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Table 2 Descriptive statistics of the test-day records of milk yield (kg) for some selected days in milk with 3X and 4X milking frequency

From: Influence of milking frequency on genetic parameters associated with the milk production in the first and second lactations of Iranian Holstein dairy cows using random regression test day models

  3X Milking 4X Milking
Lact 1 Lact 2 Lact 1 Lact 2
DIM N Mean SD N Mean SD N Mean SD N Mean SD
5–35 6392 29.7 4.9 7691 38 6.3 1142 32.5 5 1313 41.8 6.1
36–65 7022 33.4 4.9 8218 40.7 6.4 1298 37.3 4.8 1374 46.1 6.2
66–95 7097 33.9 5.1 8246 40.2 6.6 1292 38.6 4.9 1375 45.8 6.2
96–125 7430 33.4 5 8778 38.6 6.6 1336 38 4.8 1467 43.8 6.2
126–155 6816 32.8 5.3 7815 36.4 6.7 1330 37.2 4.8 1448 41.3 6.1
156–185 6293 32.4 5.4 7057 34.4 6.7 1375 36.4 4.8 1394 38.8 5.9
186–225 5234 31.8 5.6 5456 32.5 6.7 1336 35.4 4.7 1260 36.6 6.3
226–245 4287 31 5.6 4138 30.9 6.8 1324 34.4 4.6 1217 34.2 6.3
246–275 3105 30 5.7 2702 29.1 6.7 1318 39 4.5 1045 31.8 6.2
276–305 1938 29.2 5.8 1453 26.7 6.1 1045 31.9 4.8 747 29.8 6