The herd size is what makes pastoralism a bit economical, but once the herd size shrinks it becomes really uneconomical.

让游牧很经济的是畜群规模，但是一旦畜群规模缩小，游牧就会变得相当不划算。

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We simulated the impacts of breeding herd size, reproductive skew and numbers of breeding stags on the inbreeding coefficient of Père David's deer.

模拟分析了繁殖群体大小、繁殖偏倚和占群优势雄性数目对麋鹿的有效种群大小的影响。

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"Nature controls the size of the herd," says Mathis's brother, Nils Peder.

“自然界在控制着鹿群的大小，”马特·希斯的兄弟尼尔斯·皮德尔说。

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But bizarrely as the size of the herd has gone down, the size of individual steers has gone up.

BBC: Smaller, fewer, thinner - the future for American beef?

The Al-Rafiqs plan to double the size of their herd, to 1, 000 goats, by 2010.

FORBES: Magazine Article

Despite introducing efficiencies and increasing the size of his herd to about 150 cows, Mr Downes said many of the costs he and fellow farmers faced were out of their control.

BBC: Richard Downes