Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets
Problem statement: Supplementation of broiler diets with cristalline amino acids (i.e. lysine, ethionine and threonine) may support equal broiler growth and improve overall amino acids balance and enable a reduction in CP level of diets. Approach: A trial was conducted to evaluate the effect of supp...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Science Publications
2009
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| Online Access: | http://psasir.upm.edu.my/id/eprint/14265/1/ajavsp.2009.95.100.pdf |
| _version_ | 1796968609623310336 |
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| author | Edi Erwan, Alimon, Abdul Razak Sazili, Awis Qurni Yaakub, Halimatun Abdullah, Muhammad Hilmi |
| author_facet | Edi Erwan, Alimon, Abdul Razak Sazili, Awis Qurni Yaakub, Halimatun Abdullah, Muhammad Hilmi |
| author_sort | Edi Erwan, |
| collection | UPM |
| description | Problem statement: Supplementation of broiler diets with cristalline amino acids (i.e. lysine, ethionine and threonine) may support equal broiler growth and improve overall amino acids balance and enable a reduction in CP level of diets. Approach: A trial was conducted to evaluate the effect of supplemental L-leucine in diets containing recommended levels and low crude protein (20 and 18%, respectively) with constant metabolizable energy (3200 kcal kg-1) for broilers from 21- 42 day of age. Six experimental diets were formulated with three levels of supplemental L-leucine, 0, 0.5 and 0.67% and two levels of crude protein. A total of 180 1 day-old Cobb broiler chickens were randomly divided into 36 experimental pens, 5 chickens in each pen, with each diet replicated 6 times. The dietary treatments were offered from 21-42 days of age. Feed intake, body weight gain and Feed Conversion Ratio (FCR) were measured on a weekly basis. At the end of the feeding trial the birds were slaughtered and carcass analyses conducted. Results: Feed intake, weight gain and FCR were not affected by increasing levels of L-leucine supplementation. Weight gain was significantly reduced (p<0.05), whereas feed intake and FCR were not significantly affected with decreasing dietary crude protein. A positive response in breast meat yield was achieved by the addition of L-leucine to levels up to 0.5% in the diet but a significant decrease was noted when the level reached 0.67% in diet. Supplementation of L-leucine significantly (p<0.05) decreased the relative weights of the liver and gizzard. However, the addition of L-leucine significantly reduced carcass weights when L-leucine was added at 0.67%. Lowering the dietary protein level also significantly reduced breast yield and carcass weight (p<0.05). However, abdominal fat, gizzard, liver and heart were not affected by protein level. Conclusion/Recommendations: It can be concluded that supplementation of L-leucine at levels up to 0.67% of the diet did not affect performance but deleteratious the carcass weight. |
| first_indexed | 2024-03-06T07:30:52Z |
| format | Article |
| id | upm.eprints-14265 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T07:30:52Z |
| publishDate | 2009 |
| publisher | Science Publications |
| record_format | dspace |
| spelling | upm.eprints-142652017-11-22T07:58:04Z http://psasir.upm.edu.my/id/eprint/14265/ Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets Edi Erwan, Alimon, Abdul Razak Sazili, Awis Qurni Yaakub, Halimatun Abdullah, Muhammad Hilmi Problem statement: Supplementation of broiler diets with cristalline amino acids (i.e. lysine, ethionine and threonine) may support equal broiler growth and improve overall amino acids balance and enable a reduction in CP level of diets. Approach: A trial was conducted to evaluate the effect of supplemental L-leucine in diets containing recommended levels and low crude protein (20 and 18%, respectively) with constant metabolizable energy (3200 kcal kg-1) for broilers from 21- 42 day of age. Six experimental diets were formulated with three levels of supplemental L-leucine, 0, 0.5 and 0.67% and two levels of crude protein. A total of 180 1 day-old Cobb broiler chickens were randomly divided into 36 experimental pens, 5 chickens in each pen, with each diet replicated 6 times. The dietary treatments were offered from 21-42 days of age. Feed intake, body weight gain and Feed Conversion Ratio (FCR) were measured on a weekly basis. At the end of the feeding trial the birds were slaughtered and carcass analyses conducted. Results: Feed intake, weight gain and FCR were not affected by increasing levels of L-leucine supplementation. Weight gain was significantly reduced (p<0.05), whereas feed intake and FCR were not significantly affected with decreasing dietary crude protein. A positive response in breast meat yield was achieved by the addition of L-leucine to levels up to 0.5% in the diet but a significant decrease was noted when the level reached 0.67% in diet. Supplementation of L-leucine significantly (p<0.05) decreased the relative weights of the liver and gizzard. However, the addition of L-leucine significantly reduced carcass weights when L-leucine was added at 0.67%. Lowering the dietary protein level also significantly reduced breast yield and carcass weight (p<0.05). However, abdominal fat, gizzard, liver and heart were not affected by protein level. Conclusion/Recommendations: It can be concluded that supplementation of L-leucine at levels up to 0.67% of the diet did not affect performance but deleteratious the carcass weight. Science Publications 2009 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/14265/1/ajavsp.2009.95.100.pdf Edi Erwan, and Alimon, Abdul Razak and Sazili, Awis Qurni and Yaakub, Halimatun and Abdullah, Muhammad Hilmi (2009) Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets. American Journal of Animal and Veterinary Sciences, 4 (4). pp. 95-100. ISSN 1557-4555; ESSN: 1557-4563 http://thescipub.com/html/10.3844/ajavsp.2009.95.100 10.3844/ajavsp.2009.95.100 |
| spellingShingle | Edi Erwan, Alimon, Abdul Razak Sazili, Awis Qurni Yaakub, Halimatun Abdullah, Muhammad Hilmi Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets |
| title | Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets |
| title_full | Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets |
| title_fullStr | Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets |
| title_full_unstemmed | Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets |
| title_short | Effect of L-leucine supplementation on growth performance and carcass characteristics of grower-broiler chickens fed low protein diets |
| title_sort | effect of l leucine supplementation on growth performance and carcass characteristics of grower broiler chickens fed low protein diets |
| url | http://psasir.upm.edu.my/id/eprint/14265/1/ajavsp.2009.95.100.pdf |
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