System analysis are used to study the main factors and their interrelations which affect economic efficiency of animal breeding improvement and the optimization of animal breeding scheme.

应用系统分析的思想和方法，分析了影响动物育种改良经济效益的主要因素及相互关系，并在定量描述这些相互关系的基础上探讨了育种方案的优化方法。

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The list can seem endless because the governments in this region are on aggressive privatization plans, which include health spas, pottery manufacturers and, in Poland, even an animal-breeding station.

WSJ: For Sale: Eastern Europe | WSJ.Money Summer 2013

"The animals here are all here because we're helping them survive as a species, " Mr. Lukas said, referring to the plantation's extensive breeding and animal-rehabilitation programs.

WSJ: Hard Times Force Famed Southern Refuge's Sale

Since extremists first targeted small animal-breeders, in 1997, they have closed down four outfits, breeding dogs, cats, monkeys and rabbits.

ECONOMIST: Animal rights extremists