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Abstract
ABSTRACT An experimental study was conducted to examine the effects of adding serine-protease from Bacillus licheniformis on performance and physiological parameters of broiler chickens under Egyptian condition. A total of 600 one-day-old chicks were randomly divided into four experimental treatments. The treatments consisted of the control diet with 0, 100, 200 and 300 mg/kg serine-protease. Protease supplementation increased (P < 0.05) body weights (BW). Feed conversion ratio (FCR) was improved (P < 0.05) due to 200 and 300 mg/kg protease supplementation. The dry matter and crude protein digestibilities were enhanced (P < 0.05) by both 200 and 300 mg/kg protease supplementation. Plasma albumin and high-density lipoprotein (HDL) concentrations were increased (P < 0.05), while plasma total cholesterol (CHO) and low-density lipoprotein (LDL) concentrations were decreased (P < 0.05) at 100, 200, and 300 mg/kg of protease. Liver malondialdehyde (MDA) levels were declined (P < 0.05) due to 200 and 300 mg /kg protease supplementation. Supplementing 100, 200, and 300 mg/kg of protease increased (P < 0.05) lysine, methionine, and threonine levels in breast muscle. In conclusion, exogenous serine-protease could be used as a feed additive in broiler nutrition and supplementing 200∼300 mg/kg was sufficient to improve growth performance, probably because of its mechanism to enhance protein digestibility.
Highlights
Protein is one of the most nutrients and the most expensive component of animal diets
Supplemental exogenous enzymes could optimize the digestibility of crude protein (CP) and growth performance of broiler chickens (Jiang et al 2008; Angel et al 2011; Kalmendal and Tauson 2012; Yegani and Korver 2013; Saleh et al 2019a)
Dietary protease supplementation at any level increased (P < 0.05) the final body weights of broiler chickens compared to the non-supplemented chickens (Table 2)
Summary
Protein is one of the most nutrients and the most expensive component of animal diets. The physiological function of proteases is necessary for all living organisms, and proteolytic enzymes can be classified based on their origin: microbial (bacterial, fungal, and viral). The endogenous intestinal proteases are sufficient to improve protein utilization (Le Heurou-Luron et al 1993; Niban and Mahgna 1993; Baghban-Kanani et al 2018). Digestibility of crude protein (CP) and amino acid is not completed in all animals (Wang and Parsons 1998; Lemme et al 2004). It has been reported that activities of digestive enzymes (lipase, amylase, and trypsin) increase with age (Noy and Sklan 1979; Nitsan et al 1991; Jin et al 1998). Supplemental exogenous enzymes could optimize the digestibility of CP and growth performance (body weight gain and feed conversion ratio) of broiler chickens (Jiang et al 2008; Angel et al 2011; Kalmendal and Tauson 2012; Yegani and Korver 2013; Saleh et al 2019a)
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