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Methionine Hydroxy Analog or Sulfate Supplementation for High Producing Dairy Cows¹

Department of Animal Sciences, Washington State University, Pullman 99163

ABSTRACT

Thirty-six Holstein cows were assigned to three rations. Control rations were supplemented with 25 g/day methionine analog or 17.5 g/day sodium sulfate. Assignment was by actual or estimated mature equivalent production of the previous lactation. Individual intakes and production were summarized for 18 wk during which rations consisted of 48% concentrate, 42% alfalfa hay cubes, and 10% alfalfa-grass silage. Full lactation records from Dairy Herd Improvement were compared. Average dry matter intake equaled 2.95% of body weight during the feeding-lactation trial. Production averaged 3896 kg milk, 3.3% fat, or 4081 kg adjusted to 3.5% fat, mature equivalent basis. Production for the full lactation averaged 7480 kg milk, 3.3% fat, or 8047 kg adjusted. No differences were significant among treatments for feed intake, adjusted production, or percent fat. High producers did not respond differently from lower producers. Analysis of medium and long chain fatty acids of the milk triglyceride fraction did not demonstrate treatment differences. However, there were changes in fatty acid composition between pre-peak samples and milk samples taken as lactation progressed.

¹ Scientific paper no. 4229, College of Agriculture Research Center, Washington State University, Pullman. Project 0126. This work was supported in part by E. I. DuPont De Nemours, Wilmington, DE.

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