Clean Milk Production - Veterinary Food Hygiene

Vocabulary practice flashcards covering clean milk characteristics, sources of contamination, milking-house design, water standards, cooling methods, and heat treatment based on Dr. Dina A. B. Awad's lecture on Veterinary Food Hygiene.

Clean Milk

Milk characterized by normal physical and chemical properties, low bacterial count, freedom from pathogenic microorganisms and contaminants, high keeping quality, and high nutritive value.

Three-Part Clean Milk Strategy

The systematic control protocol consisting of preventing high bacterial count at the source, preventing microbial growth by rapid cooling to $4^\circ\text{C}$, and destroying microorganisms through heat treatment.

Foremilk

The first stream of milk drawn from the teat, which must be discarded prior to milking to prevent contamination.

Antibiotic Withholding Period

The mandatory duration of $72\text{--}96\text{ hours}$ during which milk from antibiotic-treated animals must be discarded and withheld from collection.

Tail-to-Tail Arrangement

The specific orientation of dairy animals in the milking room designed to maintain animal comfort and minimize contamination.

Milk Stones

Mineral deposits that accumulate inside dairy utensils as a result of using water containing inorganic salts.

Stainless Steel Utensils

Durable milking equipment designed with rounded edges that provides high resistance to corrosion from alkaline and acid detergents.

Water Quality Standards (Dairy)

Chemical and bacteriological purity criteria requiring periodic testing, absence of inorganic salts that form milk stones, low bacterial counts, and total freedom from sewage and faecal pollution.

Milk-Handling Sequence

The standardized four-step post-milking process: Milk collection $\rightarrow$ Straining $\rightarrow$ Cooling $\rightarrow$ Storage.

Milk Cooling ($4^\circ\text{C}$)

The rapid reduction of milk temperature to $4^\circ\text{C}$ using can cooling or refrigerated bulk tanks, which slows bacterial growth without killing microorganisms.

Can Cooling

A cooling method in which cold water is kept outside the container so that milk held inside is cooled.

Bulk Cooling

A milk preservation method utilizing a dedicated storage tank equipped with an integrated refrigeration system.

Heat Treatment

A thermal process used to kill vegetative bacteria, viruses, and spoilage bacteria, inactivate most enzymes, and improve physical properties for processing.

Dairy Worker Hygiene Requirements

Mandatory standards including certified freedom from TB and brucellosis, clean lesion-free hands, wearing clean overalls, long boots, and head caps, and abstaining from smoking.

Pre-Milking Feeds to Avoid

Feeds such as turnips or garlic that must not be fed to dairy cows prior to milking to protect milk quality.