Endocrine Causes of Seasonal and Lactational Anestrus in Farm Animals

Front Matter....Pages I-VI
Preface....Pages 1-1
Front Matter....Pages 2-2
Seasonal Anestrus — Problems and Perspectives....Pages 3-5
Endocrine Basis of Seasonal Anoestrus in Sheep....Pages 6-18
Genetics and Physiology of Follicle Recruitment and Maturation during Seasonal Anoestrus....Pages 19-28
Breed Differences in the Breeding Season in Sheep....Pages 29-43
Light Control of Reproduction in the Ewe....Pages 44-54
Effects of Melatonin on the Time of Onset of the Breeding Season in Different Breeds of Sheep....Pages 55-65
Induction of Ovulation in Anoestrous Ewes Using Gonadotrophins....Pages 66-75
Induced Breeding in Anestrous Milking Ewes of Dairy Breeds: Comparison of Norgestomet, Medroxyprogesterone and Fluorogestone in Two Regimes of PMSG....Pages 76-82
Discussion....Pages 83-83
Front Matter....Pages 84-84
Stimulation of Ovarian Activity in the Pony Mare during Winter Anoestrus....Pages 85-97
Practical Control of Anoestrus in Thoroughbred Broodmares....Pages 98-107
Seasonal Anoestrus in Wild Sows....Pages 108-118
Photoperiod and Fertility in the Pig....Pages 119-130
Discussion....Pages 131-131
Front Matter....Pages 132-132
Hypothalamic-Pituitary-Ovarian Responses to Weaning — Retrospective Evidence for the Cause of Lactational Anoestrus?....Pages 133-144
Endocrine Interactions During Lactational Anestrus in Sows....Pages 145-153
Relevance of Prolactin to Lactational and Post-Weaning Anoestrus in the Pig....Pages 154-164
Effects of Bromocriptine Treatment During Lactational Anestrus in Pigs....Pages 165-178
Discussion....Pages 179-179
Front Matter....Pages 180-180
Post Partum Anoestrus: Problems and Perspectives....Pages 181-185
Comparative Aspects of the Postpartum Period in Domestic Animals....Pages 186-198
Reproductive Potential During the Post Partum Period in Cows....Pages 199-205
Endocrine Mechanisms Contributing to Postpartum Anoestrus in Dairy and Beef Cattle....Pages 206-220
Studies on the Endocrine and Environmental Factors Influencing Post Partum Acyclicity in Dairy Cows Based on Progesterone Profiles (Preliminary Results)....Pages 221-232
Discussion....Pages 233-233
General Conclusion....Pages 234-235
Back Matter....Pages 236-237