Compared to the unstressed monkeys, they were much less likely to ovulate.

与没有处在压力下的猴子相比，她们排卵的可能性要小得多。

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A small dose of a hormone, for example, can cause a woman to ovulate, while a larger dose can make her infertile.

例如，小剂量激素可致女排卵，而更大剂量激素却可导致她不孕。

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But an extra serving per day of low-fat dairy food, such as yoghurt, appeared to increase the risk of failing to ovulate by 11%.

每天若额外吃一份低脂乳品，如酸奶，可能会增加不排卵不孕症的危险，且几率达到11%。

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Some experts think it's because a woman is less likely to ovulate while she's breast-feeding.

NPR: Study: Breast-Feeding Decreases Cancer Risk

Women with reasonably regular cycles are likely to be the most likely to benefit from this - those with erratic menstrual cycles or who do not ovulate at all are unlikely to be suitable for natural cycle treatment.

BBC: Cut in fertility drugs urged