| Autor: |
Mourad, Taherti1 tahmourad.2023@gmail.com, Azdinia, Zidane1 |
| Předmět: |
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| Zdroj: |
Fresenius Environmental Bulletin. Sep2023, Vol. 32 Issue 9, p2973-2980. 8p. |
| Abstrakt: |
This study aims to assess the reproductive potential and the particularities of sexual activity of the most important sheep breed in Algeria, called "Ouled Djellal". Data related to progesterone levels and estrous activity were monitored and followed up. The progesterone levels varied significantly (P<0.05) between ewes, and showed significant seasonal variations (P<0.05). The high levels of progesterone were observed from March to July (2.7±0.4 ng/ml), but low concentrations were recorded from October to February (1.4±0.4 ng/ml). Estrous activity followed similar variations to progesterone levels. Also, the highest total number of estrus was observed during the months of April to July. From September to February, the average duration of estrus recorded was 20±2.5 hours with more discreet heat signs, compared to 43±3 hours from March to August with more pronounced heat manifestations. The average length of estrous cycle in Ouled Djellal ewes was 18±0.6 days, with 70 % of the cycles between 16 and 21 days. From March to August the cycle length was 20±0.4 days. These results revealed that Ouled Djellal ewe shows different behavior than most breeds in Europe and North America: a sexual activity all year round with a decrease in autumn and an increase in spring/summer. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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