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Effects of lasalocid or monensin supplementation on digestion, ruminal fermentation, blood metabolites, and milk production of lactating dairy cows.
- Source :
-
Journal of dairy science [J Dairy Sci] 2007 Dec; Vol. 90 (12), pp. 5714-25. - Publication Year :
- 2007
-
Abstract
- Six ruminally fistulated midlactating multiparous Holstein cows were used in a double 3 x 3 Latin square design (35-d periods) to study the effects of lasalocid (LAS) and monensin (MON) supplemented at 24 mg/ kg of dry matter on digestion, ruminal fermentation, blood metabolites, and milk production. Cows were blocked according to milk production and fed a red clover silage-based total mixed ration (17.8% crude protein) without supplementation or supplemented with LAS or MON. Daily dry matter intake, milk production, and milk fat and protein concentrations were similar among treatments and averaged 23.5 kg, 36.6 kg, 3.36%, and 3.38%, respectively. Rumen lipogenic:glucogenic volatile fatty acids and NH(3)-N concentration were lower, and apparent digestibility of dry matter, organic matter, crude protein, and gross energy were higher with than without ionophore supplementation. Compared with LAS, MON increased concentrations of plasma urea-N and milk urea-N, and excretion of urinary urea-N and total N. Monensin also decreased N retention and tended to reduce plasma concentration of nonessential AA in comparison with LAS. Both ionophores reduced daily fecal excretion of N by 13 g compared with the control, but MON increased daily losses of urinary N by 36 g compared with LAS. Results from this study suggest that postabsorptive metabolism of N might be altered by the type of ionophore fed.
- Subjects :
- Ammonia metabolism
Animals
Blood Chemical Analysis
Blood Urea Nitrogen
Cattle blood
Cattle physiology
Cross-Over Studies
Dietary Supplements
Fatty Acids, Volatile metabolism
Feces chemistry
Female
Fermentation drug effects
Ionophores administration & dosage
Lactation drug effects
Lactation physiology
Lasalocid administration & dosage
Milk chemistry
Milk metabolism
Monensin administration & dosage
Nitrogen metabolism
Nitrogen urine
Cattle metabolism
Digestion drug effects
Ionophores pharmacology
Lasalocid pharmacology
Monensin pharmacology
Rumen metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1525-3198
- Volume :
- 90
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Journal of dairy science
- Publication Type :
- Academic Journal
- Accession number :
- 18024764
- Full Text :
- https://doi.org/10.3168/jds.2007-0368