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Farmyard milking machine

Newspaper "Your farmstead"

03 June 2020

Animals Newspaper

631

Milking machines are useful in any farm with more than one cow, where milking them by hand is too long and difficult. The purchase of a special installation allows you to save energy by getting more milk in the same time. Modern milking machines are developed on the basis of many years of experience and take into account all the characteristics of cows, so the milking process becomes easy for both the cow and the one who milks her. At the same time, the device can be individually adjusted for each animal, depending on the characteristics of the udder of a particular cow. With such a gentle approach to the milking process, you can get more milk from one cow. It should be noted that it makes sense to purchase a milking machine if the cow meets the requirements of machine milking. In machine milking, the shape, placement, orientation and size of the cow's teats are of great importance. Suitable for such milking are cows with a cupped and rounded udder, with cylindrical or slightly conical teats, with a diameter of 1.8 to 3.2 cm and a length of 4 to 9see. It should be borne in mind that with age in cows, the diameter and length of the teats increase due to milking. The most convenient placement of milkings on the udder is one in which the distance between the front teats is 7–12 cm, and between the rear teats is 6–10 cm. machine milking of cows is difficult. At a close distance, it is difficult to put on the cups of the milking machine, and at a large distance, nipples and hoses may be bent (which slows down the milk flow process). You should also pay attention to the direction of the nipples. Under the weight of the milking clusters, the milkings always bend slightly. This makes it difficult for milk to flow freely, especially if the nipples are tilted forward or to the side. If the milkings are very thin (diameter less than 2 cm), the teat cups do not hold well on them. Teats are not squeezed enough by the milking cup rubber, which affects milk flow. Thick milkings (more than 3 cm in diameter) are squeezed too much by rubber, which disrupts blood circulation and also inhibits milk flow. On small and short teats (less than 5 cm), the teat cups do not hold well, often fall off. You have to support the milking machine with your hands or tie it to the body of the cow. If the milkings are too long (more than 10 cm), during milking, the glasses “crawl” on them, which stops the milk flow. It is necessary that the distance from the lower border of the udder to the ground be at least 45 cm, otherwise it will be difficult to connect the milking machine to the udder, and its collector will be on the floor. The udder should be evenly developed: the milk yield of the front lobes is at least 40% of the single milk yield. Cows suffering from mastitis, with atrophied quarters and with painful swelling of the udder after calving are not allowed to machine milking. For machine milking of cows and goats in private farms, the AID-2 milking machine is often used (the capacity of the milking bucket is 19l).

If the milking machine sucks in air - Agrovesti.net

Cattle

: 03/24/2016; 19465

Source: Profi. com

Often when cows with very large udders and very small or short teats are milked, air ingestion and entrapment problems occur. Tips for troubleshooting are given by Bernd Scheibel.

Herdsmen often complain that certain breeds of cows have short or very thin teats and udders that are too large. Because of this, the milking machines do not grip the teats well and milk is poorly milked out. It is almost impossible to achieve the optimal location of the milking machine with such udder shapes.

If at the end of milking the udder hindquarters converge towards each other, the teats are so close together that the upper parts of the rubber on the teat cups rub against each other. As a result, the rubber parts pull each other so that the milking cluster sucks in air, hisses, and eventually the teat cups fall off. This leads to interruption of the vacuum and stress to the cows.

If the teats are in contact with each other, you can put on the teat cups crosswise.

Liner is always a compromise solution. New research has shown that 5,800 Holstein cows have teat diameters between 18 and 36 mm. The teat length was varied between 2 and 9.5 cm.

Thanks to its trapezoidal shape, the HarmonyPlus milking cluster from DeLaval is suitable for milking cows with closely spaced teats. Many nipples do not reach the required technical optimum length of 4 to 7 cm. For nipples that are shorter than 4 cm, the contact surface of the nipple skin and the liner is too small to provide sufficient grip.

In tie-down cows, a special milking cluster with a suitable liner can be selected for problematic cows. However, in milking parlors, the choice of liner remains a compromise because many cows with different teat sizes must be milked with the same cluster.

Of course, there are milking machines that can also take thin teats, but they have one drawback - a rather low milking quality. Since there are few cows with irregularly shaped udders and teats, it is not profitable to change the entire milking installation.

