Seasonal variations in rete testis fluid secretion and sperm production in different breeds of ram

Dacheux, J.L.; Pisselet, C.; Blanc, Michel; Hochereau‐De‐Reviers, M.T.; Courot, M.

doi:10.1530/jrf.0.0610363

Cited by 61 publications

(22 citation statements)

References 10 publications

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“…This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. doi:10.1017/S1751731117001045 animal and dramatically reduced sperm production in the male (Dacheux et al, 1981). This cycle, modulated by melatonin secretion, is under strong photoperiodic control (Karsch et al, 1984;Malpaux et al, 1997;Thiéry et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Animal Board Invited Review: Sheep birth distribution in past herds: a review for prehistoric Europe (6th to 3rd millennia BC)

Balasse

Tresset

Bălășescu³

et al. 2017

Animal

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In temperate latitudes sheep have a seasonal reproductive behaviour, which imposes strong constraints on husbandry in terms of work organization and availability of animal products. During the last 50 years, researchers have focused on understanding the mechanisms driving small ruminants' reproduction cycles and finding ways to control them. This characteristic is inherited from their wild ancestor. However, the history of its evolution over the 10 millennia that separates present day European sheep from their Near Eastern ancestors' remains to be written. This perspective echoes archaeologists' current attempts at reconstructing ancient pastoral societies' socio-economical organization. Information related to birth seasonality may be retrieved directly from archaeological sheep teeth. The methodology consists of reconstructing the seasonal cycle record in sheep molars, through sequential analysis of the stable oxygen isotope composition (δ 18 O) of enamel. Because the timing of tooth development is fixed within a species, inter-individual variability in this parameter reflects birth seasonality. A review of the data obtained from 10 European archaeological sites dated from the 6th to the 3rd millennia BC is provided. The results demonstrate a restricted breeding season for sheep: births occurred over a period of 3 to 4 months, from late winter to early summer at latitudes 43°N to 48°N, while a later onset was observed at a higher latitude (59°N). All conclusions concurred with currently held expectations based on present day sheep physiology, which, aside from the historical significance, contributes to the reinforcing of the methodological basis of the approach. Further study in this area will permit regional variability attributable to technical choices, within global schemes, to be fully reported.

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Section: Introductionmentioning

confidence: 99%

Animal Board Invited Review: Sheep birth distribution in past herds: a review for prehistoric Europe (6th to 3rd millennia BC)

Balasse

Tresset

Bălășescu³

et al. 2017

Animal

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“…Furthermore, spermatogenesis has been shown to change with photoperiod [7, 10, I S]. Seasonal variations in daily sperm production [7] and semen characteristics have also been observed, the best semen generally being obtained in the winter [2,14]. It has been shown that photoperiod has an important effect on production of ejaculated sperm and fertility in rams [3].…”

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confidence: 99%

“…In addition, feeding and environmental temperature (according to latitude) may modulate photoperiod effects [10,[19][20][21]. Finally, seasonal effects have been shown to differ among breeds [7,17,24,27]. Testosterone was measured by RIA using an anti-T-3-O-carboxymethyloxime-bovine serum albumin antiserum with a previous ether extraction of experimental sera, as described previously [29].…”

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Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds

et al. 1999

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“…Breed differences in susceptibility to photoperiodic changes constitute another source of seasonal variation in sheep reproductive activity. Important differences between breeds have been reported in the timing and magnitude of the seasonal testicular cycle [2], in the seasonal pattern of secretion of gonadotrophins [3,4] and in the seasonality of testicular activity and sperm production [5][6][7][8]. Rams of the "northern breeds" have a marked seasonal reproductive cycle, which is mainly influenced by photoperiodic variation [9].…”

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confidence: 99%

Influence of Nutrition on Seasonal Variations in Testicular Morphology and Function in Corriedale Rams.

Bielli

Gastel

Pérez

et al. 1997

Journal of Reproduction and Development

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Abstract. To test the hypothesis that seasonal variations in testicular morphology and function differ in Corriedale rams subject to different feeding levels, 24 spring-born Corriedale rams, aged 14-15 months at the beginning of the trial and raised under extensive grazing conditions in Uruguay, were allotted at random to two groups: Group H, that grazed on improved (sown) pastures, and Group L, the control, that grazed on natural pastures (range). Clinical data (live weight, scrotal circumference), semen, blood and tissue samples (testis, epididymis and seminal vesicle) were collected during each of four seasons (for one month/season) of the year. According to data measured, testicular form and function had its peak in autumn followed by a decline in winter and a subsequent recovery in spring and summer. Live weight loss during winter was significantly decreased in Group L but not in Group H. Scrotal circumference, seminiferous tubules diameter and seminal vesicle epithelial height decreased significantly during winter in both groups. Group H scrotal circumference returned earlier (spring) than Group L (summer) to autumn values. By summer, seminiferous tubules and seminal vesicle epithelial height had returned to autumn values in Group H, but not in Group L. Decrements of scrotal circumference in winter and spring were milder in Group H than in Group L animals. Group H testosterone values in autumn were higher than those from Group L in spring. In summary: 1) differences existed in seasonal variations in testicular morphology and function between Corriedale rams subjected to different feeding levels and, 2) the findings suggest that nutritional factors contributed, at least partly, to the differences in variations observed throughout the experiment. Key words: Rams, Testis, Seasonality, Nutrition, Morphology.(J. Reprod. Dev. 43: [171][172][173][174][175][176][177][178][179][180] 1997) ale sheep reproduction is seasonal. However, the degree of seasonality in male sheep factors. The most important cue for rams reproductive seasonal variations in cold-temperate regions is the annual cycle of increasing and decreasing photoperiod. The magnitude of the change in daylength among seasons varies widely depending on the latitude. Nutrition is another M reproduction varies, depending on a number of

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Seasonal variations in rete testis fluid secretion and sperm production in different breeds of ram

Cited by 61 publications

References 10 publications

Animal Board Invited Review: Sheep birth distribution in past herds: a review for prehistoric Europe (6th to 3rd millennia BC)

Animal Board Invited Review: Sheep birth distribution in past herds: a review for prehistoric Europe (6th to 3rd millennia BC)

Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds

Influence of Nutrition on Seasonal Variations in Testicular Morphology and Function in Corriedale Rams.

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