First, the lactation law of cows in different lactation months Cows in different lactation months in the same lactation period of milk production, often with its variety, individual, health and age conditions, as well as different feeding and management. Usually after milking cows, milk production gradually rises, peaks around the second or third lactation month, and then gradually declines. Generally, the high-yield cattle increase greatly, the curve is stable at the peak, and the decline is slow, so the cattle Postpartum milk production can rise quickly and maintain a longer period during peak periods, resulting in higher total milk production. And even those with the highest milk yields, but the rapid decline, the rate of large total milk production is low.
Second, lactation milk cows of different ages and parity cows' milk production varies with age and parity. Generally, the first-born cows have poor lactation capacity due to their immature body, and their milk yield is less than 80% to 85% of the peak fetal milk production. With age, parity and body maturation, the third or The fourth child can reach the highest milking times, and some cows can maintain a maximum of 8 tires at the peak of milk production under the conditions of good husbandry and management and full feed price, but most cows produce milk at 5-6 tires. Has fallen.
Third, the milking time of different milking time and milking interval The different milking time will also affect the cow's milk production. The activity of cow mammary glands is frequent at night and there is more milk production and secretion. Therefore, milk production in the morning is higher than other time, and milking before breakfast (5-6 in the morning) is better. Milking intervals also have a certain effect on milk production. Experiments have shown that milking intervals are equal and milk production is greatest, such as milking every 8 hours or milking every 12 hours.
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