مرکز منطقه ای اطلاع رساني علوم و فناوري - ارزيابي وضعيت كتوز باليني با تكيه بر مقادير فصلي بتاهيدروكسي بوتيرات در سرم خون گاوهاي شيري اروميه

چكيده لاتين :

The number of 561 cows sera from industrial dairy herds were collected during Autumn (161 samples). Winter (181 samples), Spring (136 samples) and Summer (183 samples) from urmia region in Iran to investigate; 1- the concentrations of beta hydroxy butyrate (BHBA) in bovine sera. 2- the effects of season on BHBA concentration, and 3- the distribution of subclinical and clinical ketosis in dairy herds. BHBA concentration was measured by spectrophotometer. Mean+SE of BHBA concentration in Autumn, Winter, Spring and Summer were 0.82+0.05, 0.79+0.08, 0.66±0.04 and 0.52+0.09, respectively. Results showed differences among seasons (P0.05). Mean BHBA concentration in Autumn and Winter were significantly (p<0.05) differed from Spring and Summer, while no difference was observed between Autumn and Winter. There were also differences (p<0.01) between BHBA concentration in Summer and Spring. If the BHBA concentration of serum as classified into 0-0.2 (physiological status), 0.21-1.4 (suspected subclinical), 1.41-3 (subclinical) and >3mmol/1 (clinical ketosis), therefore, the distribution were 361(63.35%), 138 (24.6%), 55(9.8%) and 7 (1.25%), respectively. Results showed differences (X .32, df=3, p<0.05) among them. There were differences (p<0.05) in clinical ketosis between Winter and Summer but not with other seasons. Subclinical ketosis in Summer was differed (p<0.05) with subclinical ketosis in all other seasons. Suspected subclinical ketosis was differed (p<0.05) among seasons . It is concluded that based on the sera BHBA Cone. Subclinical and clinical ketosis could be important in Urmia dairy herds, the BHB concentration of cows sera in Autumn and Winter are at me risk of subclinical to clinical ketosis. On the other hand, clinical ketosis may be important in Winter While subclinical in Autumn. Ketosis is not expected to occur in Summer.