Modulation of rumen pH by sodium bicarbonate and a blend of different sources of magnesium oxide in lactating dairy cows submitted to a concentrate challenge

Journal of Dairy Science
Alex BachHajer Khelil-Arfa

Abstract

With the objective of evaluating the potential effects of sodium bicarbonate or a magnesium-based product on rumen pH and milk performance of dairy cattle exposed to a dietary challenge, 30 lactating Holstein cows (648 ± 67 kg of body weight; 44.4 ± 9.9 kg/d of milk yield; 155 ± 75 d in milk) were blocked by parity (9 primiparous and 21 multiparous) and randomly distributed to 3 treatment groups. One group received a total mixed ration (TMR) that acted as a control (CTR), a second group (SB) received the same TMR but with an additional supplementation of 0.8% of sodium bicarbonate, and a third group (MG) received the same TMR as CTR but an additional supplementation of 0.4% of a magnesium-based product (pHix-Up, Timab, Dinard, France). After 1 wk of exposure to this TMR, all 3 rations were supplemented with 1 kg/d of barley, which was then increased 1 kg/wk until reaching 3 kg/d of barley during wk 4 of the study. Every kilogram of barley replaced 1 kg of forage in the diet. Individual feed intake and behavior were monitored using electronic feed bins. Seven cows per treatment were equipped with an intraruminal bolus that recorded pH every 15 min. As the severity of the barley challenge increased, dry matter intake decreased, b...Continue Reading

References

Jul 1, 1989·Journal of Dairy Science·L C SolorzanoB R Schricker
Mar 1, 1985·Journal of Dairy Science·J A RogersK R Cummings
May 1, 1982·Journal of Dairy Science·D M SchaeferJ L White
Feb 17, 1998·Journal of Animal Science·F N OwensD R Gill
Aug 12, 2014·Journal of Dairy Science·T J DeVries, E Chevaux

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Citations

Feb 23, 2020·Journal of Animal Physiology and Animal Nutrition·Kayla P NeiderferTanya F Gressley

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