Regulation of in vitro progesterone release from caprine luteal tissues by prostaglandins E2 and F2a

Akinlosotu, B.A.; Guraya, G.

doi:10.1016/0093-691x(92)90218-g

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…Also, it should be considered that PGF 2␣ could affect steroid biosynthesis. It has been shown that PGF 2␣ is involved in the up-regulation of steroid biosynthesis in alpaca Leydig cells [35] and also inhibits the release of progesterone in caprine luteal tissues [36]. This action on luteal cell steroid production could also occur in felids, which may explain the gradual decline in peripheral progesterone concentrations in the cat during the last pregnancy weeks-a decrease which does not appear compensated by the placenta [37].…”

Section: Discussionmentioning

confidence: 93%

Using PGFM (13,14-dihydro-15-keto-prostaglandin F2α) as a non-invasive pregnancy marker for felids

et al. 2012

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Section: Discussionmentioning

confidence: 93%

Using PGFM (13,14-dihydro-15-keto-prostaglandin F2α) as a non-invasive pregnancy marker for felids

et al. 2012

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Prostaglandin E2 levels in uterine tissues and its relationship with uterine and luteal progesterone during the estrous cycle in dairy cows

Cerbito

Miyamoto

Balagapo³

et al. 1994

Theriogenology

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Assessment of Sperm Morphology in Zebu Bulls, under Field Conditions in the Tropics

Chacón

2001

Reprod Domestic Animals

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Sperm morphology was studied in 302 extensively managed Zebu bulls (aged 1.5-9 years), classified as sound (n=166) or unsound (n=136) for breeding, under field conditions in the dry tropics of Costa Rica. Single semen samples were collected by electro-ejaculation and fixed in formol-saline solution immediately after collection. Sperm morphology was determined in the field on wet smears using a microscope equipped with phase-contrast optics, and further determined in the laboratory on air-dried smears stained with carbol-fuchsin. The frequencies of sperm abnormalities (such as abnormal acrosome, head, neck, mid-piece, tail, and presence of cytoplasmic droplets) were recorded as a percentage of the total number of counted spermatozoa (400 cells). Zebu bulls considered unsound for breeding showed a higher mean prevalence (p < 0.05) of knobbed acrosomes (4.0 versus 0.9%), head defects [specifically, nuclear invaginations and heads with abnormal shapes and sizes (27.6 versus 4.0%)], abnormal tails (11.2 versus 4.7%), and proximal droplets (8.4 versus 1.6%), compared with bulls considered sound for breeding. In these latter bulls, the abnormality most commonly seen was the presence of single bent tails with an entrapped cytoplasmic droplet (3.0 +/- 3.7%). Young Zebu bulls (i.e. bulls under 2 years of age) showed a higher percentage of missing acrosomes, and proximal cytoplasmic droplets, than older sires (12.1 versus 2.4%, and 23.9 versus 3.6%, respectively; p < 0.05), interpreted as an indication of low ejaculation frequency and sexual immaturity, respectively. Bulls with a long scrotum and soft testicular consistency (TC) at palpation showed higher percentages of abnormal sperm heads in the ejaculate than bulls with a normal scrotal length (SL) and a normal TC (32.7 versus 12.8% and 30.7 versus 10.3%, respectively; p < 0.05). In addition, Zebu bulls with a scrotal circumference (SC) < or = 30 cm showed a higher prevalence of proximal cytoplasmic droplets than bulls whose SC was > 30 cm (9.8 versus 2.6%, p < 0.05). A higher mean percentage of abnormally sized and shaped heads, especially undeveloped and narrow at the base, was more frequently found in stained smears than in unstained samples (26.0 versus 9.9%, p < 0.05), which clearly underlines the importance of using both stained and wet smears when assessing sperm head morphology. However, for a quick assessment of sperm morphology under field, tropical conditions, phase-contrast microscopy provides useful information for the spermiogramme evaluation.

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Regulation of in vitro progesterone release from caprine luteal tissues by prostaglandins E2 and F2a

Cited by 4 publications

References 22 publications

Using PGFM (13,14-dihydro-15-keto-prostaglandin F2α) as a non-invasive pregnancy marker for felids

Using PGFM (13,14-dihydro-15-keto-prostaglandin F2α) as a non-invasive pregnancy marker for felids

Prostaglandin E2 levels in uterine tissues and its relationship with uterine and luteal progesterone during the estrous cycle in dairy cows

Assessment of Sperm Morphology in Zebu Bulls, under Field Conditions in the Tropics

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