The species which deposits its larvæ in the nasal cavities of sheep is oestrus ovis.
Note: The sheep gadfly (Oestrus ovis) deposits its young in the nostrils of sheep, and the larvæ develop in the frontal sinuses.
In most instances the orifice was not indicative of actual oestrus, as it persisted through the preceding and following stages of an oestrus cycle.
In oestrus the genitalia are enlarged and discolored and the vaginal orifice is prominent and gaping.
Multiple captures often involved a female in oestrusand one or more males, or a female and her young, but other instances involved various combinations of sex and age groups.
Pregnancy from post-partum oestruswould seem to be less frequent than pregnancies beginning a few days after birth of the previous litter, and within the period of lactation.
Post-partum females obviously in oestrus were prevented from being fully receptive by their hostility toward males whose presence might endanger the young.
The perforate condition recorded in Table 1 may represent any of several stages in oestrus or pregnancy, but is regarded as a crude index of rate of breeding, since voles in the anoestrus stage lack the vaginal orifice.
In the strictly similar instance of Reindeer-fly (Oestrus tarandi, Linn.
Joly of the Gad-fly (OEstrus equi) represented in Figs.
Portion of the stomach of the horse, and larvae of OEstrus (gasterophilus) equi.
A Herd of Horses attacked by Gad-flies (OEstrus equi).
A Herd of Cattle attacked by Bot-flies (OEstrus bovis).
If the reindeer should even have the small-pox every year, this supposed disease will prove on examination nothing else than the sting of the Gad-fly (Oestrus Tarandi).
It must, however, be borne in mind that the warbles are the larvæ of the oestrus bovis, which is said to be the most beautiful variety of gad-fly.
The author has been informed, by persons in whom he ought to have confidence, that the free use of the card, during the above-named months, is a specific protection against the attacks of the oestrus bovis.
Comparing the Oestruswith the Myops (synonymous perhaps with Tabanus, Latr.
Mr. Clark, however, is of opinion that the Oestrus does not pierce the skin of the animal, but only glues its eggs to it.
It seems more probable that the Oestrus of Greece was related to Bruce's Zimb, represented in his figure with a long proboscis, which makes its appearance in the neighbourhood of rivers, and belongs to the Tabanidae.
I cannot help suspecting this to be synonymous with the Oestrus Hominis next mentioned.
Oestrus pictus has figured a fine species of Gad-fly taken in the New Forest, which he conjectures may be bred from the Deer.
At the season when the Oestrus infests them, close attention should be paid, and their harness so constructed that they may easily be let loose.
For these reasons a definite period of oestrus may readily be interfered with, but the instinct is, I am convinced, still marked.
In the dog, however, the period of the oestrus cycle is about the as that of gestation--namely, six months.
When the ovum or ova, not being fertilised, die the period of development is (usually) shortened and pro-oestrus or menstruation occurs.
The OEstrus ovis occasions much distress to the sheep at the moment of depositing its eggs within the nostril.
Among animals the rule is simple and uniform; as soon as the female is impregnated at the period of oestrus she absolutely rejects all advance of the male until, after birth and lactation are over, another period of oestrus occurs.
Possibly the incident is not exaggerated, as a single Oestrus will turn the oxen of a whole herd, and render them furious.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "oestrus" in a variety of sentences. We hope that you will now be able to make sentences using this word.
