By David E. Noakes, Timothy J. Parkinson, Gary C. W. England
This new 8th version of the vintage textual content covers all elements of copy and obstetrics in all universal family species, in addition to a number of much less universal species. this can be the single ebook to hide the entire diversity of household animals and now additionally contains much less universal species resembling llamas and alpacas. a number of extra universal, usually encountered small animal species resembling guinea pigs and rabbits are mentioned for the 1st time during this variation.
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Extra info for Arthur's Veterinary Reproduction and Obstetrics
In those cases in which this section did not pass through the greatest dimension of the significant corpus luteum or the largest follicle, the sketch has been made as though it did so but without materially altering the size of the ovary. 23 1 1 NORMAL OESTROUS CYCLES (a) (c) Fig. 18 Ovaries of a first-calf heifer in oestrus. 1, ripe follicle; 2, regressing corpus luteum, bright yellow; 3, corpus albicans. 16. 24 (b) Fig. 17 Ovary of cow in mid-dioestrus. (a) A mature corpus luteum (cl) with prominent ovulation papilla and mid-cycle follicle (f).
In ewes, the provision of housing with controlled lighting enables the breeding season to change from the autumn and winter, to spring and summer. Furthermore, by subjecting the ewes to a lighting regimen which does not have any change in duration it is possible to ensure breeding throughout the year, as is the case in equatorial climates. If mares are stabled at the end of December in the northern hemisphere, and are subjected to artificial light, preferably of increasing duration, then it is possible to advance the onset of normal cyclical activity so that there is oestrus and ovulation.
Pseudopregnancy was originally believed to be due to an intensification and prolongation of metoestrus; however, a number of workers have demonstrated that there is no difference in the progesterone concentrations in the peripheral blood of bitches with or without signs of pseudopregnancy. It is likely that the prolactin may well be responsible for initiating the changes. 37, the decline in progesterone appearing to coincide with the rise in prolactin. If bitches undergo ovarohysterectomy when they are pseudopregnant the condition can be intensified and prolonged.
Arthur's Veterinary Reproduction and Obstetrics by David E. Noakes, Timothy J. Parkinson, Gary C. W. England