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Special Topics 504: Practical Methods in Analyzing Animal Science Experiments

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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

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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.

Ho: μ21 = μ22 = μ23 = μ24 = μ25

Ha: Specific Growth Rates are not the same in all five diets.

SexTrt1 Trt2 Trt3 Trt4 Trt5

Male 28.2 39.6 46.3 41.0 56.3

Male 33.2 40.8 42.1 44.1 54.1

Female 36.4 37.9 43.5 46.4 59.4

Male 34.6 37.1 48.8 40.2 62.7

Female 29.1 43.6 43.7 38.6 60.0

Female 31.0 42.4 40.1 36.3 57.3

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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.

1

2

3

Entries are written as

(r, c, t)

2

3

1

3

1

2

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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

Treated

Control

Control

Treated

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