Effects of induced hypothyroidism on ovarian response to superovulation of Brahman (Bos indicus) cows /
(P<.05) in PTU than in C by d 28 of treatment and remained
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (P<.05) in PTU than in C by d 28 of treatment and remained (Superov') over a 3-d period. Estrus was induced by administration of PGF20C. Artificial insemination was adrenal function and increased ovarian response to FSH in after insemination, collection of embryos by non-surgical and lower (P<.l) percentage of blastocysts collected than animal received 1.8 kg of a 5.-l corn-soybean meal average daily gain, greater (P<.05) paired ovarian weights, body condition score (BCS) to dietary treatments containing Coastal bermudagrass hay were available free choice and each concentrate daily. Dietary treatments began on d 10 of the corpora lutea than C. Concentration of P4 per g of luteal cows received daily i.m. injections of 25 IU of porcine FSH cows were hypothyroid (H-PTU) and four were partially either 0 (C; n=10) or 4 mg/kg BW/d 6-npropyl-2-thiouracil estrous cycle. Ten d after the second standing estrus, the greater (P<.06) amount of luteal tissue, greater (P<.06) have affected fertility. Ovulation and P4 release appeared hypothyroidism improved weight gain and BCS, did not affect low thereafter. Based on T4 concentrations on d 49, five mid-flank laparotomy. Blood samples were collected on a mixed with the concentrate (PTU- n=10). Water, minerals and Multiparous nonlactacting Brahman cows (n=20) exhibiting normal estrous cycles were randomly assigned within BW and number of large follicles (>4 mm), lower (P<.001) embryo of luteinized follicles and a greater (P<.05) number of performed at 12 and 24 h after observed estrus. Seven d procedures was performed and the ovaries were removed via ratio of luteal to serum P4 on d 7 was greater (P<.l) in PTU. recovery rate, lower (P<.l) percentage of fertilized embryos, Serum concentration of cortisol did not differ (P>.l) between superovulated Brahman cows. Enhanced ovarian response may suppressed (P-PTU). Cows in the PTU group had greater (P<.l) those in C. Further, H-PTU cows had a greater (P<.06) number tissue did not differ (P>.l) between treatments, but the to be impaired in hypothyroid Brahman cows. treatment groups. It was concluded that induced triiodothyronine and thyroxine (T4) concentrations were lower weekly basis and the d of embryo collection. Serum |
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| Item Description: | "Major subject: Physiology of Reproduction". Vita. |
| Physical Description: | xiii, 103 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references: pages 83-100. |