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Of the 9 million dairy cows in the U.S., approximately 90% of them are of the Holstein descent. [66] The top breed of dairy cow within Canada's national herd category is Holstein, taking up 93% of the dairy cow population, have a production rate of 10,257 kilograms (22,613 lb) of milk per cow that contains 3.9% butter fat and 3.2% protein [8]
In cows, a complete estrous cycle lasts 21 days. Most commonly, dairy producers discuss the estrous cycle as beginning when the cow is receptive to breeding. This short phase lasting only about a day is also known as estrus or colloquially, heat. The cow will often exhibit several behavioral changes during this phase including increased ...
These “Synch” protocols may include: Select Synch, OvSynch, CoSynch, and Modified Select Synch [2] The synchronization of the estrous cycle is commonly used in different industries, such as Dairy and Beef cattle. Synchronization allows these industries to improve management and nutrition of the cattle, while also decreasing expenses. [3]
The Holstein Friesian is an international breed or group of breeds of dairy cattle. It originated in Frisia, stretching from the Dutch province of North Holland to the German state of Schleswig-Holstein. It is the dominant breed in industrial dairy farming worldwide, and is found in more than 160 countries.
Coloration varies with breed; common colors are black, white, and red/brown, and some breeds are spotted or have mixed colors. [6] Bulls are larger than cows of the same breed by up to a few hundred kilograms. British Hereford cows, for example, weigh 600–800 kg (1,300–1,800 lb), while the bulls weigh 1,000–1,200 kg (2,200–2,600 lb). [7]
Selective breeding has been responsible for large increases in productivity. For example, in 2007, a typical broiler chicken at eight weeks old was 4.8 times as heavy as a bird of similar age in 1957, [36] while in the thirty years to 2007, the average milk yield of a dairy cow in the United States nearly doubled. [36]
One of the Channel Islands cattle. Harzer Rotvieh: Germany: Hays Converter: Canada: Hérens: Switzerland: Holstein-Friesian: Netherlands [1] 53 14 3.65 [2] 3.06 [2] Known for producing the most milk of any cattle. Illawarra Shorthorn: Australia [1] 7.5 2 Irish Moiled: Ireland: 7.5 2 Rare breed and can be dual purpose, meat and milk. Jamaica ...
Female cattle, also referred to as "heifers" in agriculture, will gradually enter standing estrus, or "standing heat," starting at puberty between 9 and 15 months of age. The cow estrous cycle typically lasts 21 days. [5] Standing estrus is a visual cue which signifies sexual receptivity for mounting by male cattle.