abstract：:The separate and combined effects of Synovex-S (SYN) ear implants and thyroxine (T4)-5'-monodeiodinase inhibition (Trial 1) and T3 injection to create a mild elevation in circulating T3 concentrations (Trial 2) on BW gain and composition of gain were studied. Trial 1 used 24, 285-kg Angus steers in two experimental ph...

journal_title：Domestic animal endocrinology

authors： Rumsey TS,Elsasser TH,Norton SA,Kozak AS,Kahl S

更新日期：1992-07-01 00:00:00

abstract：:Experiments were conducted to determine if a nocturnal rise in serum melatonin occurs in prepubertal gilts and whether acute exposure of gilts to light during the dark period abruptly reduces serum concentrations of melatonin. In experiment 1, 12 prepubertal crossbred gilts (Duroc x Hampshire x Chester White x Yorkshi...

journal_title：Domestic animal endocrinology

authors： Diekman MA,Brandt KE,Green ML,Clapper JA,Malayer JR

更新日期：1992-04-01 00:00:00

abstract：:Mature Hereford cows (n = 28) were used to determine the effect of percentage body fat on secretion of LH and content of GnRH in the infundibular stalk-median eminence (ISME). Cows were fed to maintain, lose, or gain weight to achieve body condition scores (BCS; 1 = emaciated; 9 = obese) of 3 to 7. Then cows were fed ...

journal_title：Domestic animal endocrinology

authors： Rasby RJ,Wettemann RP,Harms PG,Lusby KS,Wagner JJ

更新日期：1992-01-01 00:00:00

abstract：:The aim of the experiment was to determine the acute and chronic effects of the beta-agonist, cimaterol, on plasma hormone and metabolite concentrations in steers. Twelve Friesian steers (liveweight = 488 +/- 3 kg) were randomly assigned to receive either 0 (control; n = 6) or .09 mg cimaterol/kg body weight/day (trea...

journal_title：Domestic animal endocrinology

authors： Chikhou F,Moloney AP,Austin FH,Roche JF,Enright WJ

更新日期：1991-10-01 00:00:00

abstract：:Canine thyroglobulin (cTg) has been isolated and purified. It has similar electrophoretic patterns as Tg from other mammalian species. The main fraction had a MW of 660,000, whereas also fractions of a MW of approximately 1,300,000 (dimer) and 330,000 (subunit) were present. The iodine content was 0.8 to 1.0% (w/w). c...

journal_title：Domestic animal endocrinology

authors： Verschueren CP,Selman PJ,de Vijlder JJ,Mol JA

更新日期：1991-10-01 00:00:00

abstract：:The site within the hypothalamic-pituitary axis at which cortisol acts to inhibit luteinizing hormone (LH) secretion was investigated in female pigs. Six ovariectomized, hypophysial stalk-transected (HST) gilts were given 1 microgram pulses of gonadotropin releasing-hormone (GnRH) iv every 45 min from day 0 to 12. On ...

journal_title：Domestic animal endocrinology

authors： Estienne MJ,Barb CR,Kesner JS,Kraeling RR,Rampacek GB

更新日期：1991-07-01 00:00:00

abstract：:Effects of ewe body condition and level of feed intake on ovarian follicle populations and ovulation rates were studied in three groups of 12 to 15 Finnish Landrace cross ewes. Ewes were fed to achieve target body condition scores of either 2.0 (low, LM) or 2.5 (moderate, MM) and then fed a complete pelleted ration fo...

journal_title：Domestic animal endocrinology

authors： Rhind SM,Schanbacher BD

更新日期：1991-04-01 00:00:00

abstract：:An attenuated ovulatory rise in circulating concentrations of LH is characteristically associated with the first seasonal reproductive cycle of horse mares. Unlike ovulations (OV) of subsequent estrous cycles, the first OV of the breeding season (OV1) is not preceded by elevated concentrations of progesterone (PROG). ...

journal_title：Domestic animal endocrinology

authors： Silvia PJ,Fitzgerald BP

更新日期：1991-04-01 00:00:00

abstract：:Plasma corticosteroid concentrations are altered in pregnancy, during the reproductive cycle and by ovariectomy in many species. This study was designed to examine basal ACTH and cortisol in ewes of four different reproductive statuses: ovariectomized, nonpregnant cycling, nonpregnant noncycling, and pregnant. Blood s...

journal_title：Domestic animal endocrinology

authors： Bell ME,Wood CE,Keller-Wood M

更新日期：1991-04-01 00:00:00

abstract：:Fifteen cows (87 +/- 8 d in lactation; 641 +/- 33 kg BW) were randomly assigned to treatment and then subjected for 182 d to daily sc injection (1000 hr), in the cervical area, of saline (control), thyrotropin-releasing factor (TRF: 1 micrograms/kg BW), growth hormone-releasing factor (1-29)NH2 (GRF; 10 micrograms/kg ...

journal_title：Domestic animal endocrinology

authors： Lacasse P,Petitclerc D,Pelletier G,Delorme L,Morisset J,Gaudreau P,Brazeau P

更新日期：1991-01-01 00:00:00

abstract：:In Experiment 1, voided urine samples were collected from 12 adult dogs at 0500, 1400, and 2200 hr for 4 days. Cortisol was measured in unextracted urine by radioimmunoassay, creatinine by spectrophotometry, and the cortisol/creatinine ratio (UCCR) was calculated for each sample. There was considerable variation both ...

