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Female Reproduction - Donkey (view source)

Revision as of 21:48, 22 February 2010

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[[Female Reproductive Anatomy - Donkey|Female reproductive anatomy peculiarities]]
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'''[[Female Reproductive Anatomy - Donkey|Female reproductive anatomy peculiarities]]
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==Seasonality==
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<u>Ovarian activity in the jenny starts between 8 and 24 months of age</u>. This great variability can be explained by factors such as breed, nutrition, health, temperature and photoperiod. Seasonality of ovarian activity is variable and is likely to be influenced by photoperiod as well as nutrition and temperature. Scientific studies regarding seasonality present some discrepancy.
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Jennies may cycle all year around in the southern USA. In Wisconsin (latitude 43°N), the seasonality of the jenny seems to be less pronounced than that of mares. At this latitude, 64% of females were found to be cycling in December. Seasonal anoestrus lasts between 39 to 72 days (Ginther ''et al'', 1987).
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A marked seasonality in which 54% of the females present an anoestrus has been reported in Brazil (latitude 19°51' 06"S). Anoestrus season lasts 166.3 ± 63.2 days (Henry ''et al'' ,1987). Seasonality has also been described in Mexico (Orozco Hernandez ''et al'', 1992). In Morocco, our field observations show that the peak birthing season is March through May with some sporadic births occurring in February and from June until September. Studies in Ethiopia show that the rainy season (''i.e.'' increased
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food availability) is associated with higher sexual activity, follicular growth and incidence of ovulation in free-ranging tropical jennies (Lemma ''et al'', 2006a). Ovarian activity in these jennies is highly correlated with body condition (Lemma ''et al'', 2006b).
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'''[[Female Seasonality - Donkey|Seasonality]]
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The ultrasonographic characteristics of the uterus at different phases of the oestrus cycle are similar to those described for the mare (Lemma ''et al'', 2006).
 
The ultrasonographic characteristics of the uterus at different phases of the oestrus cycle are similar to those described for the mare (Lemma ''et al'', 2006).
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|linktext =Female Reproduction - Donkey
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[[Category:Donkey]]
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|linkpage = Sponsors
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|linktext = This page was sponsored and content provided by ''THE DONKEY SANCTUARY''
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==Pregnancy==
 
==Pregnancy==
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Foetal well-being and the foeto-placental unit can be evaluated in the same manner as for the horse. In late pregnancy, the foetus is generally very deep and cranially situated in the abdomen.
 
Foetal well-being and the foeto-placental unit can be evaluated in the same manner as for the horse. In late pregnancy, the foetus is generally very deep and cranially situated in the abdomen.
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{{toplink
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|linkpage =Female Reproduction - Donkey
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|linktext =Female Reproduction - Donkey
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|pagetype = Donkey
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[[Category:Donkey]]
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{{toplink
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|titleborder=E0EEEE
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|linkpage = Sponsors
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|linktext = This page was sponsored and content provided by ''THE DONKEY SANCTUARY''
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}}
 
==Parturition and ''post-partum''==
 
==Parturition and ''post-partum''==
 
[[Image:Late term jenny donkey.jpg|right|thumb|300px|<small><center>Late term pregnant female showing mammary development and ventral oedema. Although this development takes place primarily in the last 48 hours of pregnancy, it may be present in some females up to two weeks before parturition. (Image courtesy of  [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]
 
[[Image:Late term jenny donkey.jpg|right|thumb|300px|<small><center>Late term pregnant female showing mammary development and ventral oedema. Although this development takes place primarily in the last 48 hours of pregnancy, it may be present in some females up to two weeks before parturition. (Image courtesy of  [http://drupal.thedonkeysanctuary.org.uk The Donkey Sanctuary])</center></small>]]
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