Lactation Curve Pattern and Prediction of Milk Production Performance in Crossbred Cows
Table 1
Parity-wise lactation curve parameters (gamma type function) for prediction of fortnightly test-day milk yield (kg) in Karan Fries crossbred cows.
Karan Fries cows
Parameters
1st parity
2nd parity
3rd parity
4th parity
5th and above parity
Normal cows
Mastitis cows
Normal cows
Mastitis cows
Normal cows
Mastitis cows
Normal cows
Mastitis cows
Normal cows
Mastitis cows
11.28
10.35
14.78
13.57
16.08
14.03
16.45
14.42
15.09
13.57
0.254
0.255
0.202
0.213
0.259
0.243
0.333
0.281
0.358
0.310
0.041
0.043
0.045
0.053
0.056
0.053
0.072
0.063
0.070
0.070
Persistency
54.34
51.41
41.96
35.30
37.59
38.50
33.51
34.82
36.56
33.67
Fortnight of PMY
6.15
5.88
4.53
4.02
4.61
4.58
4.64
4.49
5.07
4.55
Fortnightly PMY (kg)
13.89
12.58
16.39
18.04
18.44
15.93
19.67
16.61
18.85
15.94
value (%)
84.88
83.93
93.03
94.87
97.43
95.42
98.18
95.52
94.84
97.68
RMSE (kg)
0.08
0.11
0.12
0.11
0.09
0.11
0.10
0.13
0.16
0.09
( is the initial milk yield after calving; is the ascending slope parameter up to peak yield; is the descending slope parameter; RMSE is the root mean square error; is the coefficient of determination of variation; and PMY is the peak milk yield).
