Sentence examples for difficult to breed in from inspiring English sources
"Oryx are not difficult to breed in captivity or to reintroduce".
The reddish parachute spider (Poecilotheria rufilata), in particular, is difficult to breed in captivity, and requires wild individuals.
Little is known of its reproduction and development, as the species is very difficult to breed in captivity.
The sight of 14 cubs in one place is striking not just for its overwhelming cuteness but because pandas are notoriously difficult to breed in captivity.
In utero electroporation is challenging in transgenic or knockin mouse strains that have smaller litters, are more difficult to breed in large numbers, and are more sensitive to surgical manipulations.
G. campestris were more difficult to breed in the lab for multiple generations and crickets were therefore specifically collected for the different experiments close to Oviedo, northern Spain (in 2006 and 2009/2010 for the polyandry and mate choice experiments respectively).
That is why it is so difficult to breed animals in zoos.
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.
But they are not nearly as difficult to breed as pandas, which have not produced a cub in captivity in the United States since 2010.
Such traits are the most difficult to breed for, typically requiring large-scale, multi-environment testing in order to obtain sufficient progress from selection.
