APSS 2013 Proceedings - The University of Sydney

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Aust. Poult. Sci. Symp. 2013.....24 experiment, enzyme supplementation of reformulated wheat- and soybean meal-based diets was able to compensate for growth depression. These results are in agreement with previous results (Bedford and Classen, 1992). In addition, the present study emphasizes the impact of nutrient density on enzyme efficiency and the requirement for precise feed formulation values. Surprisingly, the enzyme effect was not linear. In other words, an increase in diet nutritional value through enzyme addition will not result in similar performance improvement. A similar study designed for evaluation of enzyme on graded density diets (Bedford and Classen, 1992), also showed that response to enzyme supplementation differed depending on the energy level in wheat and rye diets. Indeed, Bedford and Classen (1992) obtained a maximum FCR improvement for a low density diet (11.80 MJ ME/kg) compared with high density diet (12.85 MJ ME/kg) with about 31.9 and 9.6 % FCR improvement relative to control from 0 to 19 d of age, respectively. In contrast to our work, they observed a continuous improvement in FCR when enzyme was added with decreasing energy level of the diet (- 1.05 MJ ME/kg). The large improvement observed in this study was probably related to the formulation strategy, using a substitution of wheat by rye instead of least cost formulation, resulting in lower range of energy variation than in our study (1.05 MJ ME vs. 3.35 MJ AMEn). REFERENCES Bedford MR, Classen, HL (1992). Journal of Nutrition 122, 560-569. Cowieson AJ, Hruby M, Pierson EEM (2006). Nutrition Research Review 19, 90-103. Quiniou N, Noblet J (2012) Journal of Animal Science doi.10.2527. Leeson S, Summers JD, (1991) University Books, Guelph, Canada. Leeson S, Caston L, Summer JD (1996). Poultry Science 75, 529-535. Table 1 - Composition and calculated nutrient content of basal diets Grower Finisher Low High Low High Composition, g/kg Wheat 402 414 365 472 Wheat bran 470 - 566 - Soybean meal 83 400 30 350 Vegetable oil - 144 - 138 DL-methionine 2 4 1 1 HCl-lysine 5 2 3 5 L-threonine 2 1 1 - Calcium carbonate 11 9 11 9 Dicalcium phosphate 15 15 13 14 Salt 5 5 5 5 Premix 1 6 6 6 6 Nutrients content, g/kg Crude protein 173.9 231.9 159.8 205.2 AMEn 2 , MJ/kg 10.03 13.38 10.03 13.38 Digestible lysine 9.5 12.7 7.3 .9.7 1 Providing per kg of feed: vitamin A = 12 000 IU, vitamin D 3 = 3 000 IU, vitamin E = 100 IU, vitamin K 3 = 3 mg, vitamin B 1 = 2 mg, vitamin B 2 = 8 mg, vitamin B 6 = 3 mg, vitamin B 12 = 0.02 mg, folic acid = 1 mg, biotin = 0.2 mg, pantothenic acid = 15 mg, nicotinic acid = 40 mg, Mn = 80 mg, Zn = 60 mg, I = 1 mg, Fe = 80 mg, Cu = 15 mg, Co = 0.4 mg, Se = 0.2 mg, Ethoxyquin = 0.5 mg, BHA = 0.5 mg and Narasin/nicarbazine = 80 mg. 2 Apparent metabolisable energy standardized for zero nitrogen retention (AMEn) were calculated from raw material value measurements without enzyme. 70
Aust. Poult. Sci. Symp. 2013.....24 Table 2 - Effect of dietary nutrient density and enzyme supplementation on the performance of broilers (0 to 35 d) Low Medium 1 Medium 2 High Statistic 1 - + - + - + - + diet enzyme inter R² RSD Body weight, g Initial 40 40 40 40 40 40 40 40 1.000 1.000 1.000 0.08 2 21 day 716 d 728 d 840 c 841 c 896 b 908 b 907 b 948 a
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24 th ANNUAL AUSTRALIAN POULTRY SCI
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AUSTRALIAN POULTRY SCIENCE SYMPOSIU
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AUSTRALIAN POULTRY AWARD The Austra
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CONTENTS THE IMPORTANCE OF THE POUL
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SHORT COMMUNICATION SESSION # 1: (c
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SHORT COMMUNICATION SESSTION # 2: (
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HOT TOPIC 2: EMERGING DISEASES AND
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Aust. Poult. Sci. Symp. 2013.....24
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INTERACTIVE EFFECTS OF EXOGENOUS EN
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microbiota to favor an increased ac
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AUTHOR INDEX Name Page(s) Email Add
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Klein-Hessling, H 207 hkleinhesslin
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Van de Wouw, A 247 nnet.vandewouw@w
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