Editing Addax (section)

===Reproduction===
Females are [[sexually mature]] at 2 to 3 years of age and males at about 2 years. Breeding occurs throughout the year, but it peaks during winter and early spring. In the northern Sahara, breeding peaks at the end of winter and the beginning of spring; in the southern Sahara, breeding peaks from September to October and from January to mid-April. Each estrus bout lasts for one or two days.<ref name=Krausman2007/>

In a study, the [[blood serum]] of female addaxes was analyzed through [[immunoassay]] to know about their [[luteal phase]]. [[Estrous cycle]] duration was of about 33 days. During pregnancy, [[Obstetric ultrasonography|ultrasonography]] showed the uterine horns as coiled. The maximum diameters of the [[ovarian follicle]] and the [[corpus luteum]] were {{cvt|15|mm}} and {{cvt|27|mm}}. Each female underwent an [[Anovulatory cycle|anovulatory period]] lasting 39 to 131 days, during which there was no [[ovulation]]. Anovulation was rare in winter, which suggested the effect of seasons on the estrous cycle.<ref name=Asa>{{cite journal |last=Asa |first=C.S. |author2=Houston, E.W. |author3=Fischer, M.T. |author4=Bauman, J.E.|author5=Bauman, K.L. |author6=Hagberg, P.K. |author7= Read, B.W. |title=Ovulatory cycles and anovulatory periods in the addax (''Addax nasomaculatus'') |journal=Journal of Reproduction and Fertility |year=1996 |volume=107 |issue=1 |pages=119–124 |doi=10.1530/jrf.0.1070119 |pmid=8699424 |doi-access=free}}</ref>

[[Pregnancy (mammals)|Gestation period]] lasts 257–270 days (about nine months). Females may lie or stand during the delivery, during which one calf is born. A postpartum estrus occurs after two or three days.<ref name=Densmore1986>{{cite journal |author1=Densmore, M.A. |author2=Kraemer, D.C. |year=1986 |title=Analysis of reproductive data on the addax (''Addax nasomaculatus'') in captivity |journal=International Zoo Yearbook |volume=24 |issue=1 |pages=303–306 | doi=10.1111/j.1748-1090.1985.tb02559.x}}</ref> The calf weighs {{cvt|5|kg}} at birth and is weaned at 23–29 weeks old.<ref name=Manski1991>{{cite journal |author=Manski, D.A. |year=1991 |title=Reproductive behavior of addax antelope |journal=Applied Animal Behaviour Science |volume=29 |issue=1 |pages=39–66 |doi=10.1016/0168-1591(91)90237-r}}</ref>