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Provedor de dados:  Animal Sciences
País:  Brazil
Título:  Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions
Autores:  Arsoy, Dilek
Sağmanlıgil, Vedat
Data:  2018-10-01
Ano:  2018
Palavras-chave:  Animal production animal reproduction breeding season
Indigenous ewes
Postpartum estrous
Resumo:  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 (P4), 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 (39.570N, 32.530W), Turkey. Estrous cycle lengths and estrous lengths were 18.36 ± 1.03 days and 35.16 ± 5.95 hours, respectively. The breeding season durations were 283 ± 63.36 days and 229.64 ± 63.74 days according to hormonal and behavioral data respectively (p £ 0.01). The highest and lowest data of estrous occurrence frequency was observed in October and June-July, respectively. P4 levels ranged from 0.01 to 9.0 ng mL-1 throughout the year and from 0.01 to 0.16 ng mL-1 during anestrous. Mean plasma estradiol levels were 8.42 ± 2.51 pg mL-1 during the estrous cycle. Postpartum anestrous durations were 134.8 ± 18.5 and 120.78 ± 29.89 days (n = 9) according to behavioral observation and hormonal data, respectively. P4 concentration for the months 1 – 5 of the gestation period ranged from 4.54 to 15.08 ng mL-1. P4 concentrations in 4th and 5th months of gestation were higher than the other months (p £ 0.01). White Karaman reproductive activity is characterized by an extended breeding season and their relatively insensitivity to photoperiod stimulation allows for efficient out of season lamb production.  
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês

Editor:  Editora da Universidade Estadual de Maringá
Formato:  application/pdf
Fonte:  Acta Scientiarum. Animal Sciences; v. 40 (2018): Publicação Contínua; e39908

Acta Scientiarum. Animal Sciences; v. 40 (2018): Publicação Contínua; e39908


Direitos:  Direitos autorais 2018 Acta Scientiarum. Animal Sciences

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