Document Type : Research Paper
Authors
1 Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj, Iran. E-mail: ali.heydari76@ut.ac.ir
2 Corresponding Author, Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj, Iran. E-mail: hmoraveg@ut.ac.ir
3 Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj, Iran. E-mail: Mohammad.latifi@ut.ac.ir
4 Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj, Iran. E-mail: zboroumandnia@ut.ac.ir
Abstract
Objective: The aim of this study was to compare the effect of diet formulated based on apparent metabolizable energy (AME), total amino acids (TAA) and standardized ileal digestible amino acids (SIDAA) on productive performance, carcass characteristics and economic efficiency of broiler chickens.
Method: Two hundred and fifty twoone-day-old female broiler chicks of Ross 308 strain were used in this experiment in a completely randomized design with 7 treatments with 6 replicates and 6 birds per replicate. The treatments included: 1. NRC 1994 tables based on TAA, 2 and 3. Prediction regression equations of NRC 1994 tables with NIR data and proximate analysis of nutrition laboratory based on TAA, 4 and 5. NIR data based on TAA and SIDAA, 6 and 7. Prediction regression equations of internal articles with proximate analysis data of nutrition laboratory based on TAA and SIDAA. The experimental diets were given to the birds from 1 to 45 days of age. Production performance traits, carcass characteristics and economic efficiency of birds of different experimental treatments was calculated.
Results: In the whole rearing period, the highest mean weight gain (respectively 2789, 2774 and 2695 grams) belonged to treatments 6, 7 and 3 and the lowest mean weight gain (respectively 2535 and 2472 grams) belonged to treatments 1 and 4 (P<0.05). The lowest feed conversion ratio (respectively 1.66, 1.67 and 1.68) in treatments 7, 6 and 5 was observed (P<0.05), but there was no significant difference between other treatments. In addition, in comparison of experimental treatments based on TAA and SIDAA, the highest relative breast muscle weight (respectively 37.0, 36.71 and 36.53 percent) significantly belonged to experimental treatments 3, 7 and 6 (P<0.05) and the lowest relative breast muscle weight (32.65 percent) belonged to experimental treatment 4 (P<0.05). Results of diet comparison adjusted for standardized ileal digestible amino acids and total amino acids indicated that diet formulation using standardized ileal digestible amino acids resulted in greater profit and economic efficiency in broiler chickens so that experimental treatment 7, compared to treatment 6, resulted in 101 additional Tomans profit per broiler, and that the percentage of profit was greatest for experimental treatment 7 and least for experimental treatment 4.
Conclusion: Regard the data drived from this research, it seems that the combination of prediction regression equations drived from national research, along with improvement of bird performance during the whole period and the increase of carcass characteristics, would maximaize feedstuffs consumption economic efficiency in production units and the use of them in diet formulation compared to tables and data from the NIR device.
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