SYMPOSIA AND ORAL PRESENTATIONS Animal Health: Probiotics, Performance and Antioxidants

نویسندگان

  • M. A. Karimi Torshizi
  • A. Rahimi
چکیده

Thiamine deficiency causes a decrease in transketolase activity and an increase in thiamine pyrophosphate (TPP) effect on the erythrocytes. The objective of this experiment was to determine if ruminal acidosis alters erythrocytic transketolase enzyme activity as an indicator of thiamine level in feedlot cattle. A total of 65 feedlot cattle (1–2 years old) were fed either high concentrate diet (HCD, n = 50) or low concentrate diet (LCD, n = 15). The HCD group was fed a mixture of 75% cracked barley, 8% bran, 7% cotton seed meal and 10% straw for at least the last 3 mo, whereas the LCD group was fed a mixture of 30% cracked barley, 10% bran, 10% sugar beet pulp, 10% cotton seed meal and 40% straw. Rumen fluid samples of all cattle were obtained by rumenocentesis to determine ruminal pH. After ruminal samples were obtained, blood samples were collected from a jugular vein for erythrocytic transketolase enzyme activity using the Clausen’s colorimetric method. Mean pH values of ruminal fluid samples in the HCD and LCD groups were 5.3 and 6.1, respectively. The mean TPP effect % in the HCD group (47.16 ± 3.17) was significantly higher than in the LCD group (19.53 ± 2.51) (P < 0.01). Ruminants with functional rumen are considered to have no specific dietary thiamine requirement due to extensive thiamine synthesis by rumen microbes. Thiamine deficiency in both chronic ruminal acidosis and acute ruminal lactic acidosis may occur because of inadequate synthesis of thiamine, bacterial production of thiaminase in the acidotic ruminal fluid. Furthermore, a decrease in ruminal pH may result in the release of bacterial thiaminases. The present study demonstrated that thiamine deficiency could occur in ruminants fed under intensive fattening regimens.

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تاریخ انتشار 2010