Generally, the larvae of " Gedoelstica " and " Oestrus " occur in the nasal passages and respiratory cavities of the blue wildebeest, and sometimes migrate to the brain.
42.
The Massese remains in oestrus throughout the year, and normally lambs three times every two years; this, coupled with a twinning rate of 135 %, allows production of two lambs per year.
43.
Studies suggest that the onset of breeding occurs by the timing of the female oestrus, as males were observed to be in proper conditions to reproduce for about a month prior to the occurrence of breeding.
44.
The males fight other males from a very young age to establish their individual positions in the male hierarchy and during the breeding season, dominant males will guard females for the right to breed with her when she comes into oestrus.
45.
A study of the animal in Karroid Mountainveld ( Eastern Cape Province, South Africa ) revealed the presence of all the larval stages of the nasal bot flies " Oestrus variolosus " and " Gedoelstia h�ssleri ".
46.
Contrary to constantly recurring claims of radical differences in behaviour and biology, a single annual breeding cycle, seasonal adapted oestrus, monogamy, parental care by the males, have all been observed among domestic dogs of most diverse backgrounds.
47.
Studies in Namibia and Zimbabwe show that when males hear this special " oestrus call " they drop everything and silently plod off in the direction of the sound . " To some calls, elephants will respond and call back.
48.
Breeding females may advertise oestrus ( being " on heat " or " in season ", i . e . that they are fertile, ovulating and receptive to breeding ) with pheromones ( scent ), courtship behaviour, and visual signals.
49.
Females become sexually mature at 21 to 22 months of age . each oestrus lasting one to three days . A female can give birth again after 17 to 20 months; however, on the loss of a whole litter mothers can mate again.
50.
This progress was made possible by understanding the phenomenon of oestrus which enabled the fertile time of the animal ovarian cycle and ovulation to be determined with precision ( oestrus causes the female to accept the male only at the most fertile time of the cycle ).
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