Effects of pre-feeding of a corn silage-based supplement on the feed intake, milk production and nitrogen utilization of grazing dairy cows
2005
Mitani, T.(Hokkaido Univ., Sapporo (Japan)) | Takahashi, M. | Ueda, K. | Nakatsuji, H. | Kondo, S.
Four Holstein cows were used to determine the effect of timing of the feeding of a corn silage (CS)-based supplement on the feed intake, milk production and nitrogen utilization of grazing dairy cows. The cows were fed the supplement 2 h before grazing (pre-grazing) or immediately after grazing (post-grazing). Cows were grazed for 5 h per day under a rotational grazing system. There was no difference in the herbage and total feed intake between treatments. The milk protein yield for pre-grazing tended to be higher than that for post-grazing, whereas the milk yield did not differ between treatments. The total nitrogen intake for pre-grazing tended to be higher than that for post-grazing (P = 0.06). There was no difference in the urinary nitrogen output between treatments, whereas the proportion of urinary nitrogen output: total nitrogen intake for pre-grazing tended to be lower than that for post-grazing (P = 0.06). The milk nitrogen output and nitrogen retention for pre-grazing tended to be higher than that for post-grazing (milk nitrogen, P = 0.06; nitrogen retention, P = 0.05). Nitrogen utilization of grazing dairy cows was improved by feeding a CS-based supplement before grazing.
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