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Journal of Dairy Science Vol. 83 No. 8 1813-1828
© 2000 by American Dairy Science Association ®
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Effects of Inclusion of a Blended Protein Product in 35 Dairy Herds in Five Regions of the Country

J. D. Ferguson 1, D. K. Beede 2, R. D. Shaver 3, C. E. Polan 4, J. T. Huber 5, and P. T. Chandler 6

1 Department of Clinical Studies, New Bolton Center, University of Pennsylvania School of Veterinary Medicine, 382 West Street Road, Kennett Square, PA 19348
2 Department of Animal Science, Michigan State University, East Lansing 48824-1225
3 Department of Dairy Science, University of Wisconsin, Madison 53706
4 Department of Dairy Science, Virginia Tech University, Blacksburg 24061-0315
5 Department of Animal Science, University of Arizona, Tucson 85721,
6 #P.O. Box 87, Dresden, TN 38225

We assessed the change in milk production in 35 dairy herds located in eight states when a blended animal-marine protein product was included in diets at 2 (22 herds) to 4% (13 herds) of dry matter. Average 305-d production across herds was 8844.1 kg (SEM = 153.7 kg) of milk, with a range of 6876.9 to 11,293.2 kg. The mean days in milk for all herds at initiation of the trial was 118.8 d (SEM = 3.7, herd mean range of 68.8 to 160.0 d), and the average daily milk production was 32.6 kg (SEM = 0.6 kg, range 24.2 to 39.6 kg). The animal-marine protein blend was included in herd rations for 30 d, beginning immediately after a DHI herd test month and ending immediately after the next DHI sample test. Cow milk records were collected for 1 to 2 mo before the protein blend was included and for 2 to 3 mo after the protein was removed. Sample days were assigned a dummy variable to indicate months off or on the animal-marine protein blend.

A total of 33,190 milk records from 7135 cows were analyzed. The numbers within herd ranged from 35 to 2012 cows. Of the 35 herds, 19 were classed as having increased milk yield, 12 herds as having no change, and 4 herds as having decreased milk yield when the animal-marine protein blend was included in the diet. The population mean for change in milk yield with the inclusion of the animal-marine protein blend was 1.24 kg/d of milk (SEM = 0.05 kg). There was no significant effect of parity on mean response. Milk protein content was not influenced by animal-marine protein blend inclusion. Fat content was lower for the month on which the animal-marine protein blend was fed (3.51%) compared with the month prior (3.63%) and the month after (3.70%), respectively (SEM = 0.032). Stage of lactation influenced the method for calculating the production response and the actual response to the animal-marine protein blend.

Key Words: protein • milk production • dairy cattle

Submitted on August 5, 1999
Accepted on January 31, 2000




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I. R. Ipharraguerre and J. H. Clark
Varying Protein and Starch in the Diet of Dairy Cows. II. Effects on Performance and Nitrogen Utilization for Milk Production
J Dairy Sci, July 1, 2005; 88(7): 2556 - 2570.
[Abstract] [Full Text] [PDF]


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