Subacute ruminal acidosis and total mixed ration preference in lactating dairy cows1

D. D. Maulfair, K. K. McIntyre, Arlyn Judson Heinrichs

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Subacute ruminal acidosis (SARA) is a condition where the pH of the rumen becomes abnormally acidic because of increased and altered production of volatile fatty acids. The objective of this experiment was to determine how a SARA challenge affects total mixed ration selection in dairy cows. In this study, 8 multiparous, lactating, ruminally cannulated Holstein cows were given a choice between a long-forage-particle-size diet with slow-fermenting starch (LC) and a short-forage-particle-size diet with fast-fermenting starch in a crossover design. Cows were allowed to adapt to this feeding scheme and were then subjected to a rumen challenge to induce a bout of SARA. The rumen challenge successfully decreased rumen pH and altered rumen volatile fatty acid profiles. Daily average rumen pH decreased from 6.02 to 5.77, and average minimum rumen pH decreased from 5.59 to 5.28. In addition, following the rumen challenge, concentrations of acetate, butyrate, and valerate, and acetate-to-propionate ratio increased. In response to the rumen challenge, intake of LC increased from the baseline level of 18.1% of total daily dry matter intake to 38.3% for that day. During the first recovery day after the rumen challenge, LC intake moderated to 28.0% of total daily dry matter intake. On the second recovery day, LC intake returned to baseline levels at 18.6%. These results indicate that cows are able to alter their diet preference for higher physically effective fiber and slower starch fermentability during a bout of SARA and that they can effectively fully recover from this type of SARA within 72. h when appropriate diets are available.

Original languageEnglish (US)
Pages (from-to)6610-6620
Number of pages11
JournalJournal of dairy science
Volume96
Issue number10
DOIs
StatePublished - Oct 1 2013

Fingerprint

ruminal acidosis
total mixed rations
Rumen
Acidosis
rumen
dairies
Starch
Diet
Volatile Fatty Acids
starch
volatile fatty acids
Particle Size
cows
dry matter intake
particle size
Acetates
acetates
diet
forage
Valerates

All Science Journal Classification (ASJC) codes

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

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title = "Subacute ruminal acidosis and total mixed ration preference in lactating dairy cows1",
abstract = "Subacute ruminal acidosis (SARA) is a condition where the pH of the rumen becomes abnormally acidic because of increased and altered production of volatile fatty acids. The objective of this experiment was to determine how a SARA challenge affects total mixed ration selection in dairy cows. In this study, 8 multiparous, lactating, ruminally cannulated Holstein cows were given a choice between a long-forage-particle-size diet with slow-fermenting starch (LC) and a short-forage-particle-size diet with fast-fermenting starch in a crossover design. Cows were allowed to adapt to this feeding scheme and were then subjected to a rumen challenge to induce a bout of SARA. The rumen challenge successfully decreased rumen pH and altered rumen volatile fatty acid profiles. Daily average rumen pH decreased from 6.02 to 5.77, and average minimum rumen pH decreased from 5.59 to 5.28. In addition, following the rumen challenge, concentrations of acetate, butyrate, and valerate, and acetate-to-propionate ratio increased. In response to the rumen challenge, intake of LC increased from the baseline level of 18.1{\%} of total daily dry matter intake to 38.3{\%} for that day. During the first recovery day after the rumen challenge, LC intake moderated to 28.0{\%} of total daily dry matter intake. On the second recovery day, LC intake returned to baseline levels at 18.6{\%}. These results indicate that cows are able to alter their diet preference for higher physically effective fiber and slower starch fermentability during a bout of SARA and that they can effectively fully recover from this type of SARA within 72. h when appropriate diets are available.",
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Subacute ruminal acidosis and total mixed ration preference in lactating dairy cows1. / Maulfair, D. D.; McIntyre, K. K.; Heinrichs, Arlyn Judson.

In: Journal of dairy science, Vol. 96, No. 10, 01.10.2013, p. 6610-6620.

Research output: Contribution to journalArticle

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