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Regulation of gonadotropin-releasing hormone and gonadotropin in goldfish, carassius auratus /Lee, Kai-yan. January 1996 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1997. / Includes bibliographical references (leaf 119-120).
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Σύνθεση και βιολογική δράση ανάλογων της GnRH (Gonadotropin Releasing Hormone) με υποκατάσταση στις θέσεις 5,6,9 : εφαρμογές στην αναπαραγωγήΚεραμύδα, Μαρία Κ. 30 July 2010 (has links)
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Σχεδιασμός, ανάπτυξη & έλεγχος νέων συνθετικών αναλόγων του ενεργού φαρμακευτικού συστατικού λεουπρορελίνηΖώμπρα, Αικατερίνη 27 September 2010 (has links)
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Structure and function of gonadotropin-releasing hormone in the Thai catfish, Clarias macrocephalusNgamvongchon, Somsri 06 July 2018 (has links)
Two forms of gonadotropin-releasing hormone (GnRH) were
extracted from brain-pituitary tissues of two species of
Thai catfish, Clarias inacrocephalus and C. batrachus.
The peptides were detected using high-performance liquid
chromatography (HPLC) and radioimmunoassay (RIA), The
amino acid sequences of both forms were determined using
Edman degradation. One form of GnRH in the brain-pituitary
tissues of the Thai catfish was novel, whereas
the second form of GnRH was identical to chicken GnRH-XI.
The presence of the N-terminal pGlu residue in both
peptides was established by digestion with pyroglutamyl
aminopeptidase. In addition, catfish GnRH-I was studied
by mass spectrometry.
The localization of these two peptides was determined
to be in the discrete brain areas and in the pituitary of
female and male catfish, C. macrocaphalus, using
heterologous and homologous radioimmunoassays. Initially
a heterologous RIA was used with mammalian GnRH as
iodinated tracer and standard, and an antiserum made
against salmon GnRH. Catfish GnRH-I (novel form) was
found in most areas of the female and male brain with the
highest content and concentration in the female pituitary
and in the male hypothalamus,, Catfish GnRH-II (chicken
GnRH-II) was found with the highest content in the female
Cerebellum and highest concentration in the pituitary,
catfish GnRH-II (chicken GnRH-II) was found with the
highest content and concentration for males in the same
area, hypothalamus. Additionally, a homologous RIA was
used with catfish GnRH-II (chicken GnRH-II) as iodinated
tracer and standard, and an antiserum prepared against
chicken GnRH-II. Catfish GnRH-II was detected with the
highest content and concentration in the cerebellum of
both sexes. These values are higher than the results
obtained in the heterologous assay. The location of
catfish GnRH-I suggests that it plays a role in
regulating the release of gonadotropin from the pituitary
since the high content and concentration of this
immunoreactive GnRH are detected in the hypothalamus and
pituitary gland. In contrast, catfish GnRH-II may act as
a neurotransmitter in the catfish brain, in particular in
tha cerebellum where a high content and concentration of
immunoreactive GnRH are detected.
Physiological in vivo studies indicate that catfish
GnRH-II is more effective than catfish GnRH-I and other
forms of GnRH such as mammalian and dogfish GnRH for
induction of ovulation in catfish, C. macrocephalus.
Eight GnRH analogs had varying potencies for the
induction of ovulation, but the most effective forms were
two forms of catfish GnRH-II (chicken GnRH-II) modified
in positions six and ten. In vitro studies found that
catfish GnRH-I not only causes the release of
gonadotropin but also the release of growth hormone in a
dose-dependent manner.
The primary structures of the two catfish GnRH peptides
are important for understanding the evolution of this
family peptide. The novel catfish GnRH shows that only
positions 5, 7 and 8 vary in the GnRH molecule in jawed
vertebrates, whereas catfish GnRH-II provides direct
evidence that the structure of this GnRH is conserved in
teleosts. / Graduate
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Evaluation of systematic breeding programs in lactating dairy cowsJobst, Shelly Marie 20 November 1998 (has links)
Observing cows in estrus and inseminating them at the optimal time are necessary steps for effective reproductive management of a dairy herd. However, increasing herd sizes can lead to reproductive inefficiency resulting in decreased profits on dairy herds. Synchronization of estrus, through pharmacological control, has been used to improve reproductive efficiency. Systematic breeding programs provide an organized approach for administering artificial insemination (AI) at first service. Moreover, reproductive management is based on a methodical approach for the entire herd rather than for the individual cow. Seven-hundred and thirty four Holstein cows from 16 commercial dairy herds were used to conduct this study evaluating three systematic breeding protocols; 14-d PGF2a, timed AI (TAI), and GnRH-PGF2α, in comparison with an untreated control group. Eight herds relied on visual observation as their primary method for detection of estrus, and 8 herds utilized the HeatWatch® (DDx, Inc., Denver, CO) electronic estrus detection system. The average days to first postpartum AI were longer for untreated control cows when compared to the other breeding protocols. First AI conception rates did not differ among control, 14-d PGF2a, or GnRH-PGF2a protocols, but were higher than the TAI protocol. However, first AI pregnancy rates were higher for untreated controls versus hormonally treated cows. Estrus characteristics associated with each protocol were also evaluated and no difference was detected across treatments. An economic analysis determining cost per pregnancy for each protocol when considering drug costs, and pregnancy rates, resulted in the highest cost per pregnancy for TAI followed by GnRH-PGF2a and 14-d PGF2a. These programs should be considered as tools for convenience and efficiency of estrus detection; however, reduced labor costs from less time spent on estrus detection may be offset by the cost of the drug protocols. Cost effectiveness must be calculated on an individual herd basis when deciding whether a systematic breeding program is the appropriate choice. / Master of Science
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Regulation of gonadotropin secretion in the rat : role of ovarian inhibin /Condon, Timothy Peter January 1981 (has links)
No description available.
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Interaction of biogenic amines and sex steroids in the modulation of gonadotropin secretion /Dickey, Richard P. January 1970 (has links)
No description available.
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Serum testosterone and androstenedione levels in cattle and rats at various ages and response of rats to human chorionic gonadotropin /Singal, Sat Parkash January 1974 (has links)
No description available.
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Attempts to induce puberty in beef heifers with luteinizing hormone-releasing hormoneSkaggs, Chris L. January 1984 (has links)
Call number: LD2668 .T4 1984 S585 / Master of Science
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Effect of GnRH, breeding weight, frame, condition and age on pregnancy rates in estrus synchronized beef heifersFerguson, Mary. January 1985 (has links)
Call number: LD2668 .T4 1985 F47 / Master of Science
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