Table 1.

Comparisons of farm and calf data and sTP and sIgG concentrations in neonatal calves fed colostrum (n = 146) or a bovine serum-based CR product followed by a bovine serum-based CS product (141).

	Farm								All farms
Variable	1	2	3	4	5	6	7	8	Total	Mean ± SD
Breed	Holstein	Holstein	Holstein	Holstein	Holstein	Jersey	Holstein	Holstein	—	—
No. of calves	31	16	81	45	23	18	45	28	287	—
No. of calves fed colostrum†	16	7	43	21	13	9	21	11	141	—
No. of calves fed CR-CS products	15	9	38	24	10	9	24	17	146	—
sTP (g/dL) in calves fed colostrum*	6.0 ± 0.8	5.4 ± 0.5	5.4 ± 0.7	5.5 ± 0.5	5.6 ± 0.7	5.6 ± 0.6	5.5 ± 0.9	6.1 ± 1.0	—	5.6 ± 0.7
sTP (g/dL) in calves fed CR-CS products*	5.5 ± 0.4	5.2 ± 0.3	5.2 ± 0.6	5.1 ± 0.5	5.5 ± 1.3	5.5 ± 0.3	5.2 ± 0.5	5.3 ± 0.4	—	5.3 ± 0.5
sIgG (mg/dL) in calves fed colostrum*	1,414 ± 785	1,376 ± 534	1,892 ± 884	1,622 ± 806	2,014 ± 662	2,227 ± 985	1,657 ± 704	2,124 ± 1,027	—	1,868 ± 853
sIgG (mg/dL) in calves fed CR-CS products*	1,475 ± 317	1,431 ± 571	1,258 ± 445	1,131 ± 855	1,730 ± 1,366	1,966 ± 819	1,288 ± 613	1,234 ± 458	—	1,348 ± 693
No. of calves with sIgG concentrations ≥ 1,000 mg/dL	14	5	37	14	12	7	18	8	115	—
No. of calves fed CR-CS products with sIgG concentrations ≥ 1,000 mg/dL	15	8	31	9	7	8	16	9	103	—

For calves in the colostrum-fed group, 4 L of colostrum was fed in 1 or 2 divided feedings (first feeding was provided ≤ 2 hours after birth; when applicable, a second feeding was provided between 2 and 12 hours after birth); other calves received 2 L of a CR product and then 2 L of a CS product ≤ 2 hours and between 2 and 12 hours after birth, respectively.

^*Values are reported as mean ± SD.

^†Information was not collected for the number of calves that were fed colostrum during a single feeding versus 2 feedings.

— = Not determined.