The effects on ruminal pH and serum haptoglobin after feeding a grain-based supplement to grazing dairy cows as a partial mixed ration or during milking.

Autor: Coombe JE; Faculty of Veterinary Science, University of Melbourne, Werribee, Vic. 3030, Australia. Electronic address: coombejoanne@gmail.com., Pyman MF; Faculty of Veterinary Science, University of Melbourne, Werribee, Vic. 3030, Australia., Mansell PD; Faculty of Veterinary Science, University of Melbourne, Werribee, Vic. 3030, Australia., Auldist MJ; Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Vic. 3821, Australia., Anderson GA; Faculty of Veterinary Science, University of Melbourne, Werribee, Vic. 3030, Australia., Wales WJ; Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Vic. 3821, Australia., Conley MJ; Faculty of Veterinary Science, University of Melbourne, Werribee, Vic. 3030, Australia; Animal Welfare Science Centre, University of Melbourne, Parkville, Vic. 3010, Australia., Manos S; Information Technology Services, University of Melbourne, Parkville, Vic. 3010, Australia., Hannah M; Farming Systems Research Division, Department of Environment and Primary Industries, Ellinbank, Vic. 3821, Australia., Fisher AD; Faculty of Veterinary Science, University of Melbourne, Werribee, Vic. 3030, Australia; Animal Welfare Science Centre, University of Melbourne, Parkville, Vic. 3010, Australia.
Jazyk: angličtina
Zdroj: Veterinary journal (London, England : 1997) [Vet J] 2015 Apr; Vol. 204 (1), pp. 105-9. Date of Electronic Publication: 2015 Feb 11.
DOI: 10.1016/j.tvjl.2015.02.005
Abstrakt: Ruminal pH and serum concentrations of haptoglobin (Hp) were measured in order to assess the risk of subacute ruminal acidosis (SARA) in grazing cows offered rolled wheat grain twice daily in the dairy at milking (Control group; n= 64), or as a partial mixed ration (PMR group; n= 64) on a feedpad. Cows were allocated various levels of the supplement (8, 10, 12 or 14 kg dry matter/day). Ruminal pH was measured in 16 rumen-fistulated cows (eight PMR and eight Control group cows), using indwelling pH meters, recording every 10 min for 14 days. Serum Hp was analysed in samples collected from 125 cows. No differences in ruminal pH or serum Hp concentration were found between treatment groups, or levels of feeding. It was concluded that, using ruminal pH patterns and Hp as markers of SARA at the feeding levels used in this study, there were no differences between grazing cows fed the supplement either as grain in the dairy or as a PMR fed on a feedpad.
(Copyright © 2015 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: