Opioid modulation of LH secretion during the oestrous cycle of heifers
نویسندگان
چکیده
منابع مشابه
The effect of prostaglandin F2 alpha during various stages of the oestrous cycle of beef heifers.
The effects of prostaglandin F2\g=a\on peripheral plasma progesterone and oestrogen levels, incidence of oestrous cycle alteration, and fertility were examined in thirty beef heifers. The PGF2\g=a\was administered by insertion of an insemination pipette into the lumen of the uterus during three periods of the oestrous cycle: Days 3 to 5, Days 9 and 10, and Days 16 and 17. Oestrus occurred withi...
متن کاملChanges in LH Pulsatility Profiles in Dairy Heifers During Exposure to Oestrous Urine and Vaginal Mucus
Difficulty in observing oestrus is a problem for many dairy farmers performing AI. Finding ways to synchronize oestrous cycles or strengthen display of oestrus without hormonal treatments would be of great interest because many consumers object to the use of exogenous hormones on healthy animals. Modification of reproductive cycles through chemical communication has been reported in several spe...
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in the present study, the effect of e-64 at different concentrations (0.5, 1, 5 and 10 µm) added to (1) the ivm medium on oocyte nuclear maturation and developmental competence of ovine oocytes, and (2) to the ivc medium on embryonic development of ovine embryos were investigated.
Plasma concentrations of LH, progesterone and oestradiol during the oestrous cycle in swamp buffaloes (Bubalus bubalis).
Plasma concentrations of LH, progesterone and oestradiol were measured in 5 cyclic swamp buffaloes. Progesterone levels began to increase after Day 5 (Day 0 = the day of oestrus) and reached a plateau after Day 10. A rapid decrease in progesterone levels occurred during the 5 days before oestrus, followed by a sustained increase in oestradiol concentrations. Basal LH levels decreased towards th...
متن کاملHistomorphometrical study of the cervix during the oestrous cycle in adult Azarbaijan buffalo
In this study, genital tracts of 20 healthy non-pregnant buffaloes were collected from Urmia abattoir.These genital tracts were selected based on their ovaries conditions, half of them were in follicular phase and the other half were in luteal phase. The samples were taken from anterior, middle and posterior regions of the cervix and fixed in 10% buffer formalin. Then, histological sections of ...
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ژورنال
عنوان ژورنال: Reproduction
سال: 1987
ISSN: 1470-1626,1741-7899
DOI: 10.1530/jrf.0.0800213