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Journal of Dairy Science Vol. 76 No. 5 1365-1374
© 1993 by American Dairy Science Association ®
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Milk Yield, Intake, and Blood Traits of Lactating Cows Fed Grass Silage Conserved Under Different Harvesting Methods

Hélène V. Petit 1, G. F. Tremblay 2, P. Savoie 3, D. Tremblay 4, and J. M. Wauthy 5

1 Experimental Farm Agriculture Canada La Pocatière, QC, Canada G0R 1Z0
2 Experimental Farm Agriculture Canada Normandin, QC, Canada G0W 2E0
3 Research Station Agriculture Canada Ste-Foy, QC, Canada G1V 2J3
4 Université Laval Département de géenie rural Ste-Foy, QC, Canada G1K 7P4
5 Experimental Farm Agriculture Canada Nomandin, QC, Canada G0W 2E0

Thirty-two Holstein cows (8 primiparous) were assigned to negative control or to one of three treatments to assess three forage harvesting and conservation techniques. Forage was harvested as low moisture silage by either a cylinder-type forage harvester, a self-loading forage harvester, or a round baler. Treatment diets were fed from wk 4 to 15 of lactation and consisted of silages harvested by the respective methods supplemented with concentrate at 1.1 % of BW. Unsupplemented silage harvested by a cylinder-type forage harvester was used as a control. Daily DMI was higher for cows fed supplemented heap silage cut with either a cylinder-type forage harvester (23.7 kg) or a self-loading forage harvester (22.6 kg) than for cows fed the control (20.0 kg) or supplemented round bale silage (20.1 kg). Milk yield was highest for cows fed supplemented heap silage cut with a cylinder-type forage harvester (26.6 kg/l d) and lower for those fed supplemented heap silage cut with a self-loading forage harvester (22.7 kg/d) or the control (20.8 kg/d). Milk composition and digestibilities of DM, N, ADF, and energy were similar among treatments. Postfeeding NEFA concentration decreased more for control cows than for those fed supplemented silage, which was related to greater BW loss. The high milk yield for cows fed supplemented heap silage cut with a cylinder-type forage harvester could be related to a high DMI and low BW gain.

Key Words: dairy • silage • digestibility • harvest

Submitted on August 12, 1992
Accepted on December 14, 1992




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