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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% ...
Over 1000 breeds of cattle are recognized worldwide, some of which adapted to the local climate, others which were bred by humans for specialized uses. [1]Cattle breeds fall into two main types, which are regarded as either two closely related species, or two subspecies of one species.
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 ...
The reverse cross, of Angus bulls on Hereford heifers, may also be employed in an attempt to produce smaller calves and thus reduce dystocia during birth. [ 3 ] : 256 The first-generation calves from this cross uniformly exhibit the three principal dominant traits of the parent breeds – the polled (hornless) characteristic and the black coat ...
The best bulls go to artificial insemination (AI) cooperatives where semen is taken. AI allows the wide distribution of a bulls' genetics to the benefit of more farmers. However, in order to guarantee their genetic qualities, the bulls are subject to a strict selection scheme to increase the accuracy of the different genetic indexes.
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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An Australian Braford bull. The Australian Braford is a breed of beef cattle, developed in Queensland between 1946 and 1952 in a program to produce cattle that were resistant to cattle ticks and tolerated the heat better than some other breeds.