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A freemartin or free-martin (sometimes martin heifer) is an infertile cow with masculinized behavior and non-functioning ovaries. [1] Phenotypically, the animal appears female, but various aspects of female reproductive development are altered due to acquisition of anti-Müllerian hormone from the male twin . [ 2 ]
The pure Holstein Breed Society was started in 1946 in Great Britain, following the British Friesian Cattle Society. The breed was developed slowly up to the 1970s, after which there was an explosion in its popularity, and additional animals were imported. More recently, the two societies merged in 1999 to establish Holstein UK. [10]
Other than the few bulls needed for breeding, the vast majority of male cattle are castrated as calves and are used as oxen or slaughtered for meat before the age of three years. Thus, in a pastured herd, any calves or herd bulls usually are clearly distinguishable from the cows due to distinctively different sizes and clear anatomical differences.
Fishmeal and fish oil inclusion rates in aquafeeds have shown a continual decline over time as aquaculture grows and more feed is produced, but with a finite annual supply of fishmeal and fish oil. Calculations have shown that the overall fed aquaculture FIFO declined from 0.63 in 2000 to 0.33 in 2010, and 0.22 in 2015.
Cattle only produce milk after calving, and so every dairy cow must produce a calf every year. In dairy herds (which in Britain and Ireland are almost all Holstein-Friesians), the best milking cows will normally be bred to a dairy bull, usually by artificial insemination (AI). The female purebred dairy calves from these matings will go on to ...
The Holstein-Friesian was known to be the best dairy cattle breed for temperate region and the Sahiwal was the best dairy cattle breed for tropical areas. [10] As such, with crossbreeding and genetic mixture of both the Sahiwal and Holstein-Friesian, the AFS breed possesses qualities from both cattle to adapt to the tropical climates.
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