herd

(redirected from herds)
Also found in: Dictionary, Thesaurus, Acronyms, Idioms, Encyclopedia.

herd

(hĕrd),
A group of people or animals in a given area.
[O.E. heord]

herd

(hĕrd)
A group of people or animals in a given area.
[O.E. heord]

herd

[AS. heord]
Any large aggregation of people or animals.

herd

a group of animals, usually cattle, or pigs, or related wild animal species, which live a collective life together. This may be a natural pattern of behavior or be imposed by a human operated management system.

herd abnormality
an abnormality detectable only by examination of epidemiological data, e.g. milk yield per hectare, conception rate to first service.
herd composition
includes bulls (where applicable), cows in milk, dry cows, heifers not yet calved, bred heifers, virgin heifers, yearlings, calves weaned and suckers or at foot. Called also herd structure.
herd diagnosis
a diagnosis made to fit a herd problem which may be, for example, a low reproduction rate, or wool yield, or win rate at the races.
dairy herd
herd used exclusively for milk production.
herd epidemic
an epidemic confined to one herd.
herd fertility control scheme
programs based on surveillance of all reproduction data and comparison of indexes with preset targets. Correction of inefficiencies may be implemented by the farmer but diagnosis of the cause and treatments and prophylaxes are largely the province of the veterinarian.
herd health program
a health management system based on periodic visits to the herd by a veterinarian to check the status of a series of identifiable health parameters including production, reproductive efficiency, mastitis prevalence, calf survival, cow culling and mortality rate, fecal egg counts. Superior programs also include production management so that genetics, nutrition, housing, disease control and financial management are coordinated in a wholefarm approach.
herd immunity
a level of resistance in a herd or flock which is sufficient to prevent the entry of a particular disease into, or its spread within, the herd. The resistance may be innate, a genetically based resistance, or acquired as a result of previous exposure to the particular agent or of vaccination. The general usage of the term relates to the prevention of spread of infection at an epidemic level. So that in a herd in which there are 70 to 80% of immune animals there may be sporadic cases but the prevalence is unlikely to be significant. The same comments apply to larger populations, e.g. a wild animal or companion animal population which is really not managed as a herd.
herd level test
test performed on the entire herd or an adequate sample of it.
rolling herd average (RHA)
the average milk production per herd per year based on the 12 months just finished. Upon completion of a new test record, usually at monthly intervals, the record for the same period of the previous year is deducted and the new record is added, then a new rolling 365-day average is calculated. RHSs are updated with each new test. See also moving average.
herd sampling
examination, either physical or clinical pathological, of a herd to determine the herd status in a particular epidemiological parameter.
herd size
a critical factor in planning for productivity efficiency. May be quoted as the number of animals of a particular age or stage of production, e.g. milking cows, assuming that other, usually young, stock are also carried on the farm.
herd structure
see herd composition (above).
herd udder health
status of the herd with respect to the prevalence of quarter infection, clinical mastitis, teat lesions.
References in classic literature ?
I see in my mind a herd of wild creatures swarming over the earth, and to each the herdsman has affixed some barbarous sound in his own dialect.
As far as his eye could reach, the country seemed absolutely blackened by innumerable herds.
A herd of buffalo, startled by his approach, rose ready to charge or to fly.
To reach the gate he must pass directly through the herd which had huddled affrightedly close to the opening so that once again there was a furious rush of hoofs as Numa strode quickly to the side of the portal.
This deer is exceedingly abundant, often in small herds, throughout the countries bordering the Plata and in Northern Patagonia.
The people and the herd must be angry with me: a robber shall Zarathustra be called by the herdsmen.
Swine, fool, swine,'' said the herd, ``every fool knows that.
Drive in your herd tomorrow to the market-place and you shall have money down.
Then one of them raised his rifle and fired into the midst of the surprised and angry herd.
And here's an engineer who doesn't dare to run the locomotive into this herd of beasts
And if Hurton can't clean it up, you'd better get rid of the herd before it gets known around the country.
Feeding with the herd were many of the little fellows not much larger than those which remained attached to their parents, and from the young of that size the herd graded up to the immense adults.