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A typical precocial mammal has a gestation period almost four times longer than a typical altricial mammal of the same body size. [20] Precocial mammal species generally have greater adult body weights than altricial mammals as precocial mammals have markedly longer gestation periods than altricial mammals. [21]
Cape robin-chat (at right) feeding a red-chested cuckoo parasite chick. The Cape robin-chats are monogamous and highly territorial nesters. [19] A pair's territory usually comprises some fraction of a hectare, but its extent varies considerably depending on the habitat. [18] The nest site is within 5 feet (regularly 0 – 2 feet) from the ground.
In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them. The incubation period is divided into three phases.
The duration of this period varies between species. For most species, the amount a fetus grows before birth determines the length of the gestation period. Smaller species normally have a shorter gestation period than larger animals. [2] For example, a cat's gestation normally takes 58–65 days while an elephant's takes nearly 2 years (21 ...
Broiler breeder farms raise parent stock which produce fertilized eggs. A broiler hatching egg is never sold at stores and is not meant for human consumption. [9] The males and females are separate genetic lines or breeds, so that each line can be selected for optimal traits for productivity in either females or males, rather than a single line in which a compromise is reached between female ...
[citation needed] Mating occurs throughout the year with a gestation period of approximately 277–290 days. Most commonly a single calf is born, but twins are not unknown. Sexual maturity is reached at about eighteen months. Highland cattle also have a longer expected lifespan than most other breeds of cattle, up to 20 years. [24]
Egg prices have increased more than any other consumer staple over the past year, hitting an average of $3.37 per dozen in October, a 30% jump from last year. While not as steep as the $4.82 peak ...
On average, a chicken lays one egg a day, but not on every day of the year. This varies with the breed and time of year. In 1900, average egg production was 83 eggs per hen per year. In 2000, it was well over 300. In the United States, laying hens are butchered after their second egg laying season.