Effects of milking frequency and milking time of day on milk composition of cows in an automated milking system
2003
Okamoto, M. (Rakuno Gakuen Univ., Ebetsu, Hokkaido (Japan)) | Na, R.
This study was conducted to determine the effects of frequency of milking and milking time on milk composition of cows in an automated milking system. Milking frequency ranged between 2.2 and 5.4 times per day. There was significant positive relationship between milking frequency and milk yield. There were also positive relationships between milking frequency and percentage of solid-not-fat and lactose, and a negative relationship with milk fat content. Milk protein percentage was highest at 3 to 4 times milking per day. Milk composition was affected by milking time of day. Total milk solid was high in the afternoon (12-18) and low in the morning (6-12) and midnight-early morning (0-6). Percentages of solid-not-fat and milk protein were high at night and low in the morning and in the midnight-early morning. Lactose content was high at night and midnight-early morning and low in the morning and in the afternoon. In contrast, milk fat content was high during the day (6-18) and low at night (18-6).
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