SU1713509A1 - Method for physiological evaluation of milking units - Google Patents

Abstract

The invention relates to animal husbandry, mainly to machine milking of farm animals, and can be applied for the physiological assessment of milking equipment. The aim of the invention is to improve the accuracy of the method. The method consists in the fact that the stimulating effect of milking machines is evaluated according to the following parameters: the volumetric flow velocity in the external external artery, systemic arterial pressure and vascular resistance. These values are determined before milking and during milking. The evaluation of milking machines is carried out by comparing the obtained data. 1 tab.

Description

The invention relates to the field of animal husbandry, mainly to machine milking of farm animals and can be used for physiological assessment of milking machines.

The aim of the invention is to improve the accuracy of the method.

EXAMPLE 1. The volumetric rate of blood flow in the external coronary artery of the cow is determined before milking. The optimal measurement interval is 3 minutes. The volumetric blood flow velocity is 2.98 l / min, the blood pressure is 99.0 mm Hg. and vascular resistance of the udder 33,22 mm Hg / l / min Vascular resistance of the udder is calculated by the formula

yr v

where R is vascular resistance:

Р - registered arterial pressure;

V-volumetric blood flow velocity.

In order to eliminate the influence of fluctuations in the initial hemodynamic values of the udder on the assessment of its changes occurring under the influence of milking and related factors, the data characterizing the volumetric blood flow velocity and vascular resistance during and after the completion are expressed in percent of the corresponding data for the three-minute interval preceding milking.

The average volumetric rate for the entire period of milking is 3.89 L / min, the blood pressure is 100.8 mm Hg. and vascular resistance of the udder 28.70 mm Hg / l / min, respectively, 130.5%, 101.8% and 86.4% of the corresponding data for a three-minute interval. Pre-milked cow.

In order to quantify the circulation of the udder, one of the external external arteries is operatively superimposed with an electromagnetic flowmeter. The operation is performed under endotracheal anesthesia. A cut is made in the groin area. From the main vascular and nerve bundle of this half of the udder, a section of the external cortical artery 3-4 cm long is carefully isolated. Its diameter is measured, after which an electromagnetic sensor is placed on the vessel, the diameter of which is 10% smaller than the diameter of the vessel. A sensor cable with a connector at the end is located at the top of the milk mirror.

To record the arterial pressure during this same operation, a siliconized catheter with heparin immobilized on its wall is inserted through one of the lateral branches of the common carotid artery into the common brachiocephalic trunk. Throughout the test, the catheter was washed twice daily with a 2.5% sodium citrate solution and filled with a heparin-5Tbic.M.e solution. in 1 ml.

Animals are taught to be milked in an electrophysiological chamber. The electromagnetic sensor connector is connected to a flowmeter, which is synchronously connected to a multi-channel polygraph. The siliconized catheter is washed with sodium citrate solution, attached to an arterial sensor, and a heparin solution is inserted into the catheter through an adapter. Under the key, the sensor is attached to the polygraph by opening the valve in the catheter-sensor system. The vacuum pump is turned on, the nipples are sanitized and the teat cups are put on them. A record of the intensity of milk excretion and the value of a single unit is made on a polygraph using a bucket sensor counter.

Milking machines were tested on cows of the second or third month of lactation under conditions of chronic experience. Experiments begin 10–12 days after surgery. Do t twice a day strictly at the same time after 12 hours. The duration of the original and primary is 10 days,

EXAMPLE 2. Three experiments (three cows in each experiment) were carried out to study the effect of varying degrees of additional stimulation of the udder on the intensity of milk withdrawal, volumetric blood flow velocity, arterial pressure and vascular udder resistance.

In the first experiment, in the initial period, milking was carried out with the ADF-1 apparatus followed by 10 with nipple treatment and in the main period — milking with the ADU-1 from 40 with udder preparation.

