Special Topics 504: Practical Methods in Analyzing Animal Science Experiments Factorial Designs Five different levels of probiotic treatments are tested on male and female trout in a 4 week feeding trial. H o : μ 2 1 = μ 2 2 = μ 2 3 = μ 2 4 = μ 2 5 Ha: Specific Growth Rates are not the same in all five diets. SexTrt1Trt2Trt3Trt4Trt5 Male Male Female Male Female Female

Special Topics 504: Practical Methods in Analyzing Animal Science Experiments Latin Square Latin square designs (they are essentially Cayley tables) are used often in pond culture. A typical Latin square is a table of n x n filled with different treatments in such a way that each treatment occurs in only once in each row or column Entries are written as (r, c, t)

Special Topics 504: Practical Methods in Analyzing Animal Science Experiments Latin Square Latin squares are most often used in cross-over designs which are economical and used to examine both a test group and control group with the groups reversed after a period of time. T0 – T1 T1 – T2 TreatedControl Treated