Table 10.
Plasma and serum data during preconditioning (days 300 to 345) of first offspring1 born to cows offered no prepartum supplementation (NOSUP) and 1 kg/d of low-fat (LFAT) or high-fat (HFAT) bakery waste-based supplement from days 0 to 70 (6 pastures per maternal treatment; 6 cows and 4.3 ha per pasture)
| Item2,3 | Maternal treatment1 | SEM | P-value | |||
|---|---|---|---|---|---|---|
| NOSUP | LFAT | HFAT | Maternal treatment | Maternal treatment × day of the study | ||
| Plasma cortisol, µg/dL | 2.50b | 2.20ab | 1.91a | 0.201 | 0.10 | 0.38 |
| Plasma haptoglobin, mg/mL | 0.79 | 0.81 | 0.71 | 0.064 | 0.56 | 0.63 |
| Serum BVDV-1 | ||||||
| Titers, log2 | 7.38 | 8.11 | 7.97 | 0.508 | 0.51 | 0.74 |
| Seroconversion, % total | 97.8 | 100 | 97.2 | 2.07 | 0.61 | 0.30 |
| Serum IBR | ||||||
| Titers, log2 | ||||||
| Day 292 (weaning) | 0.47a | 1.00a | 0.33a | 0.489 | 0.12 | <0.01 |
| Day 315 (first vaccination) | 4.80b | 3.68a | 5.50b | 0.489 | ||
| Day 345 (end of preconditioning) | 5.20ab | 4.22a | 5.83b | 0.489 | ||
| Seroconversion, % total | ||||||
| Day 292 (weaning) | 20.0a | 38.5b | 8.3a | 8.11 | 0.02 | 0.08 |
| Day 315 (first vaccination) | 100a | 100a | 100a | 8.11 | ||
| Day 345 (end of preconditioning) | 100a | 100a | 100a | 8.11 | ||
| Serum PI3 | ||||||
| Titers, log2 | 4.60 | 3.99 | 4.33 | 0.488 | 0.64 | 0.77 |
| Seroconversion, % total | ||||||
| Day 292 (weaning) | 66.7a | 61.5a | 50.0a | 11.3 | 0.56 | 0.08 |
| Day 315 (first vaccination) | 60.0a | 69.2a | 100b | 11.3 | ||
| Day 345 (end of preconditioning) | 93.3a | 100a | 100a | 11.3 | ||
| Serum BRSV | ||||||
| Titers, log2 | ||||||
| Day 292 (weaning) | 1.80xy | 2.31x | 0.92y | 0.569 | 0.96 | 0.09 |
| Day 315 (first vaccination) | 3.87a | 3.62a | 4.33a | 0.569 | ||
| Day 345 (end of preconditioning) | 5.40xy | 5.11x | 6.25y | 0.569 | ||
| Seroconversion, % total | ||||||
| Day 292 (weaning) | 80.0b | 84.6b | 41.7a | 7.29 | 0.03 | 0.01 |
| Day 315 (first vaccination) | 100a | 100a | 100a | 7.29 | ||
| Day 345 (end of preconditioning) | 100a | 100a | 100a | 7.29 | ||
1On day 292 (weaning), 3 heifers per pasture were randomly selected from 5 pastures per maternal treatment.
2Heifers received an oral anthelmintic (Merck Animal Health) and were vaccinated with Bovi Shield Gold One Shot and Ultrabac 8 (Zoetis) on day 300 and revaccinated with Bovi Shield Gold 5 and Ultrabac 8 on day 315.
3Serum titers reported as log2 of the greatest dilution of serum that provided complete cell protection. Heifers were considered seropositive if they had serum neutralization values ≥ 4.
a,bWithin a row, means without common superscript differ (P ≤ 0.05).