The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment
Objective: This experiment was conducted to investigate the effects of dietary crude protein (CP) level and exogenous protease supplementation on growth performance, serum metabolites, carcass traits, small intestinal morphology and endogenous protease activity in broiler chickens reared under a tro...
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| Format: | Article |
| Language: | English |
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Asian-Australasian Association of Animal Production Societies
2018
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| Online Access: | http://psasir.upm.edu.my/id/eprint/14084/ http://psasir.upm.edu.my/id/eprint/14084/1/The%20effects%20of%20low-protein%20diets%20and%20protease%20supplementation%20on%20broiler%20chickens%20in%20a%20hot%20and%20humid%20tropical%20environment.pdf |
| _version_ | 1848842295406755840 |
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| author | Law, Fang Lin Idrus, Zulkifli Farjam, Abdoreza Soleimani Liang, Juan Boo Mohamed, Elmutaz Atta Awad |
| author_facet | Law, Fang Lin Idrus, Zulkifli Farjam, Abdoreza Soleimani Liang, Juan Boo Mohamed, Elmutaz Atta Awad |
| author_sort | Law, Fang Lin |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Objective: This experiment was conducted to investigate the effects of dietary crude protein (CP) level and exogenous protease supplementation on growth performance, serum metabolites, carcass traits, small intestinal morphology and endogenous protease activity in broiler chickens reared under a tropical climate.
Methods: A total of 480 day-old male broiler chicks were randomly assigned to eight dietary treatments in a 4×2 factorial arrangement. The main effects were CP level (21.0%, 19.7%, 18.5%, or 17.2% from 1 to 21 days and 19.0%, 17.9%, 16.7%, or 15.6% from 22 to 35 days) and protease enzyme supplementation (0 ppm or 500 ppm). All experimental diets were fortified with synthetic feed-grade lysine, methionine, threonine and tryptophan to provide the minimum amino acid recommended levels for Cobb 500.
Results: Reducing dietary CP linearly reduced (p<0.05) growth performance, serum albumin, total protein, and carcass traits and increased (p<0.05) serum triglycerides and abdominal fat. There was no consistent effect of reducing dietary CP on morphological parameters of the intestine and on the pancreatic and intestinal endogenous protease activity (p>0.05). Protease supplementation improved (p<0.05) feed conversion ratio, body weight gain, carcass yield and intestinal absorptive surface area.
Conclusion: Protease supplementation, as measured by growth performance, intestinal morphology and carcass yield, may alleviate the detrimental effects of low protein diets in broiler chickens. |
| first_indexed | 2025-11-15T07:56:52Z |
| format | Article |
| id | upm-14084 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T07:56:52Z |
| publishDate | 2018 |
| publisher | Asian-Australasian Association of Animal Production Societies |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-140842018-09-04T08:09:15Z http://psasir.upm.edu.my/id/eprint/14084/ The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment Law, Fang Lin Idrus, Zulkifli Farjam, Abdoreza Soleimani Liang, Juan Boo Mohamed, Elmutaz Atta Awad Objective: This experiment was conducted to investigate the effects of dietary crude protein (CP) level and exogenous protease supplementation on growth performance, serum metabolites, carcass traits, small intestinal morphology and endogenous protease activity in broiler chickens reared under a tropical climate. Methods: A total of 480 day-old male broiler chicks were randomly assigned to eight dietary treatments in a 4×2 factorial arrangement. The main effects were CP level (21.0%, 19.7%, 18.5%, or 17.2% from 1 to 21 days and 19.0%, 17.9%, 16.7%, or 15.6% from 22 to 35 days) and protease enzyme supplementation (0 ppm or 500 ppm). All experimental diets were fortified with synthetic feed-grade lysine, methionine, threonine and tryptophan to provide the minimum amino acid recommended levels for Cobb 500. Results: Reducing dietary CP linearly reduced (p<0.05) growth performance, serum albumin, total protein, and carcass traits and increased (p<0.05) serum triglycerides and abdominal fat. There was no consistent effect of reducing dietary CP on morphological parameters of the intestine and on the pancreatic and intestinal endogenous protease activity (p>0.05). Protease supplementation improved (p<0.05) feed conversion ratio, body weight gain, carcass yield and intestinal absorptive surface area. Conclusion: Protease supplementation, as measured by growth performance, intestinal morphology and carcass yield, may alleviate the detrimental effects of low protein diets in broiler chickens. Asian-Australasian Association of Animal Production Societies 2018 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/14084/1/The%20effects%20of%20low-protein%20diets%20and%20protease%20supplementation%20on%20broiler%20chickens%20in%20a%20hot%20and%20humid%20tropical%20environment.pdf Law, Fang Lin and Idrus, Zulkifli and Farjam, Abdoreza Soleimani and Liang, Juan Boo and Mohamed, Elmutaz Atta Awad (2018) The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment. Asian-Australasian Journal of Animal Sciences, 31 (8). pp. 1291-1300. ISSN 1011-2367; ESSN: 1976-5517 https://www.ajas.info/journal/view.php?number=23882 10.5713/ajas.17.0581 |
| spellingShingle | Law, Fang Lin Idrus, Zulkifli Farjam, Abdoreza Soleimani Liang, Juan Boo Mohamed, Elmutaz Atta Awad The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment |
| title | The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment |
| title_full | The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment |
| title_fullStr | The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment |
| title_full_unstemmed | The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment |
| title_short | The effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment |
| title_sort | effects of low-protein diets and protease supplementation on broiler chickens in a hot and humid tropical environment |
| url | http://psasir.upm.edu.my/id/eprint/14084/ http://psasir.upm.edu.my/id/eprint/14084/ http://psasir.upm.edu.my/id/eprint/14084/ http://psasir.upm.edu.my/id/eprint/14084/1/The%20effects%20of%20low-protein%20diets%20and%20protease%20supplementation%20on%20broiler%20chickens%20in%20a%20hot%20and%20humid%20tropical%20environment.pdf |