Search results
Results from the WOW.Com Content Network
A number of factors determine how quickly any changes may occur in a species, but there is not always a desire to improve a species from its wild form. Domestication is a gradual process, so there is no precise moment in the history of a given species when it can be considered to have become fully domesticated.
It can be an energetically demanding process, with adult albatrosses losing as much as 83 g of body weight a day. [6] Megapode eggs take from 49 to 90 days depending on the mound and ambient temperature. Even in other birds, ambient temperatures can lead to variation in incubation period. [7] Normally the egg is incubated outside the body.
The young raptors are put in a “hack box”, boxes that contain a nest inside that protect them from predators and are usually placed on a high site, e.g. cliffs, atop poles. Eggs are either captive bred or taken from wild nests and the chicks are placed in the boxes a couple of weeks before they reach their fledge age of six weeks. [1]
The house crow (Corvus splendens), also known as the Indian, greynecked, Ceylon or Colombo crow, [2] is a common bird of the crow family that is of Asian origin but now found in many parts of the world, where they arrived assisted by shipping. It is between the jackdaw and the carrion crow in size (40 cm (16 in) in length) but is slimmer than ...
External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. [1] It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
Domestication syndrome refers to two sets of phenotypic traits that are common to either domesticated plants [1] [2] or domesticated animals. [3] Domesticated animals tend to be smaller and less aggressive than their wild counterparts; they may also have floppy ears, variations to coat color, a smaller brain, and a shorter muzzle.
For example, waterfowl captured in a drive can yield a return of around 2,000 kcal/hour, whereas an antelope can yield as much as 31,000 kcal/hour, and wild rye around 1,000 kcal/hour. [6] Battery hens: poultry is a major source of food, the chicken alone providing 20% of the world's animal protein. [7]
Meleg estimates that 15–20% of eggs fail to hatch in well-maintained pigeon lofts. [20] Egg size is important for the squab's initial size and for mortality at hatching, [citation needed] but becomes less important as the squab ages. Aggrey and Cheng feel that the hatched weight of squabs is not a good indicator of their weight at four weeks old.