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| The air pressure within the building is slightly lower than outside, causing air to be drawn into the building. |
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| The air pressure is equal inside and outside of the building. Fans are used to both draw air in and force air out of the building. |
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| Supplying unique pork and pork products in a way that specific customer segments prefer or value. Does not use traditional commodity market channels and does not necessarily mean "small". |
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| Favorable effects or actions produced by specific gene pairs or combinations. Nonadditive gene action is the primary cause of heterosis and occurs when the heterozygous genotype is not intermediate in phenotypic value to the two homozygous genotypes. |
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| Total number of days that elapse between the first service date and the date when a sow is culled dies, aborts, or is repeat served or fails to farrow. The number of days that a sow is kept in a herd while she is nonproductive. |
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| A sow that fails to become pregnant up to 110 days after a presumed effective service. |
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| National Research Council. |
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| Grandparent genetic stock that supplies purebred females to the multiplier herds and boars to the multipliers and commercial herds. |
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| Total pigs born, minus the stillborn and mummified pigs. |
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| The number of animals of similar breed, sex and age, against which an animal is compared in performance tests. The greater the number of contemporaries, the greater the accuracy of comparison. |
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| See: Late foster sow. |
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| A place for housing either (a) lactating sows and their piglets (older term) or (b) weaning pigs (newer term). |
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| Pigs from weaning to 50 pound (25 kg) (see weaner). |
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| Specialized housing for newly weaned pig that lacks supplementary heating. |
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| Specialized housing for newly weaned pig that has supplementary heating. Syn: Flat deck. |
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| Specialized, temperature-controlled housing for early-weaned pigs (3 to 4-wk-old until 6 wk. old). |
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| A pig that has not been weaned. |
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| A chemical substance that nourishes, such as protein, carbohydrate, mineral or vitamin. |
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