1. Application of broken-line analysis to assess floor space requirements of nursery and grower-finisher pigs expressed on an allometric basis
- Author
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Gonyou, H. W., Brumm, M. C., Bush, E., Deen, J., Edwards, S. A., Fangman, T., Mcglone, J. J., Meunier-Salaun, M., Morrison, R. B., Spoolder, H., Sundberg, P. L., Anna Johnson, Prairie Swine Centre, Department of Animal Science, University of Nebraska System, United States Department of Agriculture - Animal and Plant Health Inspection Service, Partenaires INRAE, College of Veterinary Medicine, University of Minnesota [Twin Cities] (UMN), University of Minnesota System-University of Minnesota System, School of Agriculture, Food and Rural Development, University of Northumbria at Newcastle [United Kingdom], University of Missouri [Columbia] (Mizzou), University of Missouri System, TexasTech University, Systèmes d'Elevage, Nutrition Animale et Humaine (SENAH), Ecole Nationale Supérieure Agronomique de Rennes-Institut National de la Recherche Agronomique (INRA), Animal Sciences Group, Wageningen University and Research [Wageningen] (WUR), National Pork Board, and Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure Agronomique de Rennes
- Subjects
behavior ,stocking density ,swine ,virginiamycin ,BIEN-ETRE ANIMAL ,group-size ,allocation ,[SDV.SA.SPA]Life Sciences [q-bio]/Agricultural sciences/Animal production studies ,barrows ,WIAS ,pen space ,SURFACE AU SOL ,area allowance ,Wageningen Livestock Research ,ComputingMilieux_MISCELLANEOUS ,performance - Abstract
Few issues in swine production are as complex as floor space allowances. One method for pork producers to calculate floor space allowance (A) is to convert BW into a 2-dimensional concept yielding an expression of A = k * BW0.667. Data on ADG, ADFI, and G:F were obtained from published peer-reviewed studies. Five data sets were created: A = grower-finisher pigs, fully slatted floors, and consistent group size; B = grower-finisher pigs and fully slatted floors (group size did not need to be consistent); C = grower-finisher pigs, partially slatted floors, and consistent group size; D = grower-finisher pigs, partially slatted floors (group size did not need to be consistent); and E = nursery pigs, fully slatted or woven wire floors (group size did not need to be consistent). Each data set was analyzed using a broken-line analysis and a linear regression. For the broken-line analyses, the critical k value, below which a decrease in ADG occurred, varied from 0.0317 to 0.0348. In all cases the effect of space allowance on ADG was significant (P
- Published
- 2006