2018
DOI: 10.4025/actascianimsci.v40i1.39908
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Abstract: The objective of this study was to characterize the reproductive cycle both endocrinologically and behaviorally in ewes. Blood samples were analyzed by EIA for progesterone (P 4 ), and RIA for estradiol in order to determine the breeding strategy of non-pregnant (n = 11) and pregnant (n = 9) White Karaman throughout the year in the Middle Anatolia (39.57 0 N, 32.53 0 W), Turkey. Estrous cycle lengths and estrous lengths were 18.36 ± 1.03 days and 35.16 ± 5.95 hours, respectively. The breeding season durations … Show more

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Cited by 6 publications
(6 citation statements)
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“…In the present study, we observed low E2 production (~ 1 ng/ml) on 15th day after mating in both groups (p>0.05, Figure 2). Similar results were observed by Arsoy and Sağmanlıgil (2018), who worked with white Karaman ewes, and reported a decrease in the serum concentrations of E2 to its minimum level at 15th day of the cycle (0.35 ± 0.15 ng/ mL). Additionally, another study verified that during the luteal phase, E2 concentrations were variable and there was a sharp decrease (p<0.05) from day 16 to 17 (Bartlewski et al, 1999).…”
Section: Resultssupporting
confidence: 88%
“…In the present study, we observed low E2 production (~ 1 ng/ml) on 15th day after mating in both groups (p>0.05, Figure 2). Similar results were observed by Arsoy and Sağmanlıgil (2018), who worked with white Karaman ewes, and reported a decrease in the serum concentrations of E2 to its minimum level at 15th day of the cycle (0.35 ± 0.15 ng/ mL). Additionally, another study verified that during the luteal phase, E2 concentrations were variable and there was a sharp decrease (p<0.05) from day 16 to 17 (Bartlewski et al, 1999).…”
Section: Resultssupporting
confidence: 88%
“…The progesterone levels during the period that starts six days before the second estrus ranged between 2.60-12.20 ng/ml and during the estrous cycle between 0.20-39.50 ng/ml. Values in this study were higher than the progesterone levels determined before as 0.10-2.00 ng/ml by Karagül et al, (1999) and similar with the progesterone levels determined before as 0.02-6.17 ng/ml by Arsoy and Sağmanlıgil (2018) for the WK sheep and various studies (Ali et al, 2006;Ali and Hayder, 2008;Coelho et al, 2006;Cunningham et al, 1975;Haliloğlu and Serpek, 2000;Seekallu et al, 2010) that were conducted on non-prolific breeds. They found similar mean progesterone levels reported in various studies (Mitchell et al, 1999;Özarslan, 2014;Sulu et al, 1988) on prolific breeds.…”
Section: Progesterone Levelssupporting
confidence: 87%
“…During the test days, the estrogen levels varied between 38.66-97.57 pg/ml. These values were found out to be close to the mean values (20.00-60.00 pg ml) that were determined by Karagül et al, (1999) and higher than the estrogen levels determined before as 3.50-8.42 pg/ml by Arsoy and Sağmanlıgil (2018) for WK sheep, higher than the estrogen levels reported in various studies (Bartlewski et al, 1999;Haliloğlu and Serpek, 2000;Seekallu et al, 2010) and lower than the mean estrogen levels reported for Bafra sheep (Özarslan, 2014). Johnson et al, (1996) reported that the ewes with high levels of estrogen before mating failed to conceive compared to the ewes with low concentrations of estrogen.…”
Section: Estrogen Levelssupporting
confidence: 87%
“…Los máximos en CP 4 , encontrados para el día 12, de 2.75±0.57 ng/ml en promedio, son comparables con reportes de países como Turquía, que referencian valores de P 4 de 3.50±1.50 ng/ml hacia el día 15 en hembras Karaman (29). En la fase lútea media, que se asume se da entre los días 6 a 12, el cuerpo lúteo se conforma por células lúteas maduras, por lo que la secreción de P 4 suele presentar menores variaciones, manteniendo los niveles altos, en crecimiento constante.…”
Section: Resultsunclassified