Bovine tissue content of estrogenic compounds : impact of phytoestrogen-based diets /
| Main Author: | |
|---|---|
| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
|
| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | This study evaluated the amount of phytoestrogen accumulation occurring in bovine tissues due to the extended ingestion of phytoestrogenic feed. Sixty-four Angus steers were randomly assigned to one of four groups which received either a phytoestrogenic feed (Control) or a non-phytoestrogenic (A/S) feed, with half of each group implanted with Synovex-S. Eight steers from each group were slaughtered following 36 and 105 d on feed. On d 105, the remaining steers receiving the phytoestrogenic (A/S) diet continued on the control ration for 7 and 14 d prior to slaughter. Alfalfa and soybean meal (A/S) provided the phytoestrogenic potency of the phytoestrogenic diet. The steers receiving the A/S diet for 36 d and 105 d consumed a mean relative estrogenic potency per day of 5,932,980 and 6,622,689, respectively. The average daily gain (ADG) and the U.S. Yield Grades of the steers were not significantly different (P > .05) between the Control and the A/S groups. However, Synovex-S implants significantly increased (P < .05) the ADG of steers consuming both rations for 36 d compared to the steers fed for longer periods. No phytoestrogens were detected in any samples from steers fed the Control diet. Phytoestrogens were detected in the livers and kidneys of steers fed the A/S diet for 36 and 105 d. When the steers were withdrawn from the A/S diet, there were no phytoestrogens detected in the liver samples. Phytoestrogens were only detected in kidney-pelvic (KP) adipose tissue of 5 steers fed the A/S diet for 36 d. Plasma and urine samples collected following 14, 36 and 105 d on the A/S diet contained relatively high concentrations of phytoestrogens. Samples collected following 7 and 14 d withdrawal from the A/S diet fed for 105 d also exhibited phytoestrogens. No phytoestrogens were found in muscle or subcutaneous adipose tissues. These data suggest that phytoestrogens are present in the animals' blood, urine, kidney, liver and KP adipose tissue while they are consuming the phytoestrogenic feed. However, when the animals are withdrawn from the phytoestrogenic feed, the phytoestrogen levels in their bodies decline. |
|---|---|
| Item Description: | Typescript (photocopy). Vita. "Major subject: Food Science and Technology." |
| Physical Description: | xii, 99 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |