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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)

Time spent grazing by bighorn ewes with and without lambs
Figure 1. Time spent grazing by bighorn ewes with and without lambs
(Source: Ruckstuhl, KE and Festa-Bianchet, M (1998) Do reproductive status and lamb gender affect the foraging behaviour of bighorn ewes? Ethology 104 941-54.)