twinning

twinning /twin·ning/ (twin´ing)

1. the production of symmetrical structures or parts by division.

2. the simultaneous intrauterine production of two or more embryos.

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twin·ning (twnng)

n.

1. The bearing of twins.

2. A pairing or union of two similar or identical objects.

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twinning

1. the production of symmetrical structures or parts by division.

2. the simultaneous intrauterine production of two or more embryos. Twinning is a desirable feature in animals that depend for their profitability on the production of young, e.g. lambs of the meat-producing breeds, and selection for the characteristic is a standard husbandry strategy. In animals that are essentially uniparous, e.g. mares, twins represent a danger to the foals and to the mare. Twins in which one is a female and one a male have the added risk of the female being a freemartin.