Statistical Analysis
The journal is keen to provide assistance to authors by identifying papers and editorials which provide useful information on correct statistical analysis, experimental design and correct use of units. The Editorial; "Digestibility and degradability in animal nutrition studies" by Wiseman (2018) provides recommendations on how to define digestibility and metabolisability in animal studies, a subject that is regularly incorrectly reported in submitted papers.
As far as statistical analysis and experimental design are concerned, a very helpful text is provided in the Instructions for Contributors section.
The paper "Effects of dietary supplementation of guanidino acetic acid on growth performance, thigh meat quality and development of small intestine in Partridge-Shank broilers" by Ren et al. (2018) describes the correct means of analysing incremental increases in a factor, for example concentration of a nutrient. Incremental increases in a factor need to be analysed through a POLYANOVA model that partitions variance into linear and non-linear contrasts. Individual treatments cannot be compared and thus superscripts are not valid; rather it is the overall response that is important. Similarly time is not a normal variable and cannot be included in a simple factorial model.
The additional papers accessible on this page provide further important guidelines for statistical analysis and experimental design.
Crops and Soils
The design and analysis of multi-phase plant breeding experiments
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- Journal:
- The Journal of Agricultural Science / Volume 144 / Issue 5 / October 2006
- Published online by Cambridge University Press:
- 04 September 2006, pp. 393-409
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Centenary Review
The analysis of crop cultivar breeding and evaluation trials: an overview of current mixed model approaches
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- Journal:
- The Journal of Agricultural Science / Volume 143 / Issue 6 / 2005
- Published online by Cambridge University Press:
- 20 September 2005, pp. 449-462
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Crops and Soils Research Papers
Multi-phase variety trials using both composite and individual replicate samples: a model-based design approach
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- Journal:
- The Journal of Agricultural Science / Volume 153 / Issue 6 / August 2015
- Published online by Cambridge University Press:
- 18 July 2014, pp. 1017-1029
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Animal Research Paper
Effects of dietary supplementation of guanidino acetic acid on growth performance, thigh meat quality and development of small intestine in Partridge-Shank broilers
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- Journal:
- The Journal of Agricultural Science / Volume 156 / Issue 9 / November 2018
- Published online by Cambridge University Press:
- 15 January 2019, pp. 1130-1137
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Editorial
Editorial: Digestibility and degradability in animal nutrition studies
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- Journal:
- The Journal of Agricultural Science / Volume 156 / Issue 10 / December 2018
- Published online by Cambridge University Press:
- 23 April 2019, pp. 1161-1162
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