APSS 2013 Proceedings - The University of Sydney

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Aust. Poult. Sci. Symp. 2013.....24 Emmans GC, Fisher C. 1986 In: Nutrient Requirements of Poultry and Nutritional Research (Fisher C, Boorman KN eds) pp.9 – 39, Butterworths, London. Fisher C, Wilson BJ (1974) In: Energy Requirements of Poultry (Morris TR, Freeman BM eds), pp. 151 – 184, British Poultry Science Ltd, Edinburgh. Fisher C, Gous RM, Goddard L (2001) Proceedings, Australian Poultry Science Symposium13, 183 – 186. Fraps GS (1943) Poultry Science 22, 421-424. Gous RM (2010) Proceedings, Australian Poultry Science Symposium 21, 36-43. Gous RM, Morris TR (1985) British Poultry Science 26, 147-161. Gous RM, Griessel M, Morris TR (1987) British Poultry Science 28, 427-436. Gous RM, Emmans GC, Broadbent LA, Fisher C (1990) British Poultry Science 31, 495-505. Gous RM, Emmans GC, Fisher C (2012) South African Journal of Animal Science 42, 63 – 73. Gous RM, Swatson HK (2000) British Poultry Science 41, 136 – 140. Harper AE, Benevenga NJ, Wohlheuter RM (1970) Physiological Reviews 50, 428-558. Jackson S, Summers JD, Leeson S (1982) Poultry Science 61, 2224-2228. Jensen LS, Merrill LH, Reddy CV, McGinnis J (1962) Poultry Science 41, 1414 – 1419. Kyriazakis I, Emmans GC (1991) Animal Production 52, 337-346. Kyriazakis I, Emmans GC (1995) British Journal of Nutrition74, 183-195. Leeson S, Caston L, Summers JD (1996) Poultry Science 75, 522-528. Lentle RG (2005) Australian Poultry Science Symposium 17, 163-170. Nonis MK (2007) Unpublished Ph D Thesis, University of KwaZulu-Natal. O’Neill SJB, Balnave D, Jackson N (1971) Journal of Agricultural Science 7, 293-305. Park B-C (2006) Asian-Australian Journal of Animal Science 19, 1361 – 1368. Rinehart K (1981) Poultry Digest, 31 – 33, June Sakomura NK (2004) Brazilian Journal of Poultry Science 6, 1 – 11. Seaton KW, Thomas OP, Gous RM, Bossard EH (1978) Poultry Science 57, 692-693. 106
Aust. Poult. Sci. Symp. 2013.....24 RESPONSE OF BROILER CHICKENS TO DIETARY ENERGY AND ITS RELATIONSHIP TO AMINO ACID NUTRITION H.L. CLASSEN 1 Summary The relationship between dietary energy and amino acids is fundamental to the formulation of broiler diets. A historical perspective on this relationship is that broilers alter their feed intake to match dietary energy and therefore amino acid supplementation should be adjusted in accordance. However, control of feed intake is complex and even if this perspective is correct, multiple factors can prevent the appropriate adjustment in feed intake. Furthermore, the validity of broilers altering feed intake in response to dietary energy has been questioned and our research supports this view. Dietary energy did not affect feed intake when factors that confound broiler response were minimized, and reduced performance in low energy diets suggested that energy was insufficient to support the utilization of dietary amino acids. The results support approaches to feed formulation that ensure adequate dietary energy to maximize the protein accretion potential of the diet. I. INTRODUCTION Dietary energy and amino acids are the largest components of poultry diets and also the most expensive. Therefore understanding the relationship between these dietary components is of major significance. An important part of this relationship is the importance of these nutrients in controlling feed intake. Nutrition is one of many factors that control feed intake and it is beyond the scope of this paper to discuss this complex topic in its entirety (Ferket and Gernat, 2006; Applegate, 2012). Instead, the focus of the paper will be on the nature of diet energy effects on feed intake with specific reference to factors that may affect or camouflage the effects of energy per se. II. HISTORIC PERSPECTIVES The response of growing chickens to dietary energy has been the subject of much research and early research has been thoroughly reviewed (e.g. Fisher and Wilson, 1974; Pesti and Smith, 1984; Leclercq, 1986). These reviews provide a historical perspective and undoubtedly have shaped nutritional practice. A commonly accepted role of diet energy is shown in the following quote written in the beginning of the review by Fisher and Wilson (1974): “The primary response to dietary energy concentration is seen in feed consumption and in productive efficiency rather than in production level” This statement implies that within a reasonable range of dietary energy, feed intake responds to diet energy to maintain a constant nutrient intake, which in turn affects production efficiency. Fischer and Wilson (1974) outlined this response by examining much of the existing literature (160 comparisons) based on publications where ingredients were known and of a practical nature, data were available on growth and feed consumption, and the number of energy levels permitted the use of regression analysis. In experiments meeting these requirements, feed intake was shown to go down with increasing energy, but statistical 1 Department of Animal and Poultry Science, University of Saskatchewan. hank.classen@usask.ca 107
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CONTENTS THE IMPORTANCE OF THE POUL
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SHORT COMMUNICATION SESSION # 1: (c
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HOT TOPIC 2: EMERGING DISEASES AND
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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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