Maria N Isakova, Marina V Ryaposova, Sergey V Mymrin, Ulyana V Sivkova

DOI: 10.33284/2658-3135-104-3-147

UDC 636.22/.28:591.149:591.469(470.54)

Determination of urea in the milk of highly productive cows – a prognostic marker of mastitis development

 Maria N Isakova1, Marina V Ryaposova1, Sergey V Mymrin2, Ulyana V Sivkova1

1Ural Federal Agrarian Research Centre of Ural Branch of the Russian Academy of Sciences (Yekaterinburg Russia)

2AO "Uralplemtsentr" (Yekaterinburg, Russia)

 Abstract. The article presents studies confirming the relationship between the deviation of the urea index in milk of highly productive cows and the presence of mastitis in their mammary gland. The studies were carried out in multiplication farm of Sverdlovsk region for three months and included a diagnosis of animals for clinical and subclinical form of mastitis, the definition of somatic cell level in milk and urea. A total of 315 animals were examined and 1260 samples were analyzed. As a result of studies, the presence of subclinical and clinical forms of mastitis was found in 58.10% and 1.90% of the studied animals, respectively. The number of affected lobes was 29.20%. Most often (79.17%) subclinical mastitis was found in the form of a mild lesion (+). In the largest number of animals, mastitis affects two udder lobes (38.80%). The average content of somatic cells during three months of the study was 441.97±39.83 thousand/ml, 463.86±38.92 thousand/ml, and 411.817±32.67 thousand/ml, respectively. The average urea content in milk in highly productive cows during the study was 19.21±0.17 mg/100ml, 23.86±0.44 mg/100ml, and 19.98±0.16 mg/100ml, respectively. At the same time, in the first month of the study, 10.03% of animals had deviations from the reference values, an increase in urea in milk to 31.25±0.65 mg/100ml was observed in 0.50% of the studied animals, a decrease to 12.78±0.29 mg/100ml was detected in 9.53% of cows, mastitis in these animals was detected in 82.5% of cases (15.0% - clinical mastitis, 67.5% - subclinical mastitis). During the second month of the study, the deviation from the reference values was observed in the direction of increasing and decreasing this indicator to 31.25±0.65 mg/100ml and 14.60±0.10 mg/100ml, respectively. The number of animals with deviations from the standard values was 5.71%, in these cows the presence of clinical inflammation in the mammary gland was detected in 20.0%, the share of latent inflammation accounted for 40.0% of cases. During the third month of the study, deviations from the reference values were found only in the direction of a decrease of 13.22±0.35 mg/100ml, and were diagnosed in 9.93% of the studied animals. Mastitis was diagnosed in 71.4% of cows (16.7% of animals had a clinical form of inflammation, and 54.7% - subclinical).

Keywords: highly productive cows, mastitis, alimentary mastitis, metabolic disorders, urea in milk, somatic cells, disease prognosis.

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Isakova Maria Nikolaevna, Cand. Sci. (Veterinary), Senior Researcher, Ural Federal Agrarian Research Centre of Ural Branch of the Russian Academy of Sciences (FGBNU UrFANITS UB RAS), tel.: (343)257-20-44, 620142, Yekaterinburg, Russia, Belinsky str. 112a, e-mail: Tmarya105@yandex.ru

Ryaposova Marina Vitalievna, Dr. Sci (Biol.), Deputy Director for Research, Ural Federal Agrarian Research Centre of Ural Branch of the Russian Academy of Sciences (FGBNU UrFANITS UB RAS), Associate Professor, tel.: (343)257-20-44, e-mail: riaposova76@mail.ru, 620142, Yekaterinburg, Russia, Belinsky str. 112a

Mymrin Sergey Vladimirovich, Cand. Sci. (Biol.), First Deputy General Director of OA Uralplemcenter, 620061, Yekaterinburg, Russia, Siberian tract, 21 km, e-mail: mymrinsv@yandex.ru

Sivkova Ulyana Vladimirovna, Postgraduate Student of the Ural Federal Agrarian Research Centre of Ural Branch of the Russian Academy of Sciences (FGBNU UrFANITS UB RAS), 620142, Yekaterinburg, Russia, Belinsky str. 112a, tel.: (343)257-20-44, e-mail: sivkova@uralbiovet.ru

Received: 12 August 2021; Accepted: 13 September 2021; Published: 30 September 2021

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