Download e-book for iPad: 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

ISBN-10: 0702025569

ISBN-13: 9780702025563

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 one publication to hide the total diversity of family animals and now additionally contains much less universal species resembling llamas and alpacas. numerous extra universal, usually encountered small animal species corresponding to guinea pigs and rabbits are mentioned for the 1st time during this variation.

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Sample text

044 mg/kg body weight mixed in the feed for 10 days and then stopped. A good response will be obtained when given in the late transitional phase from anoestrus to 42 ● ● cyclical activity when follicles are present. The results are better if increased lighting is used. To suppress oestrus – for example, for shows or other functions. 044 mg/kg. To suppress oestrus in mares with prolonged oestrus or other aberrant sexual behaviour. To control the time of oestrus so that effective use can be made of a stallion or artificial insemination.

200 100 0 THE EWE 20 10 200 100 6 Oestrus 0 Oestrus Total oestrogens (pg/ml) 0 Progesterone (ng/ml) 1 3 0 0 Ovulation 21 Ovulation Days of oestrous cycle Fig. 28 Trends in hormone concentrations in the peripheral circulation of the cow during the oestrous cycle, with three follicular waves. The pre-oestrus rise in oestrogens stimulates the surge of LH from the anterior pituitary which is necessary for follicular maturation, ovulation and CL formation. A secondary less discrete peak has been demonstrated 24 hours after the ovulatory surge of gonadotrophin (Dobson, 1978).

Marked hypertrophy of the granulosa cells lining the follicles. Fig. 8 kg just after ovulation. The follicles of the right ovary are collapsed. The left ovary shows remnants of corpora lutea from a previous heat. Fig. 8 kg late in heat. Corpora lutea are forming; pleats are loose and flesh-coloured. Central cavities. The main feature which distinguishes them from other species previously described is the prolonged luteal phase, illustrated by the persistence of high progesterone levels in the peripheral blood.

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


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