Studies On The Total Mixed Ration Of Dairy Cows In Southern Of China

The trial selected a single factorial design to determine the effects of (1) feeding a total mixed ration (TMR) compared with separate ingredients (SI) at the same concentrate to forage ratios(50:50) for the ration, and (2) concentrate to forage ratios for TMR (60:40, 55:45, 50:50, 45:55, and 40:60) in the diet on feeding behavior, milk performance, apparent digestibility of nutrients of total tract, and blood metabolism in the southern of China by taking typical feed local. 36 lactating Holstein cows were used in the trial and divided into 6 treatments (n=6) according to milk yield, calving date, and lactation. The concentrate to forage ratios for the ration SI, T1, T2, T3, T4, and T5 were 50:50,60:40, 55:45, 50:50,45:55, and 40:60. The results indicated that:(1) Feeding behavior: Dry matter intake (P<0.05), and chewing activity (P<0.01) significantly decreased as C:F increased in total mixed ration; under the same ratio of concentrate to forage (50:50), dry matter intake, and chewing activity have no significant difference in the two feeding methods.(2) Milk performance: The milk yields, 4% FCM yields, milk lactose yields, milk solid yields, and milk solids-not-fat yields significantly increased as C:F increased in total mixed ration (P<0.05); In the two feeding methods, the 4% FCM, the milk fat content, milk fat yields, milk lactose yields, and milk solid yields of dairy cows in T3 group significantly increased than SI group (P<0.05) regardless of the same ratio of concentrate to forage (50:50).(3) Apparent digestibility of nutrients of total tract: In TMR, apparent digestibility of nutrients of total tract of dairy cows (besides ether extract) significantly increased (PO.05) as C:F increased; under the same ratio of concentrate to forage (50:50), the apparent digestibility of nutrients of total tract have no significant difference in the two feeding methods (P>0.05).(4) Blood metabolism: In TMR, blood metabolism was no significant difference (P>0.05) as C:F increased; under the same ratio of concentrate to forage (50:50), the blood metabolism has no significant difference in the two feeding methods (P>0.05).