Table 2 Average (± SEM) and confidence intervals (95%) for production parameters of eliminated cows (slaughtered and dead) over 11 years (2006–2016) in five farms

Number of milking cows (n)

140 ± 4

340 ± 9

600 ± 15

420 ± 8

181 ± 6

NA

NA

NA

Number of daily milkings

2

3

3

3

2

NA

NA

NA

NL

3.4 ± 0.1^a

3.6 ± 0.1^b

2.9 ± 0.1^c

2.7 ± 0.1^d

3.2 ± 0.1^a

3 ± 0.1

3 ± 0.1^A

3.2 ± 0.1^B

(3.1–3.6)

(3.5–3.7)

(2.8–3.0)

(2.6–2.8)

(3.1–3.3)

(3.0–3.1)

(2.9–3.1)

(3.1–3.3)

DL (days)

2092 ± 45^a

2171 ± 26^b

1943 ± 23^c

1775 ± 15^d

1935 ± 26^c,e

1939 ± 11

1958 ± 12^A

1861 ± 23^B

(2004.3–2181.1)

(2120.9–2221.3)

(1897.7–1989.1)

(1745.0–1804.1)

(1884.9–1985.3)

(1913.3–1960.7)

(1935–1981)

(1815–1906)

tDIM (days)

1127 ± 38^a

1203 ± 21^b

948 ± 18^c

842 ± 12^d

1002 ± 22^e

984 ± 9

1003 ± 10^A

902 ± 19^B

(1054.6–1202.3)

(1160.8–1245.3)

(912.7–982.6)

(819.5–867.9)

(980.1–1031.5)

(967.8–1001.9)

(984–1022)

(865–939)

LMY (litres)

38,607 ± 1353^a,d

39,001 ± 765^a

31,183 ± 629^b

23,897 ± 374^c

34,134 ± 787^d

31,120 ± 303

31,426 ± 338^A

29,852 ± 685^B

(35,467.3–40,782.6)

(37,499.9–40,503.8)

(29,949.6–32,417.3)

(23,156.3–24,623.5)

(32,589.8–35,678.3)

(30,527.4–31,716.2)

(30,763–32,089)

(28,507–31,196)

LPL (litres)

32.4 ± 0.4^a

30.8 ± 0.2^b

31.5 ± 0.2^c

27.0 ± 0.2^d

32.7 ± 0.2^a

29.9 ± 0.2

29.8 ± 0.1^A

30.8 ± 03^B

(31.7–33.1)

(30.3–31.2)

(31.2–31.9)

(26.7–27.3)

(32.1–33.1)

(29.8–30.2)

(29.6–30)

(30.3–31.3)

LDL (litres)

16.6 ± 0.4^a

16.2 ± 0.2^a

14.6 ± 0.2^b

12.2 ± 0.1^c

15.9 ± 0.2^a

14.4 ± 0.1

14.4 ± 0.1^A

14.2 ± 0.2^A

(16.0–17.5)

(15.8–16.5)

(14.3–15.0)

(11.9–12.4)

(15.6–16.4)

(14.2–14.6)

(14.3–14.6)

(13.7–14.6)