Effect of monensin and supplemental hay on ruminal 3-methylindole formation in adult cows after abrupt change to lush pasture

Michael J. Potchoiba From the Department of Animal Sciences, Washington State University, Pull- 99164-6310 (Potchoiba, Carlson); Pfizer Inc, Central Research, Eastern Point Rd, Groton, CT 06340. (Nocerini); and USDA-ARS, Plum Island Animal Disease Center, Greenport, NY 11944-0848 (Breeze).

Search for other papers by Michael J. Potchoiba in
Current site
Google Scholar
PubMed
Close
 MS
,
James R. Carlson From the Department of Animal Sciences, Washington State University, Pull- 99164-6310 (Potchoiba, Carlson); Pfizer Inc, Central Research, Eastern Point Rd, Groton, CT 06340. (Nocerini); and USDA-ARS, Plum Island Animal Disease Center, Greenport, NY 11944-0848 (Breeze).

Search for other papers by James R. Carlson in
Current site
Google Scholar
PubMed
Close
 PhD
,
Mark R. Nocerini From the Department of Animal Sciences, Washington State University, Pull- 99164-6310 (Potchoiba, Carlson); Pfizer Inc, Central Research, Eastern Point Rd, Groton, CT 06340. (Nocerini); and USDA-ARS, Plum Island Animal Disease Center, Greenport, NY 11944-0848 (Breeze).

Search for other papers by Mark R. Nocerini in
Current site
Google Scholar
PubMed
Close
 PhD
, and
Roger G. Breeze From the Department of Animal Sciences, Washington State University, Pull- 99164-6310 (Potchoiba, Carlson); Pfizer Inc, Central Research, Eastern Point Rd, Groton, CT 06340. (Nocerini); and USDA-ARS, Plum Island Animal Disease Center, Greenport, NY 11944-0848 (Breeze).

Search for other papers by Roger G. Breeze in
Current site
Google Scholar
PubMed
Close
 BVMS, PhD

Click on author name to view affiliation information

Summary

The effect of feeding monensin, with or without dry hay plus wilted forage, on ruminal formation of 3-methylindole (3MI) was investigated in pastured cattle. Eighty-two cows were allotted to 3 groups. Cows of group-1 served as controls and were given a daily energy supplement (1 kg/head) without monensin for 1 day before and for 7 days after being allowed access to lush pasture. Cows of groups 2 and 3 were given the same daily energy supplement, which also contained monensin (200 mg/kg of supplement). Cows of group 3 also were fed dry hay for 5 days before the start of the study and continued to be given supplemental hay for 4 days after being allowed access to lush pasture containing a layer of wilted forage. Ruminal 3MI and indole concentrations increased on day 1 after all groups were allowed access to lush pasture. By day 7, 3MI concentration in all cows had decreased to pregrazing concentration. Indole concentration did not reach pregrazing concentration until day 10 for cows of groups 1 and 2. Group-3 cows had pregrazing indole concentration on day 7. Ruminal indole concentration did not differ (P > 0.05) between groups 1 and 2. Ruminal indole concentration was lower (P < 0.01) in group-3 cows on all sample collection days, except day 10, compared with that in the other groups. Monensin reduced (P <0.01) 3MI formation on days 1 and 7 in group-2 cows, compared with group-1 cows. Group-3 cows had lower 3MI concentration than did group-1 cows (P <0.01) on days –1, 1, 4, and 7. Monensin, when fed with dry hay and wilted forage, reduced (P <0.01) 3MI formation on days 4 and 7 in group-3 cows, compared with cows that were only given monensin (group 2). Group-3 cows also had lower (P < 0.05) 3MI concentration, compared with group-2 cows on day 1. Results indicated that monensin reduced ruminal formation of 3MI. Feeding dry hay and wilted forage to cattle during the change to lush pasture resulted in further reduction in the amount of 3MI formed by ruminal microorganisms. To maximize the effectiveness of monensin in reducing 3MI formation, dry hay plus wilted forage should be fed to pastured cattle for at least 4 days after they are allowed access to lush pasture.

Summary

The effect of feeding monensin, with or without dry hay plus wilted forage, on ruminal formation of 3-methylindole (3MI) was investigated in pastured cattle. Eighty-two cows were allotted to 3 groups. Cows of group-1 served as controls and were given a daily energy supplement (1 kg/head) without monensin for 1 day before and for 7 days after being allowed access to lush pasture. Cows of groups 2 and 3 were given the same daily energy supplement, which also contained monensin (200 mg/kg of supplement). Cows of group 3 also were fed dry hay for 5 days before the start of the study and continued to be given supplemental hay for 4 days after being allowed access to lush pasture containing a layer of wilted forage. Ruminal 3MI and indole concentrations increased on day 1 after all groups were allowed access to lush pasture. By day 7, 3MI concentration in all cows had decreased to pregrazing concentration. Indole concentration did not reach pregrazing concentration until day 10 for cows of groups 1 and 2. Group-3 cows had pregrazing indole concentration on day 7. Ruminal indole concentration did not differ (P > 0.05) between groups 1 and 2. Ruminal indole concentration was lower (P < 0.01) in group-3 cows on all sample collection days, except day 10, compared with that in the other groups. Monensin reduced (P <0.01) 3MI formation on days 1 and 7 in group-2 cows, compared with group-1 cows. Group-3 cows had lower 3MI concentration than did group-1 cows (P <0.01) on days –1, 1, 4, and 7. Monensin, when fed with dry hay and wilted forage, reduced (P <0.01) 3MI formation on days 4 and 7 in group-3 cows, compared with cows that were only given monensin (group 2). Group-3 cows also had lower (P < 0.05) 3MI concentration, compared with group-2 cows on day 1. Results indicated that monensin reduced ruminal formation of 3MI. Feeding dry hay and wilted forage to cattle during the change to lush pasture resulted in further reduction in the amount of 3MI formed by ruminal microorganisms. To maximize the effectiveness of monensin in reducing 3MI formation, dry hay plus wilted forage should be fed to pastured cattle for at least 4 days after they are allowed access to lush pasture.

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 50 50 12
PDF Downloads 29 29 2
Advertisement