Ch. Ahsan Akram (2009-VA-397)
Impact Of Digestible Lysine, Methionine + Cysteine Ratios On Growth Performance, Ileal Digestibility Of Protein And Gut Health In Broilers Fed Different Protein Sources - 2016. - 51p.;
Poultry production is a vibrant segment of agriculture in Pakistan. Genetic selection and nutritional improvements resulted in accelerated growth rate and better FCR in modern broilers. This improved broiler performance requires greater amount of digestible nutrients. Since feeding cost accounts about 70% of total production cost and protein is the most expensive component of poultry diets. Future poultry diets, therefore, will be formulated by using cheaper and poorly digestible protein sources such as CM and SFM due to price volatility of highly digestible but expensive sources like SBM. The undigested protein in hind gut is subjected to microbial fermentation, results in formation of nitrogenous products that are not only harmful to birds, but also excreted into litter bedding and generate ammonia, nitrous acid and nitrous oxide, the latter one is a powerful greenhouse gas with an effect about 300 times compared with carbon dioxide. The potential solution to this problem is supplementation of synthetic amino acids in low nutrient density (CP) diets formulated by using cheaper and poorly digestible protein sources. Therefor a study was designed with the objectives to determine the impact of dLys, M + C ratios on growth performance, apparent Ileal digestibility of protein and gut health in broilers fed poorly digestible protein sources (CM and SFM). An experiment with 432 mixed sex (Ross 308) 1-d-old broilers was conducted to test the hypothesis that supplementation of Meth may improves growth performance, apparent Ileal digestibility of protein and gut health in broilers fed poorly digestible protein sources (CM and SFM). The interaction effects of the protein source (CM vs. SFM), CP levels (high vs. low) and dM+C/d Lys (recommended vs. supplemented) were tested in a factorial arrangement of 8 (2 × 2 × 2) dietary treatments. The supplementation of Meth positively influenced FI (P = 0.042), BWG (P = 0.003) and FCR (P <0.001). The broilers fed Meth supplemented diets had, on an average, 10% greater apparent Ileal digestibility of protein, 34% longer villi, 24.5% shorter crypts and 60% greater VCR compared with those fed diets with recommended levels of Meth. The levels of CP, similarly, influenced (P <0.001) the FI, BWG and FCR. The broilers fed high CP diets had 9% improved apparent Ileal digestibility of protein compared with those fed low CP diets. In conclusion, supplementation of Meth improves the broiler growth performance, apparent Ileal digestibility of protein and gut health fed poorly digestible protein sources (CM and SFM). The negative effects of poorly digestible protein sources thus may be partially ameliorated by supplementation of Meth.
CONCLUSIONS
In conclusion, the negative effects of poorly digestible protein sources thus may be ameliorated by supplementation of Meth. Supplementation of Meth above the recommended levels improves the growth performance, Ileal digestibility of protein and gut health in broilers fed poorly digestible protein sources (CM and SFM).
SUGGESTION AND RECOMMENDATION
Further research is needed to evaluate the different strategies to improve the digestibility of poorly digestible protein sources including guar meal. Threonine also has an important role in gut health so there is a need to study the effects of supplementation of threonine above the recommended levels in broilers fed poorly digestible protein sources. Feed form has pronounced effects on gut development, digestibility of nutrients and subsequent growth performance of birds. There is a dire need to evaluate the other cheaper protein sources, supplemented with synthetic amino acids and to find out a possible interaction between feed form and poorly digestible protein sources that may replace SBM in broilers.
Department of Animal Nutrition
2567-T
Impact Of Digestible Lysine, Methionine + Cysteine Ratios On Growth Performance, Ileal Digestibility Of Protein And Gut Health In Broilers Fed Different Protein Sources - 2016. - 51p.;
Poultry production is a vibrant segment of agriculture in Pakistan. Genetic selection and nutritional improvements resulted in accelerated growth rate and better FCR in modern broilers. This improved broiler performance requires greater amount of digestible nutrients. Since feeding cost accounts about 70% of total production cost and protein is the most expensive component of poultry diets. Future poultry diets, therefore, will be formulated by using cheaper and poorly digestible protein sources such as CM and SFM due to price volatility of highly digestible but expensive sources like SBM. The undigested protein in hind gut is subjected to microbial fermentation, results in formation of nitrogenous products that are not only harmful to birds, but also excreted into litter bedding and generate ammonia, nitrous acid and nitrous oxide, the latter one is a powerful greenhouse gas with an effect about 300 times compared with carbon dioxide. The potential solution to this problem is supplementation of synthetic amino acids in low nutrient density (CP) diets formulated by using cheaper and poorly digestible protein sources. Therefor a study was designed with the objectives to determine the impact of dLys, M + C ratios on growth performance, apparent Ileal digestibility of protein and gut health in broilers fed poorly digestible protein sources (CM and SFM). An experiment with 432 mixed sex (Ross 308) 1-d-old broilers was conducted to test the hypothesis that supplementation of Meth may improves growth performance, apparent Ileal digestibility of protein and gut health in broilers fed poorly digestible protein sources (CM and SFM). The interaction effects of the protein source (CM vs. SFM), CP levels (high vs. low) and dM+C/d Lys (recommended vs. supplemented) were tested in a factorial arrangement of 8 (2 × 2 × 2) dietary treatments. The supplementation of Meth positively influenced FI (P = 0.042), BWG (P = 0.003) and FCR (P <0.001). The broilers fed Meth supplemented diets had, on an average, 10% greater apparent Ileal digestibility of protein, 34% longer villi, 24.5% shorter crypts and 60% greater VCR compared with those fed diets with recommended levels of Meth. The levels of CP, similarly, influenced (P <0.001) the FI, BWG and FCR. The broilers fed high CP diets had 9% improved apparent Ileal digestibility of protein compared with those fed low CP diets. In conclusion, supplementation of Meth improves the broiler growth performance, apparent Ileal digestibility of protein and gut health fed poorly digestible protein sources (CM and SFM). The negative effects of poorly digestible protein sources thus may be partially ameliorated by supplementation of Meth.
CONCLUSIONS
In conclusion, the negative effects of poorly digestible protein sources thus may be ameliorated by supplementation of Meth. Supplementation of Meth above the recommended levels improves the growth performance, Ileal digestibility of protein and gut health in broilers fed poorly digestible protein sources (CM and SFM).
SUGGESTION AND RECOMMENDATION
Further research is needed to evaluate the different strategies to improve the digestibility of poorly digestible protein sources including guar meal. Threonine also has an important role in gut health so there is a need to study the effects of supplementation of threonine above the recommended levels in broilers fed poorly digestible protein sources. Feed form has pronounced effects on gut development, digestibility of nutrients and subsequent growth performance of birds. There is a dire need to evaluate the other cheaper protein sources, supplemented with synthetic amino acids and to find out a possible interaction between feed form and poorly digestible protein sources that may replace SBM in broilers.
Department of Animal Nutrition
2567-T