The context seems to suggest a transitional body which standing committee would fit.

The translation problem with 'filière' is that English has not pressed a word into service to convey quite the same connotation. Translators fall back on 'sector' and 'industry' faute de mieux. But neither of these necessarily connotes the French meaning of a 'Suite d'opérations ou d'éléments coordonnés en vue d'un résultat.'

Here, you have two 'sectors' in a chain: the producers of feeder calves supply animals to the producers of slaughter steers (twice the size), which then send them on to the slaughterhouses and meatpackers. At best, these two sectors are only part of an industry, and there is no particular reason to believe this committee will be looking out for the sectors downstream from them, i.e. the rest of the meat industry.

Alternatively, you could do worse than 'two-sector' committee here. :-)