The reaction of imported British Shire horses to African Horse Sickness: A case report.
Summary Twelve (12) heavy horses of the Shire breed imported into Nigeria in 1974 died within two months after importation. This was because of inclement weather and non-availability of AHS vaccine.
The developmental viability and sizes of sequentially oviposited eggs ofBoophilus decoloratus andBoophilus geigyi
The viability and sizes of eggs sequentially laid up to the 10th day of oviposition by engorgedBoophilus decoloratus andBoophilus geigyi were studied. The average length and breadth of eggs laid on the 1st and 2nd days of oviposition were statistically greater than at subsequent ovipositions. The eclosion periods of eggs laid from 7th to 10th day of oviposition were shorter than those of eggs laid earlier by bothBoophilus species. The percentage mortality of eggs of 9th and 10th day of oviposition was significantly higher than that of the earlier ovipositions. The numbers of larvae which engorged on rabbits after hatching from eggs of 7th–10th day ovipositions were significantly fewer than those which hatched from eggs of earlier ovipositions. It is concluded that eggs of early ovipositions ofB. decoloratus andB. geigyi are more viable and survive longer than those of later ovipositions. It is also suggested that the shorter eclosion period of the eggs of later ovipositions is due to the process of embryogenesis which is gradual in the eggs of early ovipositions and faster in those of later ovipositions.
Investigations into the transmission of bluetongue in sheep during the season 1931/1932
From the epizootological point of view, horsesickness and bluetongue are very closely related to one another, and what has been said about horsesiclmess-it being non-contagious by ordinary means of contact, the seasonal and also to a certain extent the geographical distribution, the dependence on the amount of rain, the occurrence in marshy vleis and absence on hill tops, the danger of g-razing at night, during the late afternoon or the early hours of the morning, the protection afforded by stables-applies practically as well to horsesickness as to bluetongue and does not need to be discussed at length.