Influence of exogenous acid protease in broiler chickens fed corn–soybean meal‐based diets

Abstract

This study was conducted to determine the influence of exogenous acid protease (EAP) on growth performance, blood profiles, excreta noxious gas emissions, ileum digesta viscosity and apparent ileal digestibility in broilers. A total of 600 1-d-old broilers with average initial body weight of 47.0 ± 0.2 g were used in a 5-week feeding trial. The broilers were randomly allotted to 1 of 4 treatments with 10 replicate pens per treatment and 15 birds per cage. Dietary treatments consisted of: CON, basal diets; EAP1, CON + 2,700 exogenous acid protease unite (APU)/kg; EAP2, CON + 5,400 APU/kg; EAP3, CON + 8,100 APU/kg. The body weight gain (BWG) had a linear improvement when chicks fed 8,100 AP/kg diets from d 18 to 35 and overall (p < .05). Lower feed conversion ratio (FCR) was obtained in broilers fed 5,400 APU/kg and 8,100 APU/kg as compared with the CON during overall (p < .05). Birds fed diets supplemented with EAP diet led to a linear increase in the ileal digestibility of crude protein, energy and amino acids (lysine, methionine, cystine, threonine, isoleucine, leucine, histidine and tryptophan) compared with CON group (p < .05). In conclusion, based on our results, we suggest that supplementation with EAP diet was effective in improving growth performance through increasing ileal digestibility of some nutrients (crude protein, energy and amino acids) in broilers. K E Y W O R D Sacid protease, blood, broiler, growth, ileal digestibility

Impact of Microbial Protease Enzyme and Dietary Crude Protein Levels on Growth and Nutrients Digestibility in Broilers over 15–28 Days

“…Means in the same column with different superscripts differ significantly (p < 0.05). 1 Diets contained different levels of CP: CP-1 = 17% CP; CP-2 = 19% CP; CP-3 = 21% CP (all these diets were with or without protease enzyme). 2 Protease enzyme at 30,000 UI/kg.…”

“…The inclusion of exogenous protease may be an effective nutritional tool to improve growth and increase digestibility of crude protein and metabolizable energy in broiler diet [ 1 ]. Endogenous enzymes are secreted in animal body, but their concentration is not always sufficient for efficient protein digestion [ 2 ], especially during the growing phase, where feed intake substantially increases.…”

Nutrición animal: Texto de formación universitaria

“…Las proteasas endógenas del animal tienen limitada eficacia en la digestión de las proteínas, por lo que la tecnología ha desarrollado proteasas exógenas comerciales para ayudar en la digestión. Los trabajos previos evidenciaron que la inclusión de proteasas exógenas en la dieta puede ser una herramienta nutricional eficaz para mejorar la digestibilidad de la proteína cruda (PC), la energía metabolizable en la dieta y el crecimiento del pollo de engorde (Hu et al, 2020). A partir de esa base, Jabbar et al (2021) alimentaron pollos parrilleros con dietas de diferentes niveles de PC y proteasa exógena.…”

Effect Using Feed Additives Instead of Imported Premixes Affects the Physiology of Broiler Chickens

“…However, the poultry industry faces a major challenge in the form of high feed costs. Approximately 70-80% of the total cost of poultry production is allocated to feed expenses [2]. In order to address this issue, there is a need to find new ways to enhance the availability of essential nutrients in poultry feed while reducing costs.…”