I wanted to follow one of their steers through the life cycle … I was also looking for a memorable face in this black Angus sea I could pick out of the crowd at the feedlot. …. [Steer #] 534 moseyed railing and made eye contact. He had a wide stout frame and was brockle-faced – he had three easy-to-spot white blazes. Here was my boy.
– Michael Pollan, The Omnivore's Dilemma

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BALDIES OR MOTTLED FACED?
I’ve always been fascinated by the markings on calves out of a Hereford-Angus cross. Some turn out with a true baldy or white face, some have goggle eyes while some have a very mottled face. Some refer to this latter appearance as brockle faced.

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When the Hereford Herd Book appeared in 1845 four different color types were in existence, and were eligible for registry. These were described as "mottled face, dark grey, light grey, and white faced." The mottled-faced probably corresponded to what are now called "brockle-faced" and were due to a dominant gene, P1, which causes not only the large pigmented spots on the face, but also extra pigment on the legs.

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C. 2. Sheep - Crosses between white face wool breeds and black face
mutton breeds are common.

a. they can be recognized by their spotted faces (brockle
face).

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BROCKLE-FACE or SMUTT-FACE----Commercial crossbred lambs from white-faced wool breed dams and black-faced sires, i.e. Suffolk, Hampshire or Suffolk-Hampshire cross.

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Brock, a badger. Pure Saxon. Dan. broak. V. Thompson.

Brock, a name sometimes given to a cow, or husbandry horse.

Brock, the little insect in the gowk, or cuckcoo-spit. Hence, I am informed, the common vulgar expression, To sweat like a brock."

Brock-Faced, a white longitudinal mark down the face like a badger. Su-Got. brokug of more than one colour [sic].

Brockle, Bruckle, inconstant, uncertain, variable; applied to the weather; It also means brittle and to break; in a general sense. Teut. brokel fragilis. Chaucer writes it brotel.