Hoof trimming is a common practice on dairy operations to treat and prevent lameness. However, more information on claw anatomy of Jersey (JE) cows is needed before trimming guidelines can be developed for this dairy breed. The objective of this study was to describe anatomical structures of cadaver claws from JE cows. Rear claws (n = 39) from 8 primiparous and 12 multiparous JE cows with 5 to 277 DIM were collected from 3 commercial dairies in California. The following measurements were performed in intact claws: sole width (SW), heel height (HH), dorsal wall length (DWL), sole thickness (ST) and dorsal wall angle (DWA). Measurements were obtained using a precision goniometer (±0.3°) and caliper (±0.01 mm). Each toe was divided sagittaly using a band saw to measure ST at the apical margin of distal phalanx. Descriptive statistics were performed with the Proc MEANS and UNIVARIATE of SAS (version 9.4). Results (means, range) are shown in Table 1. The lateral toe was 7% wider than the medial toe in primiparous cows whereas in multiparous cows lateral toe was 1.4% longer and 13.5% wider than the medial toe. Based on industry-wide recommendations the DWL should never be trimmed below 75 mm to ensure ST of at least 7 mm and the DWA should be within 45° to 52°. In our study, primiparous cows had toes with DWL <75 mm (93.8%), ST <7 mm (46.8%) and DWA within 45° to 52° (59.3%). Multiparous cows had toes with DWL <75 mm (32.7%), ST <7 mm (39%) and DWA within 45° to 52° (58.6%).There are thin soles in JE. More studies are needed before trimming guidelines are developed for JE cows. Table 1. Descriptive statistics of measurements from 39 JE claws, mean (range)

	Parity	SW (mm)	DWL (mm)	HH (mm)	ST (mm)	DWA (°)
Lateral	1	46 (40–52)	69 (61–77)	26 (19–33)	6.8 (3.1–10.4)	50 (41–59)
	>1	48 (44–55)	73 (67–80)	27 (20–35)	7.8 (4.8–11.3)	48 (41–58)
Medial	1	43 (37–51)	69 (62–80)	23 (42–58)	6.8 (4.8–9.6)	50 (42–58)
	>1	43 (39–50)	72 (67–77)	22 (15–30)	7.5 (3.6–11)	48 (39–57)