The metabolic status of cows with different level of uterine contractility and milk yield
Abstract
The aim of this work was to study the metabolism of dairy cows with a varying degree of uterine contractility on 20-30days post partum. Metabolic status was evaluated twice: at the end of the first and second month of lactation. Total protein, glucose, triglycerides (TG), activity of aspartate aminotransferase (AST), alanine aminotransferase (ALT), gamma glutamyl transferase (GGT) were determined in blood serum. The obtained data were analyzed using ANOVA (software SigmaPlot 12,5). The animals were divided into two groups. First group (GI): the uterus is in the pelvic cavity (n=8). Second group (GII): the uterus is in abdominal cavity (n=6). The uterus was measured by rectal examination. TG concentration was higher in GI than in GII (0.114 ± 0.015 mmol /L and 0.070 ± 0.011 mmol/L, p˂0.05 respectively) at the end of the first month of lactation. Total protein concentration was higher in GI (76.7 ± 1.1 g/L and 71.5 ± 2.0 g/L, p˂0.05) at the end of the second month of lactation. There were also different dynamic changes of biochemical parameters. ALT activity increased from 18.6 ± 2.1 u/L to 26.4 ± 2.3 u / L (p˂0.05), AST activity decreased from 96.6 ± 4.4 u/L to 83.2 ± 1.7 u/L (p˂0.05) in GI on the second month of lactation when compared to the first month. Only TG concentration changed in GII at the end of the second month of lactation (from 0.070 ± 0.011 mmol / L to 0.108 ± 0.007 mmol/L, p˂0.05). The 100-day yield of the current lactation were higher in GI (4342 ± 155 kg vs. 3808 ± 118 kg, p˂0.05). The study shows that a good postpartum uterine contractility can be combined with a high milk yield and depends on the features of homeorhetic mechanisms of the animal in early lactation.
About the Authors
V. .. Leibova
Russian Research Institute of Farm Animal Genetics and Breeding - Branch of the L.K. Ernst Federal Science Center for Animal Husbandry
Russian Federation
Russian Federation
G. .. Shiryaev
Russian Research Institute of Farm Animal Genetics and Breeding - Branch of the L.K. Ernst Federal Science Center for Animal Husbandry
Russian Federation
Russian Federation
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Leibova V..., Shiryaev G... The metabolic status of cows with different level of uterine contractility and milk yield. Genetics and breeding of animals. 2018;(2):87-93. (In Russ.)
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