Changes in Serum Levels of LH, FSH, Prolactin, Testosterone, and Cortisol Associated with Season and Mating in Male Pygmy Goats

Howland, B. E.; Sanford, L. M.; Palmer, W. M.

doi:10.1002/j.1939-4640.1985.tb00822.x

Cited by 40 publications

(18 citation statements)

References 24 publications

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“…The significant decrease in PCV from pre-treatment to posttreatment is at variance with the finding of Eniolorunda et al (2006) who opined that Spondias mombin leaves fed to growing bucks for 63 days had no significant effect on PCV but their work was in agreement with the non-significant effect on WBC recorded in this work. At variance with this work, pronounced post-treatment testosterone concentration of 5.56 ± 4.72 ng/ml in this work was slightly higher than 5.00ng/ml recorded by Howland et al (1985) who worked around similar period of the year (August) on intact normal pygmy goats while still kept away from mating. These workers also recorded 40ng/ml as prolactin concentration for the pygmy goats which was higher than 10.74 ± 4.77ng/ml reported in this work for pre-treatment and 25.80 ± 41.50ng/ml for post-treatment.…”

Section: Discussioncontrasting

confidence: 70%

Haemogram and hormonal profile of WAD bucks treated with leaf ethanolic extract of <i>Spondias mombin</i>

Oloye¹,

Ola-Davies²,

Oyeyemi³

2017

Sokoto J. Vet. Sc.

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The goats had well-formed pendulous scrotum with well descended free bilateral testicles. The goats were kept in a standard goat pen and fed with fresh green centrosema leaves in the morning and commercially prepared ration in the evening. Water was served ad libitum. Pre-treatment haematological and hormonal profiling after aseptical collection of blood from the bucks was followed with 14 days of oral treatment with ethanol extract of Spondias mombin at the dosage rate of 800mg/kg BW. Post-treatment haematological and hormonal studies followed after. The hormones assayed were follicle stimulating hormone (FSH), luteinising hormone (LH), testosterone, progesterone, estrogen and prolactin. The haemogram revealed significantly (p < 0.05) higher PCV (24.33±0.6 %) in pre-treatment compared to 19.92± 1.1 % recorded for post-treatment. However, both were lower in values than normal range. WBC and RBC did not change significantly but while RBC values for pre-treatment and post-treatment fell within normal range, only the WBC value of post-treatment did. Assay of FSH, progesterone, estrogen and prolactin revealed no significant (p . 0.05) difference between pre-treatment and post-treatment; however, noticeable higher pre-treatment LH concentration and elevated post-treatment testosterone concentration were observed. The work showed that Spondias mombin at 800mg/kgBW has profertility tendencies in the buck and can be considered as an aphrodisiac in goat breeding in developing countries probably at a higher dosage.

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Section: Discussioncontrasting

confidence: 70%

Haemogram and hormonal profile of WAD bucks treated with leaf ethanolic extract of <i>Spondias mombin</i>

Oloye¹,

Ola-Davies²,

Oyeyemi³

2017

Sokoto J. Vet. Sc.

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“…There is no evidence, however, for elevated cortisol levels being connected to the high testosterone levels per se during the reproductively active period of male goats (Howland et al, 1985), sheep (Lincoln et al, 1982), or white-tailed deer (Bubenik et al, 1983), although a parallel acute rise of both hormones occurs during sexual and aggressive behavior (Howland et al, 1985;Liptrap and Raeside, 1978). On the contrary, in some studies higher cortisol levels in male deer have been found during the sexually inactive rather than the active period of the year (Bubenik et al, 1983;Ingram et al, 1999;Monfort et al, 1993).…”

Section: Discussionmentioning

confidence: 80%

“…The direction of the change and not the photoperiod as such seemed to affect the cortisol levels. We are aware only of one previous study that has addressed seasonal variations of goat serum cortisol concentrations (Howland et al, 1985). Four male pygmy goats were sampled each month of the year for 6 h at 20min intervals, and the samples were pooled for hormone measurements.…”

