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GLOSSARY 



Aestivation. A state of torpor in which some animals spend the 

 hot dry months of summer. 



Androgen. A hormone (e.g. testosterone) secreted primarily 

 by the testis, or a substance with similar physiological 

 properties prepared artificially. 



Anoestriis. The period of sexual inactivity between breeding 

 seasons, particularly in female mammals. 



Antrutn. The fluid-filled cavity which forms inside the ovarian 

 follicle of a marsupial or eutherian mammal. 



A.P.L.H. The anterior-pituitary-like-hormone secreted by the 

 placenta and usually obtained from human pregnancy 

 urine. 



Autumn. A term here used in a restricted sense to indicate the 

 period 21 September to 20 December in the northern 

 hemisphere, or the period 21 March to 20 June in the 

 southern hemisphere. 



Breeding season. The period of the year when mating behaviour 

 is evident, and when copulation results in fertilization. 



Corpus luteum. The solid body which forms from the torn 



remnants of the ovarian follicle after the escape of the egg 



at ovulation. 

 CorpiUs luteum atreticum. The solid body, similar to a normal 



corpus luteum, which forms from the ovarian follicle when 



an egg is resorbed. 



F.S.H. The follicle-stimulating-hoi*mone secreted by the 



anterior lobe of the pituitary gland. 

 Germinal epithelium. The epithelium which covers the surface 



of an ovary and from which the oogonia are formed. 



Gonadotropin. A general term covering the hormones F.S.H. , 

 I.C.S.H., and A.P.L.H. which stimulate the activity of 

 the gonads. 



Graafian follicle. An ovarian follicle possessing an antrum. 



Heat. The period of sexual excitement that develops in rnost 

 female mammals when the eggs are about to be shed from 

 the ovaries. Also known as oestrus. 



Hormone. A substance secreted by an organ or tissue for the 

 purpose of exerting a specific effect of functional value on 

 some other tissue. 



