Table 1.

Vascular dimensions of bovine lateral saphenous veins biopsied from steers that had grazed pastures of bermudagrass (Cynodon dactylon) or toxic endophyte-infected tall fescue (Lolium arundinaceum) treated or untreated with aminopyralid and metsulfuran-methyl (Chaparral) herbicide¹

Dimension	Bermudagrass	Tall fescue, treated	Tall fescue, untreated	pSEM	P-value
Outside diameter, mm	2.28b	2.25b	2.48a	0.05	0.007
Inside diameter, mm	0.62a	0.44b	0.67a	0.03	< 0.01
Wall thickness, mm	0.83b	0.92a	0.90ab	0.02	0.06

¹Administration of Chaparral (Dow AgroSciences, Indianapolis, IN) to provide 87.1 g/ha of an aminopyralid (2-pyridine carboxylic acid, 4-amino-3,6-dichloro-) and 13.2 g/ha of metsulfuran-methyl (Methyl 2-[[[[(4-methoxy-6-methyl-1,3,5- triazin-2-yl)- amino]carbonyl] amino]sulfonyl]benzoate) results in suppression of seedhead production by tall fescue.

^abValues not sharing like superscripts within a row are different (P < 0.05).