Which cow is the best. Productivity of cattle
Evaluation of sires by the quality of offspring is done by breeding breeders. Milk productivity in highly productive cows is not a constant value. It depends on the breed of the animal, heredity, age, physical condition of the individual, nutrition, and conditions of detention. Milk yield is highly dependent on the lactation period. About two months before the birth of the calf, milking of the cow stops. Therefore, 305 days is the optimal time period for lactation. More information on this topic can be found in the article "Factors affecting the milk production of a cow". Examples of mathematical calculations of cattle milk yield The productivity of cows is assessed daily, every ten days or monthly. The most accurate method is to control the milked milk every day, the most common is once every 10 days. For example, control milking of a certain individual can be done on the 2nd, 12th and 22nd of the month. The mass of the resulting product is multiplied by 10 - it turns out the displacement per decade. In sum, these three values are an indicator of the milk production of an individual cow for a month. In suckling rearing of young animals, the productivity of cows is estimated as follows: half of the udder is milked, and the second part is sucked out by calves. The weight of the milked milk is multiplied by two and the mass of the full milk yield is obtained. Highly productive cows give up to 30,000 kg of milk per lactation period. The milk production of cattle is highly dependent on age. Young animals gradually increase milk yield until the third calving, then for about three years the amount of milk remains the same, and after the sixth calving, the indicators gradually decrease. Therefore, it is more rational to use dairy cattle for about ten years. And only highly productive cows are exploited longer. According to the estimated characteristics of the milk of daughters and the meat productivity of sons, the bull-producer is assessed for the quality of the offspring. The male is assigned categories and class. Exterior features of dairy breeds When evaluating the exterior, experts recommend paying close attention to the shape of the udder. It is bowl-shaped, goat and rounded. In highly productive cows, it has the shape of a bowl, the nipples are widely spaced, all lobes are evenly developed. Such a structure will allow the use of machine milking. The distance from the bottom of the udder to the ground should be about half a meter. Animals with conical or cylindrical teats are suitable for machine milking, their length and width of the base should be about 8 cm. Dairy breeds have a small, elongated head. The withers are high and straight in strong animals, and sharp in muscle weakness. The limbs are strong, the joints are well defined, the hooves are moderately developed. The exterior of cows is the external expression of the constitution, associated with the breed and physical condition of the animal.