The accuracy of diagnosis of subacute rumen acidosis (SARA) with a single measurement of the ruminal pH remains contradictory. To clarify this aspect, a large assessment of rumen, faecal and blood parameters was performed in several herds characterised by diets rich in non-structural carbohydrates. Rumen fluid was collected by rumenocentesis 6 h after feeding from 114 dairy cows (half 30-90 and half 150-250 days in milk) from 10 herds. In the same day, blood and faecal samples were collected and milk yield was recorded. The herds were ex-post classified as healthy (CTR n ≤ 6) or as at risk for SARA (n ≤ 4), based on ruminal pH. SARA versus CTR herds had lower rumen pH (5.67 vs 5.97 P < 0.01) and higher concentration of VFA, with lower acetate (P < 0.01) and higher propionate and valerate (P < 0.05) proportions. Moreover, the faecal DM was lower (P < 0.05), whereas the milk yield was higher with a lower concentration of fat (P < 0.05). At blood level, no significant differences were observed between the groups on positive acute-phase proteins, whereas SARA herds showed higher concentrations of paraoxonase and Ca and lower of cholesterol, total proteins, nitrates, Na and Zn (P < 0.01). Therefore, SARA herds did not show any evident symptom of ruminal disorder or systemic inflammation. On the contrary, these herds had a higher milk yield and a better inflammometabolic profile. These data confirm the difficulties to diagnose the SARA by a single measurement of ruminal pH in commercial herds and suggest the need of more specific indices to identify herds at risk. © CSIRO 2014.

Trevisi, E., Minuti, A., Cogrossi, S., Grossi, P., Ahmed, S., Bani, P., Can a single rumen sample really diagnose SARA in commercial farms?, <<ANIMAL PRODUCTION SCIENCE>>, 2014; (n/a): 1268-1272. [doi:10.1071/AN14269] [http://hdl.handle.net/10807/64426]

Can a single rumen sample really diagnose SARA in commercial farms?

Trevisi, Erminio;Minuti, Andrea;Cogrossi, Simone;Grossi, Paolo;Ahmed, Sadek;Bani, Paolo
2014

Abstract

The accuracy of diagnosis of subacute rumen acidosis (SARA) with a single measurement of the ruminal pH remains contradictory. To clarify this aspect, a large assessment of rumen, faecal and blood parameters was performed in several herds characterised by diets rich in non-structural carbohydrates. Rumen fluid was collected by rumenocentesis 6 h after feeding from 114 dairy cows (half 30-90 and half 150-250 days in milk) from 10 herds. In the same day, blood and faecal samples were collected and milk yield was recorded. The herds were ex-post classified as healthy (CTR n ≤ 6) or as at risk for SARA (n ≤ 4), based on ruminal pH. SARA versus CTR herds had lower rumen pH (5.67 vs 5.97 P < 0.01) and higher concentration of VFA, with lower acetate (P < 0.01) and higher propionate and valerate (P < 0.05) proportions. Moreover, the faecal DM was lower (P < 0.05), whereas the milk yield was higher with a lower concentration of fat (P < 0.05). At blood level, no significant differences were observed between the groups on positive acute-phase proteins, whereas SARA herds showed higher concentrations of paraoxonase and Ca and lower of cholesterol, total proteins, nitrates, Na and Zn (P < 0.01). Therefore, SARA herds did not show any evident symptom of ruminal disorder or systemic inflammation. On the contrary, these herds had a higher milk yield and a better inflammometabolic profile. These data confirm the difficulties to diagnose the SARA by a single measurement of ruminal pH in commercial herds and suggest the need of more specific indices to identify herds at risk. © CSIRO 2014.
Inglese
Trevisi, E., Minuti, A., Cogrossi, S., Grossi, P., Ahmed, S., Bani, P., Can a single rumen sample really diagnose SARA in commercial farms?, <<ANIMAL PRODUCTION SCIENCE>>, 2014; (n/a): 1268-1272. [doi:10.1071/AN14269] [http://hdl.handle.net/10807/64426]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/64426
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