{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T18:31:56Z","timestamp":1791829916324,"version":"4.3.4"},"reference-count":34,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2022,7,18]],"date-time":"2022-07-18T00:00:00Z","timestamp":1658102400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Vet. Sci."],"abstract":"<jats:p>The aim of this study was to investigate the responses of non-starch polysaccharide (NSP) enzymes and protease combination on growth performance, meat quality, and nutrients digestibility of yellow-feathered broilers fed with corn-soybean meal basal diets with normal and subnormal crude protein (CP) levels. The experimental design was completely randomized with a 2 \u00d7 2 factorial arrangement of treatments, including six replicates of 20 birds per pen. Two basal diets were formulated with normal CP level as positive control (PC) and subnormal CP level without extra essential amino acid (AA) supplementation as negative control (NC). The basal diets were supplemented without or with NSP enzymes and protease. Broilers fed with the NC diet had lower (<jats:italic>P<\/jats:italic> &amp;lt; 0.05) final body weight (BW), average daily weight gain (ADG) on days 1\u201321, 22\u201356 and 1\u201356 and higher (<jats:italic>P<\/jats:italic> &amp;lt; 0.05) feed-to-gain ratio (F\/G) on day 22\u201356 than those fed with PC diet. The broilers fed with the NC diet had higher (<jats:italic>P<\/jats:italic> &amp;lt; 0.05) L<jats:sup>*<\/jats:sup> and b<jats:sup>*<\/jats:sup> values in thigh muscle, crypt depth in the duodenum, and dry matter (DM) digestibility as well as lower (<jats:italic>P<\/jats:italic> &amp;lt; 0.05) villus height, musculature thicknesses, and villus height: crypt depth in the duodenum than those fed with the PC diet. Dietary NSP enzymes and protease combination increased (<jats:italic>P<\/jats:italic> &amp;lt; 0.05) the ADG and F\/G of the broilers on days 1\u201356, and pH values in breast and thigh muscles as well as the digestibility of DM, gross energy (GE), CP and most AAs of the broilers on day 56. Compared with the PC diet, the combination of NSP enzymes and protease exhibited greater (<jats:italic>P<\/jats:italic> &amp;lt; 0.05) improvements in the digestibility of DM, CP, and some AAs (Asp, Ile, and Leu) in the broilers fed with the NC diet. In conclusion, reducing CP diet without essential AA supplementation impaired the growth performance and meat color of the thigh muscles of the broilers. The combination of NSP enzymes and protease effectively improved the growth performance, meat quality, and nutritional values of the broilers. In terms of the digestibility of DM, CP, and some AAs, the magnitude of response to the addition of NSP enzymes and protease was greater in the low nutritional-quality diet with a subnormal CP level.<\/jats:p>","DOI":"10.3389\/fvets.2022.946204","type":"journal-article","created":{"date-parts":[[2022,7,18]],"date-time":"2022-07-18T06:21:46Z","timestamp":1658125306000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["Responses of Combined Non-starch Polysaccharide Enzymes and Protease on Growth Performance, Meat Quality, and Nutrient Digestibility of Yellow-Feathered Broilers Fed With Diets With Different Crude Protein Levels"],"prefix":"10.3389","volume":"9","author":[{"given":"Chaoyong","family":"Wang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Yuan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Yang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenxuan","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qilin","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaixuan","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiangyu","family":"Mou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lizhi","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kangkang","family":"Nie","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinyun","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongwen","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2022,7,18]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"90","DOI":"10.1079\/NRR2006121","article-title":"Evolving enzyme technology: impact on commercial poultry nutrition","volume":"19","author":"Cowieson","year":"2006","journal-title":"Nutr Res Rev"},{"key":"B2","first-page":"157","article-title":"The role of exogenous enzymes in promoting growth and improving nutrient digestibility in poultry","volume":"19","author":"Alagawany","year":"2018","journal-title":"Iran J Vet Res"},{"key":"B3","doi-asserted-by":"publisher","first-page":"277","DOI":"10.1017\/S0043933918000272","article-title":"The use of NSP enzymes in poultry nutrition: myths and realities","volume":"74","author":"Aftab","year":"2018","journal-title":"World Poultry Sci J"},{"key":"B4","doi-asserted-by":"publisher","first-page":"363","DOI":"10.1016\/0377-8401(94)90038-8","article-title":"The nutritive value of barley, rye, wheat and corn for young chicks as affected by use of a Trichoderma reesei enzyme preparation","volume":"45","author":"Marquardt","year":"1994","journal-title":"Anim Feed Sci Tech"},{"key":"B5","doi-asserted-by":"publisher","first-page":"290","DOI":"10.5713\/ajas.2013.13261","article-title":"Multicarbohydrase enzymes for non-ruminants","volume":"27","author":"Masey O'Neill","year":"2014","journal-title":"Asian Austral J Anim"},{"key":"B6","doi-asserted-by":"publisher","first-page":"1242","DOI":"10.1093\/ps\/84.8.1242","article-title":"Nutritive values of corn, soybean meal, canola meal, and peas for broiler chickens as affected by a multicarbohydrase preparation of cell wall degrading enzymes","volume":"84","author":"Meng","year":"2005","journal-title":"Poult Sci"},{"key":"B7","doi-asserted-by":"publisher","first-page":"2501","DOI":"10.3382\/ps.2013-03789","article-title":"Ravindran, V. 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