Aspects of this topic are discussed in the following places at Britannica.
Red-Poll-cow-and-calfRed Poll cow and calf.[Credits : © J.C. Allen and Son]
Thoroughbred-stallion-with-dark-bay-coatThoroughbred stallion with dark bay coat.[Credits : © Scott Smudsky]
The-mouse-at-bottom-is-heterozygous-with-a-mutant-geneThe mouse at bottom is heterozygous with a mutant gene that gives it a spotted tail. The two mice …[Credits : Inserm U636]
Black-Angus-bullBlack Angus bull.[Credits : Henry Elder/Encyclopædia Britannica, Inc.]
Female-pigs-can-have-as-many-as-20-piglets-inFemale pigs can have as many as 20 piglets in a litter. China holds the record for having the …[Credits : © Corbis]
German-shepherdGerman shepherd (Alsatian).[Credits : © Sally Anne Thompson/Animal Photography]
Holstein-Friesian-cowHolstein-Friesian cow.[Credits : Henry Elder/Encyclopædia Britannica, Inc.]
Duroc-boarDuroc boar.[Credits : Grant Heilman Photography]
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