Feeding cod liver oil and other highly unsaturated oils markedly reduces milk fat percentage but not production. Also causes a reduction in b -hydroxybutyric acid used for fat synthesis. There is a gluconeogenic response to increased propionate production and a decline in blood lipids available for milk fat synthesis. Reduces total milk production and SNF portion of milk. C. Stage of lactation and persistency 1.
Colostrum is the first drawn milk from the mammary gland after parturition.
In composition, colostrum is higher in total solids, protein and ash than normal milk. Usually, a period of 3-5 days postpartum is needed before milk returns to normal composition. The high protein content and solids content is due largely to elevated level of gamma globulin which contains antibodies against various diseases. 3.1 Fat 6.7 4.0 Lactose 2.7 5.0 2. Pregnancy causes a marked decrease in persistency compared to open cows.