Sentence examples for difficult to breed from inspiring English sources

These resistances are difficult to breed for using classical breeding because of the quantitative nature of the resistances and/or elaborate disease tests.

In terms of breeding, this means that it is difficult to breed for rootstocks conferring both reduced tree size and precocity to the scion cultivar.

The Cia40/Pregq2 congenic mice were difficult to breed and congenic mice of both sexes showed disturbed breeding behavior.

Scientists say chickens, unlike plants, are difficult to breed naturally to make them resistant to disease.

Unfortunately, the same characteristic means that it is fiendishly difficult to breed better bananas.

The particular Snowshoe look is difficult to breed, so registered purebred Snowshoe cats are rare.

A nuclear family of difficult-to-breed Bell's hingebacks -- African tortoises whose rear ends can fold up a little like the trunk of a car -- plodded off with best in show.

Texas Parks and Wildlife Department officials will not speak for or against pending legislation, but officials have expressed some concern that noodling could deplete isolated populations of the long-lived and difficult-to-breed flathead catfish, the species that noodlers typically pursue.

PD: What's interesting is that CRISPR really brings down the cost of creating a new seed line or incorporating traits from a difficult-to-breed seed.

Since porcine retroviruses are embedded in the swine genome, it would be difficult to selectively breed pigs free of PERV and other pathogens.

She knows how hugely difficult it is to breed or own a horse of a high-class calibre".