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2. Perez, R.; Valenzuela, S.; Merino, V. Energetic require ments and physiological adaptation of draught horses to ploughing work. Animal Sci. 1996, 63, 343 351.

3. Pearson, R.A.; Zerbini, E.; Lawrence, P.R. Recent ad vances in research on draught animals. Animal Sci. 1999, 68, 1 17.

4. Empowering Farmers with Animal Traction, Proceedings of the Workshop of the Animal Traction Network for Eastern and Southern Africa (ATNESA), Mpumalanga, South Africa, Sept. 20 24, 1999; Kaumbutho, P., Pearson, R.A., Simalenga, T.S., Eds.; SANAT: South Africa, 2000. ISBN 0 907146 10 4.

5. Working Animals in Agriculture and Transport. A Collection of Some Current Research and Development Observations. In EAAP Technical Series No 6; Pearson, R.A., Lhoste, P., Saastamoinen, M., Martin Rosset, W., Eds.; Wageningen Academic Publishers: The Netherlands, 2003; 209.

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