A deficiency of the trace element selenium in the dietcan

Chapter 1, Problem 66

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A deficiency of the trace element selenium in the dietcan negatively impact growth, immunity, muscle andneuromuscular function, and fertility. The introductionof selenium supplements to dairy cows is justifiedwhen pastures have low selenium levels. Authors ofthe article Effects of Short-Term Supplementationwith Selenised Yeast on Milk Production andComposition of Lactating Cows (Australian J. ofDairy Tech., 2004: 199203) supplied the followingdata on milk selenium concentration (mg/L) for asample of cows given a selenium supplement and acontrol sample given no supplement, both initially andafter a 9-day period.Obs Init Se Init Cont Final Se Final Cont1 11.4 9.1 138.3 9.32 9.6 8.7 104.0 8.83 10.1 9.7 96.4 8.84 8.5 10.8 89.0 10.15 10.3 10.9 88.0 9.66 10.6 10.6 103.8 8.6Obs Init Se Init Cont Final Se Final Cont7 11.8 10.1 147.3 10.48 9.8 12.3 97.1 12.49 10.9 8.8 172.6 9.310 10.3 10.4 146.3 9.511 10.2 10.9 99.0 8.412 11.4 10.4 122.3 8.713 9.2 11.6 103.0 12.514 10.6 10.9 117.8 9.115 10.8 121.516 8.2 93.0a. Do the initial Se concentrations for the supplementand control samples appear to be similar? Use varioustechniques from this chapter to summarize thedata and answer the question posed.b. Again use methods from this chapter to summarizethe data and then describe how the final Se concentrationvalues in the treatment group differ fromthose in the control group.