herd

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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 periodicals archive ?
Annual site summaries for proportion of usable space, Northern Bobwhite covey densities, distance to nearest neighboring coveys, frequencies of covey mergers, and mean movement rates from four private land study sites in southwestern Ohio studied during October-March 2009-2011.
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He leaves his wife of 57 years, Marlin Jean (Duffy) Covey; four children, Deborah (Covey) Knox, Marlon, Joel and Jeffery Covey; eight grandchildren, James, Jeffery and Joel Knox, Jennifer (Knox) Tello, Lauren and Ross Covey, Jillian and Jana Covey; three great-grandchildren, Roxylin, Emmelyn and Charles Knox; as well as several other family members and friends.
Covey calls emotional deposits and emotional withdrawals.
Hunters should find some pretty big coveys when hunting shoulder high sage and chaparral.
His treatment at the hands of Covey, being "broken," was his "crucifixion"; his defeat of Covey was his "resurrection" and "ascension.
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Horner knows this chukar country and where to find a covey on the face of a steep mountain.
Covey is the ideal individual to help lift the school of business to a position of leadership among America's premier institutions," Huntsman said.
A former NASA astronaut, Covey piloted STS 51-I, a spacecraft repair mission in 1985 and STS-26, the first flight of Discovery after the Challenger accident in 1988.
The recent heavy rains won't make finding a covey of birds much easier but there is a pretty large population to hunt.
The Covey site opens with the statement: ``Traditional time management suggests that by doing things more efficiently you will eventually gain control of your life and this increased control will bring the peace of mind and fulfillment you are looking for.