By D.J.A. Cole and G. R. Foxcroft (Auth.)
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Additional resources for Control of Pig Reproduction
Indeed, Lundstrom et al. (1980) have indicated that skatole and indole in boar carcasses can enhance boar taint above that produced by 5a-androstenone alone; this adds a new dimension to the subject of boar taint, which is beyond the scope of this review. Conclusions The essential theme of this review has been to emphasize that the boar testis produces a variety of steroids. Of these, three groups of biologically significant steroids namely androgens, oestrogens and 16-androstenes, have been discussed.
However much higher levels of DHA sulphate, 16-175 ng/ml, (Booth, 1980a; Tan and Raeside, 1980; Setchell et ai, personal communication) and 5-androstenediol sulphate (Booth, 1980a) are present. D. , 1976; Lapwood and Florcruz, 1978), although during puberty LH showed a highly pulsatile mode of secretion. Reports of a diurnal variation in androgen secretion are contradictory. The data of Claus and Gimenez (1977) and Claus and Hoffmann (1980), indicate that the highest levels of testosterone in spermatic vein and peripheral plasma occur during the afternoon and after midnight.
This aspect is reinforced in studies on the castrated boar aimed at elucidating the role of androgens and oestrogens on accessory organ function and sexual behaviour. Joshi and Raeside (1973) castrated boars around 12 months of age which had been trained to mount a dummy, and then gave them a series of intramuscular injections for 6-week periods of testosterone alone, or alternating with diethylstilboestrol, oestrone or oestradiol-17ß in combination with testosterone. Whereas testosterone alone had only a slight effect on restoring the volume of ejaculates and libido, oestrogen in combination with testosterone significantly enhanced both the secretory activity of the accessory organs and libido; these findings indicated a synergistic role for oestrogens with androgens.
Control of Pig Reproduction by D.J.A. Cole and G. R. Foxcroft (Auth.)