TABLE E-3 Summary of Selected Findings for Fluoride-Exposed Dairy Cows

Herda

Number Observed

Urinary Fluoride, mg/Lb

Serum T4, µg/dLc

Serum T3, ng/dLd

Plasma Calcium, mg/dLe

W

12

2.92 ± 0.52

4.60 ± 0.34

175 ± 7.2

10.1 ± 0.15

B

12

5.37 ± 0.43

4.83 ± 0.19

168 ± 5.8

9.5 ± 0.11

M

12

6.39 ± 0.92

5.30 ± 0.38

177 ± 8.4

9.6 ± 0.11

G

12

6.33 ± 0.74

4.82 ± 0.28

159 ± 7.7

9.4 ± 0.15

P

12

3.47 ± 0.47

9.3 ± 0.12

S1

12

6.29 ± 1.08

3.59 ± 0.26

126 ± 8.4

9.1 ± 0.17

C4

9

f

2.21 ± 0.54

9.5 ± 0.14

V3

10

3.35 ± 0.47

9.5 ± 0.13

B2

13

3.39 ± 0.42

8.9 ± 0.12

aHerd identification as reported by Hillman et al. (1979). Enamel fluorosis and elevated bone fluoride were confirmed in herds S1, C4, V3, and B2. Cows were uniformly distributed throughout lactation in all herds.

bW < all others (P < 0.05).

cC4 < all others; S1, V3, B2 < W, B, M, G (P < 0.05).

dS1 < W, B, M, G (P < 0.05).

eB2 < M, W; S1, P, G < W (P < 0.05).

f—indicates not measured or not reported.

SOURCE: Hillman et al. 1979. Reprinted with permission; copyright 1979, Journal of Dairy Science.



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