journal_title：Domestic animal endocrinology

authors： Jones CA,Refsal KR,Lippert AC,Nachreiner RF,Schwacha MM

更新日期：1990-10-01 00:00:00

abstract：:In vitro release of progesterone (P4) and estrone (E1) by the porcine placenta was characterized at 12 days of gestation between d 20 and 110. Placental P4 rose linearly from d 25 to 40, plateaued between d 40 and 50, continued to increase to a peak concentration at d 100, then decreased sharply to d 110. Placental E1...

journal_title：Domestic animal endocrinology

authors： Knight JW,Kukoly CA

更新日期：1990-10-01 00:00:00

abstract：:Our objective was to examine the ability of thyroid releasing hormone (TRH) to stimulate not only the release of the thyroid hormones, but also prolactin (PRL) in the female pig. An experiment was conducted to determine the effect of dose and route of administration of TRH on the concentration of PRL and thyroxine (T4...

journal_title：Domestic animal endocrinology

authors： Stuber DC,Johnson CL,Green CA,McLaren DG,Bahr JM,Easter RA

更新日期：1990-07-01 00:00:00

abstract：:Mammary secretions obtained from four groups of sows at parturition and on days 7, 14 and 21 of lactation were defatted and assayed for total protein and insulin-like growth factor-I (IGF-I). Sows (n = 57) represented two breeds (Landrace and Duroc) and two genetic lines (selected for differences in sow productivity i...

journal_title：Domestic animal endocrinology

authors： Simmen FA,Whang KY,Simmen RC,Peterson GA,Bishop MD,Irvin KM

更新日期：1990-04-01 00:00:00

abstract：:GnRH has several direct actions on rat granulosa cells. Specific receptors for GnRH have been demonstrated on rat and human ovaries. Whether the porcine ovary has specific receptors for GnRH is still debated and the physiological actions of GnRH on porcine granulosa cells have not yet been clarified. Consequently, we ...

journal_title：Domestic animal endocrinology

authors： Ledwitz-Rigby F

更新日期：1990-04-01 00:00:00

abstract：:The objective of transgenic livestock improvement projects is to develop and bring to market superior breeding stock, as well as germplasm for the artificial insemination and embryo transfer industries. Livestock animal biotechnology programs hold the promise of achieving, in a single generation, improvements in comme...

journal_title：Domestic animal endocrinology

authors： Pinkert CA,Dyer TJ,Kooyman DL,Kiehm DJ

更新日期：1990-01-01 00:00:00

abstract：:The effects of estrogen and fasting on hepatic metabolism were studied by an arteriovenous difference technique in six multicatheterized ewes. In each experiment samples were collected during fed and 3- and 5-day fasted states before, and 10 to 17 days after the animals had been implanted with 550 mg of estradiol-17 b...

journal_title：Domestic animal endocrinology

authors： Kerr DE,Chaplin RK,Laarveld B

更新日期：1988-04-01 00:00:00

abstract：:The three biologic activities most commonly associated with tumors that produce Humoral Hypercalcemia of Malignancy (HHM) include; 1) adenylate cyclase stimulating activity (PTH-like activity), 2) in vitro bone resorbing activity, and 3) transforming growth factor activity. The canine adenocarcinoma (CAC-8) model of H...

journal_title：Domestic animal endocrinology

authors： Rosol TJ,Capen CC

更新日期：1988-01-01 00:00:00

abstract：:The effects of somatostatin immunoneutralization on growth rate, growth hormone (GH) secretion and circulating insulin-like growth factor I (IGF-I) concentrations were investigated in chickens through the use of passive and active immunization techniques. Intravenous bolus injection of goat-antisomatostatin stimulated...

journal_title：Domestic animal endocrinology

authors： Buonomo FC,Sabacky MJ,Della-Fera MA,Baile CA

更新日期：1987-07-01 00:00:00

abstract：:In the present study we examined the influence of castration and exogenous estradiol on pulsatile LH release during the transition from infancy to the prepubertal period of development. Bull calves were assigned to treatments (N = 5 treatment) at 6 weeks of age. Treatments consisted of intact controls, castrates and c...

journal_title：Domestic animal endocrinology

authors： Wise ME,Rodriguez RE,Kelly CM

更新日期：1987-07-01 00:00:00

abstract：:The regional distribution and relative concentrations of LHRH and beta-endorphin immunoreactivity in the hypothalamus were compared in sexually active and sexually inactive Soay rams. LHRH was localized principally in the medial basal hypothalamus and median eminence with lower concentrations in the anterior hypothala...

journal_title：Domestic animal endocrinology

authors： Ebling FJ,Lincoln GA,Martin GB,Taylor PL

更新日期：1987-07-01 00:00:00

abstract：:Effects of domperidone, a peripheral dopamine receptor antagonist, on secretion of LH and prolactin were studied during the luteal phase and following administration of PGF2 alpha. Since hyperprolactinemia has been reported to inhibit secretion of LH in ewes, effects of thyrotropin-releasing hormone (TRH) also were ex...

journal_title：Domestic animal endocrinology

authors： Deaver DR,Keisler DH,Dailey RA

更新日期：1987-04-01 00:00:00

abstract：:A heterologous radioimmunoassay system was validated for the determination of IGF1 concentrations in swine sera. Parallelism, accuracy and response to physiological stimuli were obtained following the incubation of serum samples with 1M glycine-glycine HC1 buffer at a pH of 3.5 +/- 0.2 for 24 hours at 37C. Following a...

journal_title：Domestic animal endocrinology

authors： Buonomo FC,Lauterio TJ,Baile CA,Campion DR

更新日期：1987-01-01 00:00:00