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Beefmaster heifers. Beefmaster is a breed of beef cattle that was developed in the early 1930s by Tom Lasater (the breed founder), [1] from a systematic crossing of Hereford cows and Shorthorn cows with Brahman bulls. The exact mixture of the foundation cattle is unknown, but is thought to be about 25% Hereford, 25% Milking Shorthorn and 50% ...
The best bulls identified at Lanaud are sent to another test station at Naves in Corrèze. Here they are tested more accurately and evaluated for feed conversion efficiency, growth and muscle development. Progeny of the top 10 bulls out of this testing, and the best natural service bulls, are then evaluated.
Using frozen semen for dairy cattle has been done since the 1950s. The oldest semen believed to be in existence was from a sire named Cottonade Emmet, who was a member of the American Breeders Service sire battery in 1952. Semen was collected on Emmet in November 1952 and has been used several times to produce offspring. However, the last time ...
From about 1880 bulls of the British Hereford and Beef Shorthorn breeds were used to improve them; [3]: 290 substantial separate Shorthorn and Hereford herds were kept to supply the bulls. [ 5 ] : 115 In 1910 a part-zebuine bull, descended from an Ongole bull imported in 1906 directly from India, was acquired and was cross-bred with cows of the ...
Cattle breeds fall into two main types, which are regarded as either two closely related species, or two subspecies of one species. Bos indicus (or Bos taurus indicus ) cattle, commonly called zebu, are adapted to hot climates and originated in the tropical parts of the world such as India, Sub-saharan Africa, China, and Southeast Asia.
This is a list of some of the cattle breeds considered in the United States to be wholly or partly of American origin. Some may have complex or obscure histories, so inclusion here does not necessarily imply that a breed is predominantly or exclusively American.
This procedure is used frequently with large mammals, particularly bulls and some domestic animals, as well as humans who have certain types of anejaculation. Electroejaculation has also been used for the cryoconservation of animal genetic resources , where semen is stored in low temperatures with the intent of conserving genetic material and ...
Semen can be either liquid or frozen. There are many kinds of preservatives used in dilution with semen - most contain energy and antibiotics for liquid, and protection from freezing for frozen semen. Many studies are ongoing to improve preservation, increase liquid semen storage time, and reduce or remove bacteria from semen. [12] [13] [14]