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- W2435582415 abstract "It is most probable that during natural copulation the semen of the fowl is ejaculated into a shallow position in the vagina of the hen, but during the commercial application of artificial insemination it is generally considered necessary to evert the distal vagina and deposit semen to a depth of at least 5 cm to produce optimal fertilisation of the succession of eggs laid daily by a female for a week post-insemination. Aspects of the artificial insemination technique in relation to the types of semen that are obtained from the male fowl artificially are re-appraised in relation to their effect on fertility. It was confirmed that a smaller number of spermatozoa (50 × 106) than is normally used in commercial practice (>80 × 106) produced good fertility, even when inseminated within 0.5 cm of the vaginal opening in the cloaca. The results were achieved whether or not glucose was present in the inseminate. When semen was deposited in the cloaca, a better fertilisation rate was obtained if ductus-deferens semen was diluted with transparent fluid, which is produced by tumescent tissue in the cloaca during semen collection. However, the same advantageous effect was shown by dilution with synthetic aqueous fluids with and without glucose. The likely role of transparent fluid during natural copulation is discussed. On the basis of the number of spermatozoa found to maintain good fertility by artificial insemination, only 10 μl semen would be required to be ejaculated into each hen during copulation. This may account for the well-known ability of the male fowl to copulate frequently in a day, because the small volume of semen would be replenished, naturally, very quickly in the ductus deferens." @default.
- W2435582415 created "2016-06-24" @default.
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- W2435582415 date "2016-06-01" @default.
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- W2435582415 title "Analysis of long term outcome and identification of the predictors of recurrence in patients with resectable pancreatic neuroendocrine tumors" @default.
- W2435582415 doi "https://doi.org/10.1016/j.pan.2016.05.236" @default.
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