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Effects of Feed Intake and Sodium Bicarbonate on Milk Production and Concentrations of Hormones and Metabolites in Plasma of Cows¹

Deparment of Animal Sciences, University of Illinois, Urbana 61801

S. N. McCutcheon⁵ and D. E. Bauman

Department of Animal Science, Cornell University, Ithaca, NY 14853

⁴ Reprint requests.

ABSTRACT

Eight Holstein cows were used to investigate the effects of DM intake and sodium bicarbonate on lactational performance and concentrations of hormones and metabolites in plasma. Cows were fed a diet with or without 1.0% sodium bicarbonate (dry matter basis) in a switchback design. Four cows were fed ad libitum and four cows were fed approximately 80% of their recommended nutrient requirements by restriction of DM intake throughout the three 21-d periods. Supplementing the diet with sodium bicarbonate increased DM intake of cows fed ad libitum. There was a feed intake by sodium bicarbonate interaction for production of 4% FCM. This interaction may be explained by the difference in DM intake of cows fed ad libitum or restricted amounts of feed and supplemented with sodium bicarbonate. Cows fed restricted amounts of feed had lower milk, milk fat, milk protein, milk SNF, and milk energy yields. Restriction of feed intake increased plasma concentrations of somatotropin and nonesterified fatty acids but decreased concentrations of insulin, triidothyronine, thyroxine, glucagon, and prolactin. In contrast, feeding supplemental sodium bicarbonate did not affect concentrations of hormones or metabolites in plasma at either feed intake.

¹ Supported in part by the University of Illinois Agricultural Experiment Station, Cornell University Agricultural Experiment Station, and Church and Dwight Company, Inc.

² Monsanto Agricultural Co., BB2K, 700 Chesterfield Village Parkway, St. Louis, MO 63198.

³ Department of Animal Science, Cornell University, Ithaca, NY.

⁵ On leave from Department of Animal Science, Massey University, Palmerston North, New Zealand.

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