Bovine sex hormone binding globulin (SHBG) : relationship of binding capacity of SHBG in plasma with reproductive state, diet and steroid hormones /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1989.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | The binding capacity of SHBG in the bovine was studied with the use of a one-point binding assay. In prepubertal Holstein heifers SHBG decreased from 2.49 μg/dl at 6 to 2.24 μq/dl at 11 mo of age. Puberty occurred at 383±10 d. During the estrous cycle, no relation was observed between SHBG concentration [SHBG] and estradiol [e₂] or [SHBG] and day of the estrous cycle. During pregnancy in nulliparous beef heifers of two biological types, [SHBG] in Red Poll-(small) and Charolais-crossbred (large) decreased from 3.49 μq/dl at 90 d of gestation to 2.68 μq/dl at parturition and increased to 3.94 μg/dl at 35 d postpartum. Dams carrying female feti had lower [SHBG] and progesterone than their counterparts with male feti. Feeding of saponified fatty acids (FA) (10% of diet) to dairy heifers in a cross-over design did not affect plasma concentration of non-esterified fatty acids [NEFA]. During the first period [SHBG] was greater in control heifers (1.86 vs 2.15 μg/dl) and during the second period FA-fed heifers had greater [NEFA] (193 vs 251 μEq/1). No relation was noted between plasma androgen and [SHBG]. Sex hormone binding globulin concentration declined in range beef cows and heifers during a 75 d breeding period (3.18 to 2.25 in cows and 2.82 to 2.24 μg/dl in heifers).. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Physiology of Reproduction." |
| Physical Description: | xiv, 144 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |