Factors Affecting Milk Yield.
In healthy conditions, milk yield in cattle increases within the first six weeks of lactation and then gradually begins to decline. This fall in the actual milk yield occurs due to several factors such as breed, parity, management, etc. But the most important reason, which leads to lower milk yield, is reproduction-related issues like frequent breeding, the season of calving, prolonged calving period, and mineral deficiency.
1. Breed
In India, there is a broad range of cow and buffalo breeds available. The nutritional content in the milk produced by them varies within the different dairy breeds.
2. Dry Period
The dry period for any dairy cow is usually two months, i.e., 60 days. It involves both far-off and close-up periods. The close-up period in the cattle begins three weeks before the expected due date for calving. This rest interval is required to boost the milk yield in the subsequent lactation. If cattle undergo a dry period of less than 40-60 days, the milk production gets decreased by 25-40%. The assumption that milk production will increase with a long dry period (more than 60 days) is also incorrect because a prolonged dry period does not significantly increase milk yield.
3. Age and Weight During Calving
The milk yield in the cattle increases with the advancing lactation. Due to this, the cattle's body weight increases, which results in a better and larger digestive system and mammary glands for milk secretion. Another reason for the enhancement in milk production with age is repetitive pregnancy and lactation. The data available on milk production with cows indicates that 20% of the increase in milk yield is due to age, and 80% of the effect is due to repetitive pregnancy and lactation. Repetitive pregnancy and lactation may result in an increment of 30% in milk production.
4. Lactation Number and Pregnancy
Milk production rises with the rise in the number of lactations. Maximum growth in milk production appears in the 4th to 5th lactation. Repetitive pregnancies are helpful, but they have an unusual inhibitory effect on milk yield. Later around the fifth month of pregnancy, a drop occurs in the milk yield of cows. Moreover, milk yield seems to be 20% less by the eighth month of pregnancy than any non-pregnant cow.
5. Season of Calving
Milk production rises with the rise in the number of lactations. Maximum growth in milk production appears in the 4th to 5th lactation. Repetitive pregnancies are helpful, but they have an unusual inhibitory effect on milk yield. Later around the fifth month of pregnancy, a drop occurs in the milk yield of cows. Moreover, milk yield seems to be 20% less by the eighth month of pregnancy than any non-pregnant cow.
6. Health, Diseases, or Mineral Deficiencies
It is true that “health is wealth” because the cattle's milk yield will increase only when they are healthy. But diseases like mastitis reduce the ability of their secretory tissue and make them weak. It directly affects the daily milk yield of the farm.
Mineral deficiencies are also one of the significant causes of lower milk yield in cattle. Some critical insufficiencies can lead to sudden death in cattle.