Factors affecting serum total cholesterol level of lactating holstein cows.

Abstract

Several factors affecting serum total cholesterol level of lactating Holstein cows were statistically evaluated. One thousand and sixty-three lactating Holstein cows were examined in a period from July, 1982 to April, 1983. Data from each cow were classified according to farms, number of calvings, health condition, daily milk yield and lactation day. Serum total cholesterol was significantly influenced by all these factors, especially daily milk yield and lactation day. However, no significant difference in total cholesterol level was observed between the summer and winter periods when other factors such as the number of calvings, health condition and lactation day were excluded.