Grass is cannot be a 'supplement' to the natural diet (= grass), so 'suplementadas' must refer to supplements over and above natural grazing; IOW, "omitindo-se "suplementadas?" --> No.

Supplemental soybean oil or corn for beef heifers grazing summer ...jas.fass.org/content/79/10/2704.full.pdf - Traducir esta página
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mine the effects of soybean oil or corn supplementation ... forages, but consideration should be given to reduced ... Supplemental soybean oil or corn for beef heifers grazing summer ...jas.fass.org/content/79/10/2704.full.pdf - Traducir esta página
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mine the effects of soybean oil or corn supplementation ... forages, but consideration should be given to reduced ... supplements provided to heifers grazing ...
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Variability in Voluntary Intake of Loose Mineral Mix Supplements ...era.deedi.qld.gov.au/.../DixonVariabilityHeifers-... - Traducir esta página
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Supplements by Grazing Heifers. R. M. Dixon, I Porch and A. T. White. Qld Beef Industry Institute, Swan's Lagoon, Millaroo, Ayr 4807, Australia ...
...
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Variability in Voluntary Intake of Loose Mineral Mix Supplements ...era.deedi.qld.gov.au/.../DixonVariabilityHeifers-... - Traducir esta página
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Supplements by Grazing Heifers. R. M. Dixon, I Porch and A. T. White. Qld Beef Industry Institute, Swan's Lagoon, Millaroo, Ayr 4807, Australia ...

sugestão

Many examples of 'ingestive response':

www.ncbi.nlm.nih.gov/pubmed/12857022
by F Halaweish - 2003 - Cited by 9 - Related articles
Rodent and ruminant ingestive response to flavonoids in Euphorbia esula ..

This is my interpretation. They are already receiving supplements, and the question now is what happens when they are also allowed to graze. There may be a shorter way of saying this, but this solution, is, I think, accurate. You want to make it clear that they are already on supplements and that pasture feeding is the new component.

Another way to think of it is: 'ingestive behavior of heifers receiving supplements when they are also allowed to graze'

including grazing