet indicated that broiler fed the highest amount of SCP had lower feed intake and weight gain at the end of the 6 wk trial ( Leske et al, 1995 ). Incorporation of 3 to 9% SPC in prestarter and starter diets (d 0–21) had no impact on broiler chicken growth performance through to d 40 of age ( Vasconcelos et al, 2017 ). Broiler chickens were allocated 300 g feed for 12 d posthatch period; the control group was fed a corn-SBM diet and treated groups fed various amount (140, 160 and 180 g/bird) of a corn-SBM with 5% SPC diet ( Zakaria and Ata, 2020 ).…”