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: 199–203) 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 8.6 Obs 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.
A deficiency of the trace element selenium in the diet
can negatively impact growth, immunity, muscle and
neuromuscular
of selenium supplements to dairy cows is justified
when pastures have low selenium levels. Authors of
the article “Effects of Short-Term Supplementation
with Selenised Yeast on Milk Production and
Composition of Lactating Cows” (Australian J. of
Dairy Tech., 2004: 199–203) supplied the following
data on milk selenium concentration (mg/L) for a
sample of cows given a selenium supplement and a
control sample given no supplement, both initially and
after a 9-day period.
Obs Init Se Init Cont Final Se Final Cont
1 11.4 9.1 138.3 9.3
2 9.6 8.7 104.0 8.8
3 10.1 9.7 96.4 8.8
4 8.5 10.8 89.0 10.1
5 10.3 10.9 88.0 9.6
6 10.6 10.6 103.8 8.6
Obs Init Se Init Cont Final Se Final Cont
7 11.8 10.1 147.3 10.4
8 9.8 12.3 97.1 12.4
9 10.9 8.8 172.6 9.3
10 10.3 10.4 146.3 9.5
11 10.2 10.9 99.0 8.4
12 11.4 10.4 122.3 8.7
13 9.2 11.6 103.0 12.5
14 10.6 10.9 117.8 9.1
15 10.8 121.5
16 8.2 93.0
a. Do the initial Se concentrations for the supplement
and control samples appear to be similar? Use various
techniques from this chapter to summarize the
data and answer the question posed.
b. Again use methods from this chapter to summarize
the data and then describe how the final Se concentration
values in the treatment group differ from
those in the control group.
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