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Twenty-five lactating dairy cows were treated with either saline (control), 500 mu g gonadotropin-releasing hormone (GnRH), GnRH + 10 mg oestradiol (E), oestradiol alone, or GnRH + E + 25 mg prostaglandin F2 alpha at approximately 11 days postpartum. Blood samples were taken at the time of injection...
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Scanning electron microscopy (SEM) was used to study the endometrium of nine 1-year-old thoroughbred mares after twice intrauterine infusions of gentamicin, on 2 consecutive days. Five mares were infused on 2 consecutive days with 40 ml gentamicin (50 mg/ml) mixed with 80 ml of normal saline. Four m...
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30 dairy cows were injected intramuscularly with 10 mu g GnRH daily on days 10-16 post partum and with 25 mg PGF2 alpha 14 days after the last injection of GnRH; 29 herdmate females (controls) were treated similarly, but were injected with saline in place of GnRH and PGF2 alpha . The internal genita...
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A review, including work on control of the oestrous cycle, induction of parturition, and embryo transfer..
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The possibility of long term storage, by cryopreservation in liquid nitrogen, of spermatozoa of ocean pout (Zoarces americanus) and the changes in motility, fertility and ultrastructure of the spermatozoa after freezing and thawing were examined. Four cryoprotectants, including DMSO, and 3 semen dil...
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Wichtel. J. J., Charinley. E., Richardson. G. F. Duynisveld. J. L. and Lofstedt. R, 2008. Effects of postpartum energy, intake on pregnancy rates in beef cattle subjected to GnRH- or CIDR-based timed artificial insemination protocols. Can. J. Anim. Sci. 88: 439-447. The objectives were to determine ...
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One hundred and twenty-six beef bulls on southwestern Louisiana coastal range were evaluated for breeding soundness. Samples were taken to determine the incidence of bovine leukemia virus (BLV) infection, and the prepuce was cultured for potential pathogens. A high incidence (47.6%) of questionable ...
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Two injections of PGF2 alpha spaced 12 days apart were used to synchronise oestrus in Hereford heifers. Animals were inseminated at 75 h (group 2), 80 h (group 3) or 85 h (group 4) after the 2nd injection of PGF2 alpha . Untreated, control animals (group 1) were inseminated as detected in oestrus ov...
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The Mules operation practically eliminated fly-strike and the need for jetting in a Merino flock, while in "Comeback" sheep flystrike was considerably reduced and jetting requirements were halved. For both types of sheep crutching time and wool soiling were reduced. Although the operation ...
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Twenty-seven different batch dates of frozen bull semen from 26 bulls were used in this study. The semen was in 0.5-ml straws, and 23 of the batch dates were in whole milk extender while 4 were in egg yolk-tris extender. Straws from each batch of semen were incubated for 2 hours in a water bath at 3...
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During May to August 1989, serum samples were obtained from 1933 cows in 61 herds of dairy cattle on Prince Edward Island, and tested for bovine leukaemia virus antibodies by agar-gel immunodiffusion. Of these, 106 (5.5%) cows from 30 herds were positive for leukosis. By county, positive results wer...
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The present study describes a new semen diluent (diluent C) which prolongs the sustained motility of ocean pout sperm, a distinguishing feature of the sperm of internally fertilizing teleosts. Sperm motilities were compared in the new diluent (C), based on the ionic composition of ocean pout seminal...