Why are dairy cows not able to cope with the subacute rumen acidosis?

A. M. Brzozowska , K. Słoniewski , J. Oprządek , P. Sobiech , Zygmunt Kowalski

Abstract

One of the largest challenges for the dairy industry is to provide cows with a diet which is highly energetic but does not negatively affect their rumens’ functions. In highly productive dairy cows, feeding diets rich in readily fermentable carbohydrates provides energy precursors needed for maximum milk production, but simultaneously decreases ruminal pH, leading to a widespread prevalence of subacute ruminal acidosis. Maximizing milk production without triggering rumen acidosis still challenges dairy farmers, who try to prevent prolonged bouts of low ruminal pH mainly by proper nutrition and management practices. The animals try to avoid overeating fermentable feeds, as it causes negative consequences by disturbing digestive processes. The results of several experiments show that ruminants, including sheep and beef cattle, are able to modify some aspects of feeding behaviour in order to adjust nutrient intake to their needs and simultaneously prevent physiological disturbances. Particularly, such changes (e.g., increased preference for fibrous feeds, reduced intake of concentrates) were observed in animals, which were trying to prevent the excessive drop of rumen fluid pH. Thanks to a specific mechanism called “the postingestive feedback”, animals should be able to work out such a balance in intake, so they do not suffer either from hunger or from negative effects of over-ingesting the fermentable carbohydrates. This way, an acidosis should not be a frequent problem in ruminants. However, prolonged periods of excessively decreased rumen pH are still a concern in dairy cows. It raises a question, why the regulation of feed intake by postingestive feedback does not help to maintain stable rumen environment in dairy cows?
Author A. M. Brzozowska
A. M. Brzozowska,,
-
, K. Słoniewski
K. Słoniewski,,
-
, J. Oprządek
J. Oprządek,,
-
, P. Sobiech
P. Sobiech,,
-
, Zygmunt Kowalski (DoAS / DoANaFS)
Zygmunt Kowalski,,
- Department of Animal Nutrition and Feed Science
Journal seriesPolish Journal of Veterinary Sciences, ISSN 1505-1773, (A 20 pkt)
Issue year2013
Vol16
No4
Pages813-821
Publication size in sheets0.5
Keywords in Englishfeeding behaviour, postingestive feedback, acidosis, dairy cows, rumen
ASJC Classification3400 General Veterinary; 2700 General Medicine
DOIDOI:10.2478/pjvs-2013-0116
URL http://www.uwm.edu.pl/pjvsci/4_2013/28.pdf
Internal identifierWHiBZ/2013/69
Languageen angielski
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Why are dairy cows not able to cope with the subacute rumen acidosis? 66,86 KB
Score (nominal)20
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 0.582; WoS Impact Factor: 2013 = 0.712 (2) - 2013=0.626 (5)
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