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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% ...
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 ...
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 ...
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]
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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 ...
ABS Global, formerly the American Breeders Service, is an artificial insemination company that sells frozen bovine semen. It headquarters are in DeForest, Wisconsin . American Breeders Service was founded in 1941 by John Rockefeller Prentice .
The Black Baldy is a type of cross-bred beef cattle. It is traditionally produced by crossing Hereford bulls on Aberdeen Angus cows. [1]: 29 These cattle are commonly reared in Australia [2]: 190 and New Zealand. In North America, the term Black Whiteface is also used in some regions. [citation needed]