N.Y. Comp. Codes R. & Regs. tit. 1, § 2.9 – Milking barn, stable or parlor—construction and maintenance—Item 2r.

(a) A milking barn, stable or parlor shall be provided on all dairy farms in which the milking herd shall be housed during milking time operations. The areas used for milking purposes shall meet the following requirements:
1. (1) Floors, feed troughs (and gutters if present) shall be constructed of good quality concrete or equally impervious material. Floors shall be constructed so as to be easily cleaned (brushed surfaces permitted) and shall be graded to drain.
2. (2) Walls and ceilings are finished with wood, tile, smooth-surfaced concrete, cement plaster, brick or other equivalent materials with light-colored surfaces. Walls, partitions, doors, shelves, windows and ceilings shall be kept in good repair, and surfaces shall be refinished whenever wear or discoloration is evident. Whenever feed is stored overhead, ceilings shall be constructed to prevent the sifting of chaff and dust into the milking barn, stable or parlor. If a hay opening is provided from the loft into the milking portion of the barn, such opening shall be provided with a dust-tight door which shall be kept closed during milking operations.
3. (3) Separate pens shall be provided for bulls, horses and calves. These areas shall be separated by tight partitions from the milking area. Such portion of the barn not so separated shall comply with all items of this section. In addition, a curbing shall be provided to separate horses, bulls and calves from the milking area. The curbing shall effectively eliminate the flow of manure and urine from such areas.
4. (4) The milking barn is provided with sufficient light to insure that all surfaces and particularly the working areas will be plainly visible. The equivalent of at least 10 foot-candles of light in all working areas shall be provided; notwithstanding the foregoing, a dairy farm which produces milk for non-Grade A shall be exempt from the 10 foot-candles requirement of this paragraph.
5. (5) Air circulation is sufficient to minimize odors and to prevent condensation upon walls and ceilings.
6. (6) Overcrowding is not evidenced by the presence of calves, cows or other barnyard animals in walks or feed alleys. Inadequate ventilation and excessive odors may also be evidence of an overcrowded barn.
7. (7) A dust-tight partition, provided with doors that are kept closed except when in actual use, shall separate the milking portion of the barn from any feed room or silo in which feed is ground or mixed, or in which sweet feed is stored. Feed may be stored in the milking portion of the barn only in such manner as will not increase the dust content of the air, attract flies or interfere with cleaning of the floor (as in covered, dust-tight boxes or bins). Open feed dollies or carts may be used for distributing the feed, but not storing feed, in the milking barn.
(b) When conditions warrant, the commissioner may approve a barn without four walls extending from floor to roof, or a shed-type barn provided the requirement of section 2.10 of this Part (Item 3r) prohibiting animals and fowl entering the barn is satisifed. Cattle-housing areas (stables without stanchions, such as loose-housing stables, pen stables, resting barns, free-stall barns, holding barns, loafing sheds, wandering sheds) may be of shed-type construction, provided no milking is conducted therein. They are classified as part of the cowyard under section 2.11 of this Part (Item 4r).