The distribution of sialic acid residues as well as other glycosidic sugars has been investigated in the horse oviductal isthmus during anoestrus, oestrus and pregnancy by means of lectin and pre-lectin methods. Ciliated cells and non-ciliated (secretory) cells exhibited different lectin binding profiles that were found to change during the investigated stages. Ciliated cells did not show any r...

The gene coding for the major outer membrane protein Omp31 was sequenced in five Brucella species and their biovars. Although the omp31 genes appeared to be highly conserved in the genus Brucella, nine nucleotide substitutions were detected in the gene of Brucella ovis compared to that of Brucella melitensis. As shown by differential binding properties of monoclonal antibodies (MAbs) to the two...

Rats ovulate during the 1st or 2nd night following parturition (Hoffman & Schwartz, 1965). Subsequently, oestrus is not usually observed during lactation. After weaning, cycling is resumed and only then can oestrus be discerned (Long & Evans, 1922). The possibility of studying the relation between lactation and fertility is, therefore, conditional on effective mating of the females at the post-...

Immune sera were prepared in rabbits by the injection of living and acetone-killed cells of Brucella ovis and smooth and rough B. melitensis. The use of whole-cell antigens in agglutination and agglutinin-absorption tests revealed little relationship between B. ovis and smooth B. melitensis, although there was extensive cross-agglutination between B. ovis and rough B. melitensis. The use of wat...

Regular worm counts were done post-mortem on sheep that had grazed on Kikuyu pastures at the Elsenburg Research Station near Stellenbosch, a winter rainfall region. Major species were Trichostrongylus colubriformis, Trichostrongylus axei, while Ostertagia circumcincta was usually present in large numbers. Minor species were Haemonchus contortus, Nematodirus spathiger, Dictyocaulus filaria, Oeso...

American black bears (Ursus americanus) are seasonally polyoestrous and exhibit delayed implantation, which may allow equal and independent fertility of recurrent oestruses of a mating season. We postulated that the luteal inactivity during delayed implantation allows bears to have sequential ovulation during a polyoestrous mating season such that each oestrus of a polyoestrous female will have...

This study aimed to assess the prevalence of Babesia ovis infection in adult Rhipicephalus bursa and small ruminants in West Azerbaijan province, Iran. Blood samples were collected from 280 sheep and 122 goats of forty randomly selected flocks. Specific B. ovis fragment was detected in 67 animals (16.7%), of which 52 animals (18.6%) were sheep and 15 animals (12.2%) goats (P < 0.05). Of the 848...

the objective was to quantify and compare cow cervical morphology on oestrus vs. non-oestrus daysusing a new farm technology. the cervical tissues were videotaped using a cervixscope involving newcamera equipment in four holstein cows on multiple oestrus and non-oestrus days to score tissue morphology as altered by oestrus. the non-oestrous days were in diestrus phases. the videotaped records w...

Six priming doses of 40 mg progesterone at two day intervals followed by 1,000 I.U. P.M.S. were superior to two priming doses plus P.M.S. in inducing oestrus. At the first insemination after induction of oestrus, fertility was normal in animals which received two doses, but depressed in those which received six doses of progesterone. An injection of 40 mg of progesterone after the injection of ...

Prostaglandin F~(Y, (PGF2a) causes luteolysis in several species of animals including cattle and sheep. This has led to investigations with PGF2a as an agent for the control of oestrus and ovulation in domestic animals (Inskeep 1973) and to comparison of PGF2a and progestins as practical methods of synchronizing oestrus in cattle (Smith 1973). This paper reports preliminary studies of the use o...