Due to the frequent occurrence of closely spaced hind udder teats, some producers are ready to produce special milking units for such cows. For example, in the new 300ml manifold from WestfaliaSurge Classic E, the posterior lobe ports are closer together than the previous model. DeLaval solved the problem in a similar way with the HarmonyPlus trapezoidal milking cluster.

Better teat cup grip. Despite these improvements, not all udder shapes and teat sizes become suitable for milking. The mentioned problems can be solved or reduced with a good "service hand".

But the following tricks can also help:

■ install soft milk hoses: the short milk hoses between the teat cup and the collector must be very soft so that they can adapt and be flexible. Hint: items treated with talc are softer than shiny material. In addition, short milk hoses must be at least 160 mm long. When installing, make sure that the short milk hose and the short cycle hose are not twisted, otherwise they will have a negative effect on the milking process.

■ install small head liner in teat cups: in herds with cows with short and thin teats, small head liner should be used to fit the teat base. When choosing a teat liner, one should proceed from the diameter of the teats on average for the herd. Regularly measure the diameter of the teats with a measuring caliper.

To better guide teat cups with narrow teats, they can simply be tied together.

■ do not massage heifers before milking: if heifers have significant problems during milking, they should not be left to wait in the milking parlor while the cluster is being put on. Milk the first streams of milk and put on the cluster immediately. If the animals are restless and knock down the milker, you can try putting it on again. If this does not help, heat the teat cups with warm water. Basically, on the third attempt, the device can be put on.

■ Teats that point inward should be milked with crossed cups, if teats pointing towards the middle of the udder, the teat cups should be wired tightly or simply tied. You can do it even easier by putting milking cups crosswise. This has the advantage that the milk machine will not suck in air and the udder lobes will be milked anyway, because the load changes the direction of the traction force and raises the udder.

■ Animals whose milking unit sucks in air during the massage must not be massaged mechanically, but exclusively by hand. Air suction is always bad, because it leads to an undesirable atomizer effect, as well as to acyclic vacuum fluctuations.

If the milking machine sucks in air, you can compact it with a towel.

■ Tighten with a towel: with very thin, short teats, the liner cannot tightly encircle the teat, so the milking machine sucks in air. It is often enough to seal with a cotton towel, slipping it into the teat cup at the base of the teat.

■ milking the udder halves in turn: if the udder is very large or stepped, you can milk first one and then the other half of the udder.

■ special cluster for large udders: regardless of the equipment, large udders are difficult to milk. If all these measures do not help, but the cow must remain in the herd, you can purchase a special milking machine with very long hoses or a special teat rubber with an elastic head.

50% of teats are too short

Every second black-and-white cow has short teats, so it is hardly possible to organize milking properly. This is the result of a study by Dr. Katja Graff from the Dresden School of Technology and Economics. As part of this study, 2,109 nipple parameters were measured over a period of 14 months.Holstein cows from seven enterprises. The results of 5,885 measurements are briefly presented:

■ teat diameter varies between 18 and 36 mm;

■ teat lengths vary between 2 and 9.5 cm. Teats, especially in the hind parts of the udder, have become 0.5-1 cm shorter in recent decades. Only half of all measured teats are within the optimal range for milking. In addition, the length of the teats must be greater than 4 cm in order to provide sufficient grip for the teat liner in the teat cup;

■ The distance between the teats of two adjacent udders varies greatly. The maximum distance is 42 cm. In contrast, there are many animals in which the nipples are in contact with the nipples of the adjacent lobe. From a technical point of view, the desired distance should be between 6 and 30 cm in order to ensure that the teat cups are vertical;

■ The distance from the bottom of the udder to the floor varies between 20 and 69 cm. The distance must be at least 45 cm so that the cluster does not rest on the floor during milking. Often the udder is too low. And the smaller the distance to the floor, the higher the content of somatic cells at a comparable age and stage of lactation of animals.

Authors' conclusion

In the future, breeding should be more focused on not reducing the length of the hind udder teats. In addition, the range of fluctuations in the parameters of the teats must be limited in order to match the existing milking technology. The distance from the bottom of the udder to the floor is of great importance, since this indicator significantly affects the health of the udder and suitability for milking.