By David E. Noakes, Timothy J. Parkinson, Gary C. W. England
This new 8th version of the vintage textual content covers all points of copy and obstetrics in all universal family species, in addition to a number of much less universal species. this is often the single ebook to hide the whole diversity of family animals and now additionally comprises much less universal species corresponding to llamas and alpacas. numerous extra universal, usually encountered small animal species equivalent to guinea pigs and rabbits are mentioned for the 1st time during this version.
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Additional resources for Arthur's Veterinary Reproduction and Obstetrics
Fecundity is best from the fourth to seventh gestations. Although the domestic sow is generally considered to be polyoestrous, the wild pig is a seasonal breeder, the main period being late autumn with a second peak of activity in April (Claus and Weiler, 1985). There is some evidence of the influence of photoperiod on reproduction in the domestic sow; for example, anoestrus is more prevalent in summer, and to a lesser extent February and March, whilst the ovulation rate is lower in summer. 7 days.
The hormone should be fed for 15 days and then stopped, so that the mare should come into oestrus 2–3 days later. Uses in the cow. Progestogens can be used to suppress oestrus as described in the mare but there are few practical indications for this purpose. However, there is ample indication for their use to synchronise groups of cows and heifers for artificial insemination and to overcome the problems of oestrus detection. Progesterone was first used by daily injection to synchronise oestrous cycles in groups of cows in 1948 (Christian and Casida, 1948).
1, ripe follicle; 2, regressing corpus luteum, brick-brown. 16. ENDOGENOUS AND EXOGENOUS CONTROL OF OVARIAN CYCLICITY Fig. 20 Ovaries of a nulliparous heifer just after ovulation. 1, collapsed follicle, surface wrinkled and blood-stained petechiae in wall; 2, regressing corpus luteum, bright yellow. 16. Fig. 24 Ovaries of a 6-year-old cow in early dioestrus. 1, active corpus luteum, orange-yellow, atypical protrusion; 2, regressing corpus luteum, small, shrunken, scarlet; 3, corpus albicans; 4, follicle.