| Popis: |
Summary From the data presented here it would appear that: 1.High production at the beginning of the lactation period is not the only factor of importance in determining the production of a cow. 2.Persistency of production, coupled with high initial production, will lead to good production. 3.There is a general downward trend in milk and butterfat production from the beginning to the end of the lactation and with this would appear to go for the first month or two a decrease and later an increase in the fat content of the milk. This may be generally attributed to the fact that changes in the yield of fat, follow, but lag behind, the changes in the yield of milk. 4.Holsteins and Ayrshires showed the highest milk production in the second month and all others in the first month of the lactation. 5.In the case of the Jerseys the percentage of fat in the milk rises from the beginning to the end of the lactation period, while the Guernseys show a drop in the second month only. In both breeds the average fat percentage for the year is greater than the average for the first month. 6.The Ayrshires and Holsteins produce milk of decreasing fat content for some time after freshening and the average fat content of the milk for the year is less than for the first month. |
