Who’s that in the left exhibit? Who’s that in the “Keebler den†area? How well do you know our pandas by their appearance? Your sharp eye and panda recognitions skills will be tested in the coming weeks, because we have instituted a new panda rotation at the San Diego Zoo. Let me explain…
As you may be aware, spring is the typical time for mating activity between adult pandas. In China and in managed-care facilities across the Americas and Japan, adult pandas of both genders will undergo a series of physical, hormonal, and behavioral changes in preparation for breeding. Male pandas will experience an enlargement of their testes associated with improved seasonal sperm production. Females undergo several changes to their vulvar region, including swelling and color changes. Behaviorally, males are more prone to restless wandering and scent marking, and females even more so. Females will descend into estrus by wandering for hours, forgoing food and traversing through the water along their restless travels. During this time, they gradually increase their rate of scent marking to a phenomenally high level. In this way they lay down a wide swath of scent which males will begin to pick up during their wanderings. This process takes approximately one to three weeks, depending on the female.
A few days before their optimal mating date, females reduce their scent marking and significantly increase their bleating and chirping. Presumably by this point the males in the area have cued in on her scent and have become aware of how close she might be to her estrus peak. They are close enough to hear her, and she draws them in with her calls. Finally they meet face to face, and if the two are amenable, they mate.
All of this is background for what we have started this week in San Diego: a new panda rotation. Each breeding year in the time before Bai Yun’s estrus, we allow the male and female to swap pens. We are allowing each adult bear to lay down their scent in an area that will soon be visited by another. In this way, Gao Gao has a chance to “read†what messages our female may have to send, and Bai Yun is afforded the opportunity to communicate her estrus status with the male. This is yet again an attempt to mirror the wild situation as much as possible. Since Bai Yun is not yet showing strong signs of estrus, the swap is currently occurring only a few times per week. As her estrus progresses, we will swap more frequently and ultimately, daily.
In addition to the rotation, we will begin opening the “howdy door†between them a few days per week. This door, a physical barrier between the bears that allows for visual and olfactory exchange, allows the pandas the chance to reacquaint themselves if they choose, or ignore each other unmolested if they prefer. In the wild, females who are not ready to mate will often run away from a male. In many captive facilities, females cannot run away and will therefore often fight with the male, and this can result in injury to either party. The howdy door is in the exhibit space, so visitors to the San Diego Zoo can watch the interesting encounters between the bears.
Those eagle-eyed among you may notice when the frequency of the rotation increases or when the howdy door is open more often. Those will be clues to you that the game is on, and Bai Yun’s estrus is off and rolling. In the past, she has peaked anywhere from mid-March to early April, so get your scorecards ready. And put me down for the first week of next month.
Suzanne Hall is the senior research laboratory technician for the Giant Panda Conservation Unit of Applied Animal Ecology/CRES.
Posted in Default, Giant Pandas, CRES (Conservation and Research for Endangered Species), General | Link to this post
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estem… me perdí en algún momento de la historia y debo admitir mi ignorancia.
¿Se liberaron de los ingleses o de los españoles?
Pues pásalo en grande dolores! Un besazo.
felicidades
Mmmmm, para mi el 25 de mayo es un mito, una excusa, convengamos que desde 1810 hasta 1853 y despues hasta 1862 y despues hasta 1880 de una u otra forma debimos seguir peleando, en algunas etapas los unitarios y los federales me hubiesen tenido tan repodrido como los peronistas y los radicales, los transversales y los hijos de puta. Seamos sinceros, este pais empezo en serio por 1880 (sin perjuicio de los logros de mitre, sarmiento y avellaneda) Aunque Roca fue un hijo de puta que extermino a los indios, uhhhhh, perdon el divague, estaba pensando en voz alta.
Feliz Dia argentina, ojala se te cumplan todos los deseos.
Lo mismo me pregunto yo en mi blog?
Supongo que tenemos libertad para ir a Plaza de Mayo sin temor a la represión, a los gases, etc!
Eso es libertad señores! Eso, no como en los United States!
Nadie me respondió… :(… no se independizaron de España y no de Inglaterra??
Que desmadre
Adhiero, nos liberamos de España.
De Inglaterra y USA todavía no…
Oh juremos con gloria morir! (no es en joda)
Besos niña
Entonces está mal la parte del post donde dice “Conseguimos la libertad de los ingleses”…
Ya decía yo…
Me hubiera gustado ir a festejar pero……..