(redirected from weaning age)
Also found in: Dictionary, Thesaurus, Medical, Legal.


a. a period of history marked by some feature or characteristic; era
b. (capital when part of a name): the Middle Ages; the Space Age
2. Geology palaeontol
a. a period of the earth's history distinguished by special characteristics
b. the period during which a stage of rock strata is formed; a subdivision of an epoch
3. Myth any of the successive periods in the legendary history of man, which were, according to Hesiod, the golden, silver, bronze, heroic, and iron ages
4. Psychol the level in years that a person has reached in any area of development, such as mental or emotional, compared with the normal level for his chronological age
5. of age adult and legally responsible for one's actions (usually at 18 or, formerly, 21 years)



in humans, a stage of development that is characterized by specific regularities of formation of the organism and personality and by relatively stable morphophysiological and psychological traits. While age is a stage in the biological maturing of the organism, a process controlled by genetic factors, it is also a concrete result and stage of the social-psychological development of the personality and is determined by the conditions of life, training, and upbringing.

The content and form of training and upbringing are historically composed and varied according to age; in their turn they affect the determination of the boundaries and possibilities of a given age. In contemporary pedagogy and developmental psychology, several ages are differentiated with respect to the known relationships of the boundaries: infancy (from birth to one year); pre-preschool, or early childhood (from one to three); preschool (from three to seven); early school age (from seven to ten years); juvenile, or middle school (from ten to 15); and late school, or early youth (15 to 18 years old). Beyond these limits there is no generally accepted classification in the literature; only old age is considered separately. With the increased longevity noted in the 20th century, gerontology and gerontopsychology have arisen as disciplines to study the problems of prolonging the active life of a human being. Each age has a characteristic structure of cognitive, emotional, and volitional properties and qualities; forms of behavior; types of relationships to the environment; and peculiarities of structure and functioning of various organs and systems of the organism. This structure, however, is not invariable: in the 20th century a general acceleration of the physical and mental development of children has been noted. On the other hand, educational theory, in solving the problem of optimizing training, widens the possibilities of age and the boundaries of acquiring knowledge. Training must take into account not only the level of development achieved but also the development perspectives (the concept of “zones of imminent development,” as formulated by L. S. Vygotskii): the teacher must know not only what is present in a child of a given age but also what can be achieved, given certain conditions, by the child in the near future.



Period of time from origin or birth to a later time designated or understood; length of existence.
Any one of the named epochs in the history of the earth marked by specific phases of physical conditions or organic evolution, such as the Age of Mammals.
One of the smaller subdivisions of the epoch as geologic time, corresponding to the stage or the formation, such as the Lockport Age in the Niagara Epoch.


(aerospace engineering)
References in periodicals archive ?
The greatest importance order was obtained for age at the end of grazing period (100%), followed by weight at the end of grazing period, weaning age, birth weight and grazing period (Table II).
ADG was calculated with the ratio of the difference between the obtained weaning and birth weight by the weaning age in days, expressed by:
It was observed that the weaning age for the three captive Sunda pangolin young MJ85, MJ-X1b1, and QFY-34 was 115, 105, and 136 day (118.67 [+ or -] 15.82 days, around four months), respectively; and their weaning weight was 1.88, 0.93, and 0.75 kg (1.19 [+ or -] 0.50 kg), respectively.
The most significant factors that place a herd in the bottom 20% of herds are nonproductive days and weaning age. Nonproductive days are the days a sow is neither pregnant nor lactating.
What finally transpires is that at weaning age an additional food source is needed to bridge the nutritional gap that would otherwise be created if only milk diet was continued.
Early weaned ewes were managed with unweaned ewes and lambs in grass-clover mix until conventional weaning age (in 2015 on unrestricted grass-clover pasture and in 2016 on restricted-grass-clover pasture).
The results showed that mean feed intake in weaning age groups-A, B and C was 5.71, 4.34 and 6.02 kg, respectively.
13 kg, 90 days [greater than or equal to] weaning age a$?
Through the TP measurements, an equation was developed to predict the live weight of Pega donkeys from birth to weaning age. Accuracy of the linear (MARCENAC et al., 1964; PEARSON & OUASSAT, 1996; ALUJA et al., 2005; NENGOMASHA & PEARSON, 2016) and nonlinear equations (Logistic, Gompertz, and Von Bertalanffy) described in the literature was also tested for BW prediction based on animals TP and the data obtained were compared with those obtained from using the proposed equation.
An unexpected finding was that only head-crest size and gluteal muscles were strongly related to offspring survival (measured as infants that survived to weaning age) and overall reproductive success, measured as the number of surviving offspring.
When the kids reach weaning age, 8 to 12 weeks old, they get 2ccs of C&D with Tetanus.