Reply to Sibbald and Wolynetz

Hartel, H.

doi:10.1080/00071668708417018

Cited by 4 publications

(2 citation statements)

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“…Hartel (1986) concluded that in continuously fed birds the AME and TME values of a foodstuff are the same. Correspondence in British Poultry Science between Sibbald and Wolynetz (1987a) and Hartel (1987) has done little to clarify matters. However, Dale (1988), in a survey of ME data, found that for maize and soyabean meals, average values for AME n and TME n , determined at the University of Georgia and by Agriculture Canada, were the same and identical to those used by the poultry industry in the United States.…”

Section: Introductionmentioning

confidence: 95%

The estimation of endogenous excreta and the measurement of metabolisable energy in poultry feedstuffs using four feeding systems, four assay methods and four diets

Farrell

Thomson

Preez

et al. 1991

British Poultry Science

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1. Four different methods (dual semi-quick (DSQ), conventional, a true metabolisable energy (ATM) method and Farrell's rapid method) were used to measure in adult roosters the apparent metabolisable energy (AME) and true metabolisable energy (TME) of four maize-based diets with bran inclusions of 0, 200, 400 and 600 g/kg 2. Daily food intakes per bird were 75 g (or ad libitum) (H), 35 g (M) and 10 g (L). AME values determined by DSQ, conventional and Farrell methods were not different at the two highest intakes but were depressed at L intakes. ATM method often gave different values from other methods, particularly at the lowest intake. 3. The linear relationships between food intake and excreta energy yielded intercept values of 13 to 32 kJ/d for three methods; but ATM method yielded intercepts of 31 to 52 kJ/d. In a separate experiment it was demonstrated that a linear model may not be the most appropriate fit to such data. Removal of data for the 10 g/d intake yielded linear regression equations with intercepts not significantly different from zero for the two continuous feeding methods (i.e. a zero estimate for endogenous urinary and metabolic faecal energy (EEL), but for the two methods using a single input after fasting, intercepts were almost always positive. This confirms Härtel's (1986) observation of the absence of EEL under continuous feeding but its ever presence using a TME assay. 4. Correction of AME for EEL to obtain TME tended to increase values for all diets and also within a diet with decreasing intakes. The effect of correcting AME to nitrogen balance (n) was to give AME n values that were more consistent between diets and reduced differences between methods. For the conventional method differences between the three intakes on all diets were greatly reduced. 483 Downloaded by [] at 00:03 05 February 2015 484 D. J. FARRELL ETAL.5. There is reason to be concerned about the many different metabolisable energy values obtained using the ATM method compared to the three other methods and the basis for correcting for endogenous excreta. It is concluded that because of the uncertainty of EEL values, their variation and application, the AME system should be retained.

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Section: Introductionmentioning

confidence: 95%

The estimation of endogenous excreta and the measurement of metabolisable energy in poultry feedstuffs using four feeding systems, four assay methods and four diets

Farrell

Thomson

Preez

et al. 1991

British Poultry Science

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“…3) Yem alım düzeyinin 1/3 ad libitum miktarına inene kadar TME değerleri üzerine bir etkisinin olmadığı (21)…”

Section: Gme Belirleme Yöntemi Ve Değerleri üZerine Yapılan Eleştirilerunclassified

Kanatlılarda gerçek metabolize olabilir enerji tayini

Önal¹

1993

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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The determination of true metabolizable energy in poultry Summary: Thal' are several meıhods for assessing the metabolizable energı contenf of poultı)' feedstltffs. Thal' are advantages and disadvanfages associated with eaclı methods. One of these metllOds in is lIil'o tml' metaboliz:.able energı. Tmemetabolizable ener/tl values are usually independent~f feed (level of feed intakl', composition of basal ration and feed palatability), and bird (species, strain, sex, age, physiological state of the assay bird). Less variable and high reproducibilil)' of data are obtained. It is also relative!;)' rapid, regııhes a small qııantity of test mataia/, im'olves.few al/imals and invohes no expensive analyses. This review attemps tu nplain the true metabolizabiI' meıg)' and aıguements aboltt this method. Özet: Kanatlı)'em maddelerinin metabolize olabilir eneıji miktarını belirlemek için kullanılan birçok yiintem vardır. Her yö.ntemin avantaj ve dezavant ajları bulunur. Bıı yöntemlerden biri de invivo olarak gercek metabolize olabilir enerji ta)'inidir. Gerçek metabolize olabilir enerji ta)'iııi ile yeme ()'em tüketim düu}'i, temel rasyonun bileşimi ve)'eınin le:::.zetinegöre seçilip tüketilmesi), kanatLı.J'a (tür, ırk, cinsiyet,)'a.ş, .fi:çyo/~jik durum) bağlı olmayanL'e daha az: değişken, tekrarlanabilidik oranı)'üksek i'eriler elde edilmektedir. A}'Tlca gerçek metaholize olabilir el/erji tayininin,. kısa sürede tamamlanahilmesi, az:. miktarda yem numunesine /tereksinim duyulması, az sayıda hayvana ihtiyaç olması ve pahalı analizlere gereksinim olmaması gibi avantajları da vardır. Bu derleme, gerçek metabolize olabilir enerji trl)'ini ile bu yö'ntem üzerine yapılan eleştirileri iferinektedir.

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Energy supply to poultry

McNab

1999

J. Exp. Zool.

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Reply to Sibbald and Wolynetz

Cited by 4 publications

References 16 publications

The estimation of endogenous excreta and the measurement of metabolisable energy in poultry feedstuffs using four feeding systems, four assay methods and four diets

The estimation of endogenous excreta and the measurement of metabolisable energy in poultry feedstuffs using four feeding systems, four assay methods and four diets

Kanatlılarda gerçek metabolize olabilir enerji tayini

Energy supply to poultry

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