Dynamics of live weight in cows during the early lactation

作者：Hoy St^*; Bertho A; Reith Stefanie

来源：Zuchtungskunde, 2012, 84(3): 201-212.

• Dairy cows
• live weight
• parity
• day of lactation
• milk yield
• service period

Dynamics of live weight in cows during the early lactation %26lt;br%26gt;Data on live weight (measured daily with the Gravitor scale in the automatic milking system Astronaut A3) of 70 cows from 2 farms were available almost completely from calving until week 8 of lactation taking into account the parity number. The cows were classified concerning the postpartal live weight loss (above or below average) and the service period and number of inseminations per pregnancy were calculated in both groups. On average of all cows, live weight was decreased from 581 +/- 61 kg after calving to 576 +/- 59 kg on average of first week. The lowest live weight (532 +/- 55 kg) was reached after 42 +/- 27 days of lactation. Primiparous cows had the largest loss in body weight (9.7%, p = 0.059) and multiparous cows in the 2nd and 3rd lactation the lowest (6.9%) with significant differences between the herds (9.5, 6.2% respectively, p %26lt; 0.01). In tendency cows with a loss in body weight above average had a longer service period (141 +/- 11 days) and needed more inseminations per pregnancy (1.91 +/- 0.2) than cows with a loss in body weight below average (119 +/- 10 days, 1.46 +/- 0.2 inseminations respectively). Taking into account the effect of farm the differentiation regarding service period (152 vs 104 days) as well as number of inseminations (2.14 vs 1.25) was more pronounced.

• 出版日期2012-6