1. Provimi Holding B.V., Research Centre De Viersprong, Veilingweg 23, 5334 LD, Velddriel, the Netherlands
2. Department of Animal Nutrition and Pasture Management, Instituto de Zootecnia/APTA, Rua Heitor Penteado 56, CEP 134600-000, Nova Odessa, SP, Brazil
3. Animal Nutrition Group, Wageningen University, P.O. Box 338, 6700 AH Wageningen, the Netherlands