Effect of different photoperiods on testicular weight changes in the vole, Microtus agrestis
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چکیده
منابع مشابه
Sebaceous glands on the hindquarters of the vole, Microtus agrestis.
on the hindquarters at the age of about 3 months. In the following 1 to 2 months, hair is lost from these regions revealing raised patches of bright pink skin. Each patch is about 20 mm long and 15 mm wide, has a coarse texture, one or two characteristic folds (Pl. 1, Fig. 1) and a musty odour. Histologically, the skin contains very greatly enlarged holocrine sebaceous glands (Pl. 1, Fig. 2). T...
متن کاملHypothalamo-hypophysial control of ovulation in the vole (Microtus agrestis).
Electrical stimulation of the anterior hypothalamus of the vole, Microtus agrestis, usually results in ovulation, whereas stimulation of areas in the posterior hypothalamus do not. Ovulation can also be elicited by injections of sheep median-eminence extracts, and by preparations ofsheep luteinizing hormone. Observations on the number of corpora lutea formed, and ripe Graafian follicles remaini...
متن کاملPhotoperiodic control of testis activity in the vole, Microtus agrestis.
Under natural conditions the vole (Microtus agrestis) breeds in the spring and summer but not in the autumn and winter. This seasonal change was attributed by Baker & Ranson (1933) to the influence of hours of sunshine, and in the laboratory it has been shown that photoperiod affects the growth ofgonads and maintenance of their activity (Baker & Ranson, 1932; Clarke & Kennedy, 1967; Breed & Cla...
متن کاملFeulgen-DNA changes in the germ cells of the male vole (Microtus agrestis) during their development.
Consistent with changes in ploidy during germ cell maturation, the quantity of Feulgen DNA in round spermatids of voles is approximately a quarter of that in primary spermatocytes. The amount increases slightly in elongated spermatids, and then declines in spermatozoa from the testis, epididymis and vas deferens, below the level of round spermatids. Simultaneously nuclear area decreases so that...
متن کاملFurther observations on the influence of the social environment on ovulation in the vole, Microtus agrestis.
Although members of the species Microtus agrestis are induced ovulators (Austin, 1957; Breed, 1967), ovulation may be induced by stimuli other than those associated with mating, e.g. when females are separated from adult males by wire mesh (Milligan, 1974). Tactile contact between the sexes is not necessary for this ovulatory response as ovulation still occurred when two barriers of mesh, 2\m=....
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ژورنال
عنوان ژورنال: Reproduction
سال: 1981
ISSN: 1470-1626,1741-7899
DOI: 10.1530/jrf.0.0620025