In the second experiment, in the initial period, ADU-1 was milked with unheated

milking cups and in the main - with heated cups. Predawning udder preparation - 10 s nipple treatment. In the third experiment in the initial period

The ADU-1 apparatus is milked and, in the main unit, the apparatus with pulsating overpressure in the interwall of the teat cup in compression stroke. Pre-milking udder preparation - 10 s processing

nipples.

The data characterizing the effect of milking with additional stimulation of the udder on the intensity of lactation, blood flow velocity, blood pressure and vascular resistance of the udder are shown in the table.

The maximum and average intensity of lactation in the main period in all three experiments increased compared with the initial period. The greatest significant increase in the lactation intensity is observed when milking with an overpressure apparatus. This device has a more pronounced stimulating effect on lactation in cows ..

As can be seen from the table, for the entire period of milking by the ADU-1 apparatus, followed by 40 s, preparation of the udder, the volumetric blood flow velocity increased by 10% (experiment 1), for the entire period of the Milking apparatus with electrically heated milking cups - it increased by 17.7 % (experiment 2) and apparatus with excessive pressure on

21.0% (experiment 3) in comparison with the initial period of each experiment. Thus, milking with a pulsating overpressure apparatus is accompanied by a more pronounced effect on the volumetric

blood flow velocity.

The increase in blood flow through the organ may be due to two reasons: an increase in systemic arterial pressure or a decrease in vascular resistance of the organ caused by dilation of the blood vessels. In order to gain insight into the mechanism of the increase in the volume velocity of blood flow in the udder during machine milking, the effect of it on the systemic arterial pressure is also studied, and on the basis of the obtained data, the vascular resistance of you is calculated.

Milking with additional stimulation of the udder during the main period of all three experiments leads to a decrease in vascular resistance of the udder. Over the entire period of milking, vascular resistance decreased significantly in experiment 1 by 6.6%, in experiment 2 by

11.1% and in experiment 3 by 12.8% compared with the initial period of each experiment.

Thus, the determination of the vascular resistance of the udder confirms the results obtained on the variability of the stimulating milking effects on the lactation intensity and the volumetric blood flow velocity in the external cortical artery.

Formula (gaining) A method for the physiological assessment of milking machines, including the determination of lactation intensity and blood flow velocity in the external adrenal artery, characterized in that, in order to improve the accuracy of the method, the arterial pressure and vascular udder resistance are additionally determined

0 before milking and during milking, and milking machines are evaluated by comparing the data obtained.

Claims (1)

Claim' A method for the physiological evaluation of milking machines, including determining the intensity of milk removal and the volumetric blood flow velocity in the external carotid artery, characterized in that, in order to improve the accuracy of the method, blood pressure and vascular resistance of the udder before milking and during milking are additionally determined, and milking machines are evaluated by comparing the data. Experience Experience period The intensity of milk excretion, g / min, and $ Medium Maximum Percentage of 3-minute interval before milking 1 Source Main 839.1 100.0 871.3 '103.8 1140.0 100.0 1173.3 102.9 2 Source 1158, 4 1314.0 100.0 100.0 Main Yes 3. Source zhs 102 ^, 3 100.0 100.0 • Main 853.0 1182.5 111.0 115,2 Volumetric blood flow velocity Arterial pressure Vascular resistance of the udder Average for the entire milking period Maximum value Average for the entire milking period Maximum value Average for the entire milking period Maximum value 117.1 134.3 99.4 97.8 84.9 72.8 127.1 146.4 99.5 98.5 78.3 67.3. 123.6 140.8 102.1 101.1 82.6 73L 141.3 165.3 103,4 102,4 71.5 61.9 144.3 179.4 101.3 100,2 70,2 55.9 165.3 209.0 95.0 96.3 57.4 46.0 Compiled by A. Filippov ' Editor N. Bobkova Tehred M. Morgenthal Corrector M. Maximishinets Order 640 Circulation Subscription VNIIIPI State Committee on Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhgorod, 101 Gagarin St.