Varying degradation rates of total nonstructural carbohydrates: effects on ruminal fermentation, blood metabolites, and milk production and composition in high producing Holstein cows

Journal of Dairy Science
T LykosD Casper

Abstract

Twelve multiparous Holstein cows (6 ruminally cannulated and 6 intact) at 56 to 77 d of lactation were used in an experiment with a 3 x 6 Latin square design. Cows were fed three total mixed rations that varied in degradation rates of total nonstructural carbohydrates (6.04, 6.98, and 7.94%/h). No interactions between treatment and square were detected. Higher ruminal degradation rates of dietary total nonstructural carbohydrates increased the nonammonia N (NAN) pool of the liquid fraction but did not alter the dry matter or volume of fractional pools, microbial NAN pools, or microbial composition. Treatment did not affect dry matter intake, total concentrations of volatile fatty acids, or fiber digestibility. As ruminal degradation rates of total nonstructural carbohydrates increased, the following effects were observed: 1) the turnover rates of solids increased linearly; 2) ruminal NH3 N concentrations and degradabilities of organic matter and N decreased, but propionate concentrations, bacterial efficiency, and total NAN flows tended to increase; 3) blood glucose and insulin concentrations were not affected, but blood urea N and nonesterified fatty acids were decreased; 4) intestinal and total tract digestibilities of organi...Continue Reading

References

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Citations

May 3, 2011·Polish Journal of Veterinary Sciences·R MikułaE Pruszyńska Oszmałek
Mar 11, 2006·Journal of Dairy Science·J L FirkinsN R St-Pierre
Apr 17, 2013·Journal of Dairy Science·M D HaniganP Gregorini
Dec 14, 2004·Journal of Dairy Science·H G BatemanM R Murphy
Aug 9, 2003·Journal of Dairy Science·P J Kononoff, A J Heinrichs
Apr 22, 2003·Journal of Dairy Science·J E DelahoyL A Holden
Nov 9, 2001·Journal of Dairy Science·E RabeloR R Grummer
Nov 9, 2001·Journal of Dairy Science·A J Kauffman, N R St-Pierre
Sep 10, 1999·Journal of Dairy Science·H M DannD E Putnam
Aug 26, 2004·Journal of Dairy Science·D J R CherneyL E Chase
Apr 24, 2010·Journal of Dairy Science·J J CastroR B Eggleston
May 14, 2003·Journal of Dairy Science·P J Kononoff, A J Heinrichs
Nov 28, 2020·The Journal of Dairy Research·Luís Carlos Vinhas ÍtavoGeraldo Tadeu Dos Santos
Nov 22, 2020·Animals : an Open Access Journal From MDPI·Robert MikułaWłodzimierz Nowak
May 15, 2021·Journal of Dairy Science·M D HaniganP Kononoff

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