Table 2.
The linear trend of milk yield (kg) per animal per year for each country between 1961 and 2018. The list of countries is limited to the world’s top high milk-producing countries for which we were able to provide sufficient and reliable data on the length of productive life.
| Country | Model 1 | R 2,3 | RSE 4 | p-Value 5 | |
|---|---|---|---|---|---|
| Intercept 2 | Year 2 | ||||
| United States of America | 2941.6 *** (40.6) |
129.7 *** (1.20) |
0.99 | 152.5 | <0.001 |
| Brazil | 451.2 *** (50.4) |
18.5 *** (1.49) |
0.73 | 189.5 | <0.001 |
| Germany | 2904.6 *** (83.4) |
81.4 *** (2.46) |
0.95 | 313.4 | <0.001 |
| France | 2103.8 *** (56.8) |
91.9 *** (1.68) |
0.98 | 213.6 | <0.001 |
| New Zealand | 2419.1 *** (70.9) |
29.0 *** (2.09) |
0.77 | 266.7 | <0.001 |
| Poland | 1603.6 *** (107.4) |
65.3 *** (3.17) |
0.88 | 403.8 | <0.001 |
| Italy | 2200.5 *** (91.3) |
72.5 *** (2.69) |
0.93 | 343.1 | <0.001 |
| Canada | 2081.3 *** (84.1) |
120.7 *** (2.48) |
0.98 | 316.3 | <0.001 |
| Ireland | 2035.0 *** (53.3) |
59.9 *** (1.57) |
0.96 | 200.5 | <0.001 |
1 *** = p-value < 0.01; 2 Estimate (Standard error); 3 R2 = Coefficient of determination; 4 RSE = Residual standard error; 5 Model significance.