Arthur's Veterinary Reproduction and Obstetrics by David E. Noakes, Timothy J. Parkinson, Gary C. W. England

By David E. Noakes, Timothy J. Parkinson, Gary C. W. England

This new 8th variation of the vintage textual content covers all features of replica and obstetrics in all universal family species, in addition to a number of much less universal species. this can be the one publication to hide the total variety of household animals and now additionally contains much less universal species comparable to llamas and alpacas. numerous extra universal, usually encountered small animal species reminiscent of guinea pigs and rabbits are mentioned for the 1st time during this variation.

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A substantial number of these follicles are destined for ovulation, although it is not possible to identify the pre-ovulatory population until day 21–22 of the oestrous cycle. The growth of selected pre-ovulatory follicles during the follicular phase is associated with rapid atresia of small follicles, and a block to their replacement in the proliferating pool, thus indicating some intra31 1 NORMAL OESTROUS CYCLES 32 wine-coloured CLs of the current cycle, also the smaller pale CLs of the previous cycle and the grey specks of the third-generation CLs.

1972). Whether this effect occurs in adequately fed individuals is difficult to determine (Aherne and Kirkwood, 1985). Other non-hormonal methods The presence of a male animal can exert its effect upon the cyclical activity of the female. This is well demonstrated in sheep, where the introduction of a vasectomised tup at the start of the breeding season will stimulate the onset of oestrous cycles in the majority of ewes and can also bring about some degree of synchronisation of cyclical patterns (see Chapter 24).

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). (b) Section of the same ovary showing the corpus luteum (cl) with a central lacuna which was filled with orange-yellow fluid, and the mid-cycle follicle (f). Note that the ‘wall’ of the corpus luteum comprises at least 5 mm thickness of luteal tissue.

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