Effects of dietary supplementation on nutrient digestion and the milk yield of intensively grazed lactating dairy cows

Journal of Dairy Science
J M Jones-EndsleyT R Johnson

Abstract

Fourteen midlactation Holstein cows were used in an 80-d study to examine supplementation strategies during intensive rotational grazing. Factors examined were the concentration of protein in the supplement [12 or 16% crude protein (CP) on a dry matter basis] and the amount of supplement offered (6.4 or 9.6 kg/d per cow). The supplement was offered in equal portions three times daily after milking. Pasture, composed of alfalfa (Medicago sativa) and orchardgrass (Dactylis glomerata), was divided into 27 0.16-ha paddocks that were grazed for 12 to 24 h. Intake of forage tended to increase as CP in the supplement increased but was unaffected by the amount of supplement offered. Intakes of organic matter and dry matter and the digestion of these nutrients in the total tract increased as CP in the supplement increased and as the amount of supplement increased. Ruminal pH and concentrations of volatile fatty acids were unaffected by treatments, but concentrations of NH3 N increased as CP in the supplement increased. An increase in CP resulted in a greater intake and flow of total N to the duodenum. The flow of microbial N to the duodenum and the efficiency of microbial protein synthesis were unaffected by treatment. Flows of total am...Continue Reading

References

Mar 1, 1992·Journal of Dairy Science·H V Petit, G F Tremblay
Jul 1, 1985·Journal of Dairy Science·H H Van HornD K Beede
Sep 1, 1974·The British Journal of Nutrition·L D Satter, L L Slyter
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Aug 1, 1994·Journal of Dairy Science·L A HoldenS L Fales
Jan 1, 1992·Applied and Environmental Microbiology·D E Wachenheim, J A Patterson

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Citations

Jun 28, 2002·Journal of Dairy Science·E S Kolver, M J de Veth
Jun 28, 2002·Journal of Dairy Science·A H FredeenR C Martin
Mar 5, 2003·Journal of Dairy Science·F BargoJ E Delahoy
Sep 26, 2003·The Proceedings of the Nutrition Society·Eric S Kolver
Nov 11, 2019·Journal of Dairy Science·A J FlemingM D Hanigan

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