Dairy Sheep Symposium - the Department of Animal Sciences ...

Table 1. Least squares means and SEM for milk yield and milk composition traits.
Milking interval treatment (h) 1
Trait 4 8 12 16 20 24
Milk yield
Treatment yield, kg 0.39 f
SEM 0.04
Cisternal fraction, % 32.2 d
SEM 1.8
12 h before treatment, kg 1.21 a
12 h after treatment, kg 1.19 a
SEM 0.04
Total 3-d yield, kg 7.24 a
SEM 0.08
Milk composition
Milk fat, % 9.20 a
SEM 0.13
Milk fat, g 36.3 f
SEM 2.4
Milk protein, % 4.13 d
SEM 0.03
Milk protein, g 15.2 f
SEM 1.7
SCC, log units 5.29 a
SEM 0.04
0.81 e
37.8 c
1.24 a
1.17 a
7.23 a
7.07 b
57.2 e
4.31 c
34.4 e
5.11 b
1.28 d
46.9 b
1.23 a
1.18 a
7.31 a
6.26 c
78.5 d
4.51 b
56.8 d
5.08 b
1.52 c
52.4 b
1.28 a
1.10 b
7.16 a
5.78 d
86.5 c
4.58 b
68.9 c
4.96 c
1.86 b
51.0 b
1.25 a
1.06 b
6.89 b
5.67 d
104.1 b
4.57 b
84.2 b
4.94 c
a,b,c,d,e,f Means within a row(s) with different subscripts differ (P < 0.05).
1 The first milking of a 3-d period occurred at 4, 8, 12, 16, 20, or 24 h (n = 32) respective
to initial udder emptying with oxytocin at 0 h. Subsequent milkings during the 3-d period
occurred at 0630 and 1830.
2.28 a
57.4 a
1.26 a
1.06 b
6.85 b
5.72 d
127.5 a
4.65 a
104.8 a
5.02 bc