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Reporting the results:

 

Effects of reproduction on foraging behaviour in bighorn sheep

There is a difference between the time ewes spent grazing when they did not have a lamb compared to the time they spent grazing when they did have a lamb (Figure 1) (paired t-test: t = 2.226, df = 15, P < 0.05)

 

box plot of time spent grazing by ewes with and without lambs

Figure 1. Time spent grazing by bighorn ewes with and without lambs