Abstract
Diurnal rhythm of blood biochemical profile was studied in adult and apparently healthy, male Martina Franca (Poitou) jacks (n=6). The jacks weighing between 270 to 350 kg were fed with standard ration for maintenance as per NRC (2007) from 10:00h to 14:00hr. The donkeys remained exposed to solar radiation. Blood was collected for biochemical parameters at 07:00h, 10:00h, 14:00h and 16:00h on 1st, 4th and 7th day in a seven day experimental period during October 2016 (heat stress period (HS), Thermal heat index (THI)=69.90 at7.00h and 80.14 at 14.00h) and on a single day in peak winter in December 2016 (control ‘C’, THI: 63.93 at 7.00h and 80.14 at 14.00h). Plasma albumin and globulin (g/dl) increased significantly on day 1 of HS from 07.00h to 14.00h & 16.00h. Plasma Lactate (mM/l) increased significantly at 14.00h & 16.00h as compared to 07:00h in both ‘HS’ and ‘C’. The lactate levels were significantly lower at the respective diurnal time points in period ‘C’. Urea (mg/dl) increased significantly (p< 0.05) at 14.00h & 16.00h when compared to its values at 07.00h & 10.00h on in ‘HS’. Maximum urea level was observed at 16.00h on day 1 of ‘HS’. During winter, although urea levels increased significantly at 10.00h, 14.00h & 16.00h from the values observed at 07.00h, the levels remained lower when compared to ‘HS’ at 14:00h and 16:00h. Similar trends were observed for plasma creatinine (mg/dl) which remained significantly higher in ‘HS’ than in ‘C’. The cholesterol decreased at 10.00h & 14.00h and again increased significantly (p
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