Section: Discussionmentioning

confidence: 99%

Serum Cortisol Levels in Goats Exhibit Seasonal But Not Daily Rhythmicity

Alila-Johansson

Eriksson

Soveri³

et al. 2003

Chronobiology International

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The aim of the study was to find out whether there is a daily rhythm in goat serum cortisol concentrations, whether the concentration profiles differ between normal light:dark and constant dark conditions, and whether any seasonal variations might be detected in daily cortisol secretion patterns. Seven Finnish landrace goats were kept at indoor temperature (18-23 degrees C) under artficial lighting that approximately simulated the annual changes of daylength at 60 degrees N. Blood samples were collected for cortisol measurements by radioimmunoassay at 2h intervals during six times of the year: winter (light:dark 6:18h), early spring (10:14h), late spring (14:10h), summer (18:6h), early fall (14:10h), and late fall (10:14h). Cortisol profiles were determined for two consecutive days, first in light:dark (LD) conditions and then in continuous darkness (DD). There was no significant daily rhythm in serum cortisol levels in any time of the year, nor did the profiles in LD and DD conditions show any differences. A significant seasonal variation was, however, detected among the overall cortisol levels. In winter, the concentrations were higher than in any other season, and from early spring to summer they were at their lowest. Under equal photoperiods, the cortisol levels were higher in fall than spring. The difference between winter and summer was confirmed the following year in LD conditions. There was on correlation between serum cortisol and progesterone levels. The results suggest that the possible circadian variation of cortisol secretion in goats is completely masked by external factors, and lighting conditions do not have immediate effects on the daily secretion patterns. The seasonal variation in the overall cortisol levels is most probably related to the changes in photoperiod, because other conditions were relatively constant during the experiment.

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“…This may reflect the different latitudes at which the two studies were done (40°N v. 50° 46') or the method used to assess testicular size; in the French study testicular volume was estimated using an orchidometer and the results subsequently converted to, and reported as, a testicular weight. Similarly, in a study involving four mature pygmy bucks over a 13-month period in southern Canada, Howland et al (1985) reported no seasonal influence on testis size or libido, despite there being significant changes in peripheral testosterone concentration, with the highest values recorded in the autumn. However, that study was based on data from six animals ranging in age from 10 months to 6 years and for a relatively short period of time viz.…”

Section: Discussionmentioning

confidence: 92%

Seasonal variations in testis size, libido and plasma testosterone concentrations in British goats

Ahmad

Noakes

1995

Anim. Sci.

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The effects of months and seasons of the year on the testis size, libido and plasma testosterone (T) concentrations -were studied in 10 young sexually mature male goats over a 12-month period. Testis size was expressed in terms of scrotal circumference, testis diameter and paired testes width while the libido was measured as stimulation and reaction times,number of mounts and services, and libido index. These measurements were recorded fortnightly. The body weight increased from 33-5 (s.e. 0-95) kg in October, to a maximum of 62-8 (s.e. 1-55) kg in July. All parameters of testis size decreased from October through January with a sharp increase noted in July and August. These parameters were significantly higher in the summer and autumn than in the winter and spring (P < 0-01). The libido in the goats increased from October to a maximum in December, declined gradually to reach the minimum in July, and then improved again in August. Thus, libido was lowest during the summer and highest in winter, the difference being significant (P<0-01). Plasma T concentrations were high during October, with the lowest values noted in June. An increase in the T concentrations was observed in August, reaching the maximum value in September, the difference being significant (P < 0-01). The T concentrations were significantly higher during autumn than in all other seasons (P < 0-01).

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Changes in Serum Levels of LH, FSH, Prolactin, Testosterone, and Cortisol Associated with Season and Mating in Male Pygmy Goats

Cited by 40 publications

References 24 publications

Haemogram and hormonal profile of WAD bucks treated with leaf ethanolic extract of <i>Spondias mombin</i>

Haemogram and hormonal profile of WAD bucks treated with leaf ethanolic extract of <i>Spondias mombin</i>

Serum Cortisol Levels in Goats Exhibit Seasonal But Not Daily Rhythmicity

Seasonal variations in testis size, libido and plasma testosterone concentrations in British goats

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