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Mixture design to study in vitro associative effects of feed mixtures

Published online by Cambridge University Press:  20 November 2017

CA Sandoval-Castro
Affiliation:
Fac. Veterinary Medicine & Animal Science - Univ. of Yucatan, Apdo. 4-116 Itzimna, Mérida, Yucatan, 97100 Mexico
J Barrera
Affiliation:
Fac. Veterinary Medicine & Animal Science - Univ. of Yucatan, Apdo. 4-116 Itzimna, Mérida, Yucatan, 97100 Mexico
L Capetillo
Affiliation:
Fac. Veterinary Medicine & Animal Science - Univ. of Yucatan, Apdo. 4-116 Itzimna, Mérida, Yucatan, 97100 Mexico
R Cetina
Affiliation:
Fac. Veterinary Medicine & Animal Science - Univ. of Yucatan, Apdo. 4-116 Itzimna, Mérida, Yucatan, 97100 Mexico
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Extract

Associative effects of feed mixtures have been studied looking at the differences (i.e. gas production) between single and mixed substrates, and significant differences have been found when fodder trees were mixed (Rosales et al., 1998). This may not be the more appropriate form to analyze mixtures, because small departures from simple additivity may result in significant differences as the sum of all its components equals one. Taking this fact into account mixture designs have been suggested as an adequate tool when dealing with mixtures (Mead, 1988). Mixtures design are a special class of response surface designs in which the sample under study is made up of several components or ingredients, thus the response depends on the relative proportion of the components. The objective of the present study was to asses the power of mixture designs to identify associative effects in feed mixtures.

Type
Poster Presentations
Copyright
Copyright © The British Society of Animal Science 2000

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References

Mead, R. 1988. The design of experiment. Cambridge Univ. Press, UK.Google Scholar
Rosales, M., Gill, M., Wood, C.D. & Speedy, W. 1998. Associative effects in vitro of mixtures of tropical fodder trees. In: Occasional publication No. 22 BSAS. Pp 175-177. Theodorou, MK, Williams, BA, Dhanoa, MS, McAllan AB & France J. 1994. A simple gas production method using a pressure transducer to determine the fermentation kinetics of ruminants feeds. Anim. Feed Sci. Technol. 48: 185197.Google Scholar