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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. [34] Precocial mammal species generally have greater adult body weights than altricial mammals as precocial mammals have markedly longer gestation periods than altricial mammals. [35]
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.
A steer. The Texas Longhorn is an American breed of beef cattle, characterized by its long horns, which can span more than 8 ft (2.4 m) from tip to tip. [4] It derives from cattle brought from the Iberian Peninsula to the Americas by Spanish conquistadors from the time of the Second Voyage of Christopher Columbus until about 1512. [5]
Breeds of Cattle – Cattle.com; Breeds of Cattle – Cow World (archived 19 January 2017) Cattle Breeds – Embryoplus.com (archived 29 November 2013) Breeds of Cattle – Official 2nd Edition; Cattle Breeds of the World; Portuguese Cattle Breeds (archived 17 January 2016) EuReCa – Towards self-sustainable EUropean, REgional CAttle breeds
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Based in Fort Worth, Texas, the organization was founded in 1964 to serve as a registry for the longhorn breed. The Association was started by rancher Charles Schreiner, III, grandson of the legendary cattle baron Captain Charles Armand Schreiner who sent approximately 150,00 head of longhorn to market after the Civil War. [1]
In the event, this was not found to be necessary, and the cattle were sold off; some were used to create the Africangus cross-breed, and others contributed to the development of the Barzona. [4]: 759 A breed association was formed in 1951, and the first bulls were sold in the same year. [3]: 290
The gestation period averages 285 days, but varies depending on the age and nutrition of the mother. The sex of the calf may also affect the carrying time, as male calves are carried for a longer period than females. Location, breed, body weight, and season affect the overall health of the animal and in return may also affect the gestation period.