Proceedings: Ovarian follicles and hormonal characteristics of ewe lambs selected for and against multiple births

The numbers of primordial follicles in ovaries of ewe lambs, from two groups of Peppin Merinos that had been selected for (T group) and against (0 group) mUltiple births, were estimated at birth, 7 days and 5 months of age. Peripheral plasma and anterior pituitary levels of LH and FSH were determined by radioimmunoassay in the lambs at 5 months of age. These lambs were either entire or unilaterally ovariectomized (hemispayed) at 7 days of age.

Download Full-text

Some effects of nutrition on the growth and sexual development of ewe lambs

The Journal of Agricultural Science ◽

10.1017/s002185960005005x ◽

1961 ◽

Vol 57 (1) ◽

pp. 87-95 ◽

Cited By ~ 34

Author(s):

D. M. Allen ◽

G. E. Lamming

Keyword(s):

Size Distribution ◽

Sexual Development ◽

Subcutaneous Injection ◽

Control Level ◽

Live Weight ◽

Ovarian Response ◽

Ovarian Follicles ◽

Ovulation Rate ◽

Nutritional Treatment ◽

Ewe Lambs

1. In the seasons of 1957 and 1958–59 a total of 130 ewe lambs were used to investigate the effects on growth and sexual development of high and moderate planes of nutrition during the rearing period.2. The nutritional treatments imposed had significant effects on rate of growth; puberty occurred at an earlier age in high-plane than in moderateplane lambs. Also, in 1958–59, four moderateplane lambs failed to exhibit oestrus during their first winter of life.3. Puberty occurred at a significantly lower live weight in moderate-plane than in high-plane lambs.4. In lambs slaughtered after first oestrus, ovulation rate was not significantly affected by nutritional level, nor was the number of ovarian follicles greater than 2 mm. in diameter. However, high-plane lambs tended to have more follicles less than 2 mm. in diameter than moderate-plane lambs.5. In 1958–59 the ovarian response to a subcutaneous injection of 800 i.u. of p.m.s. was investigated in half the lambs from each nutritional treatment. Injections of p.m.s. caused a marked increase in ovulation rate over the uninjected control level but there was no difference in response between nutritional treatments. Pregnant mare's serum did not alter the size distribution of ovarian follicles.

Download Full-text

Ovarian Follicles of New-born Merino Lambs from Genetic Lines which Differ in Fecundity

Australian Journal of Biological Sciences ◽

10.1071/bi9830351 ◽

1983 ◽

Vol 36 (4) ◽

pp. 351 ◽

Cited By ~ 10

Author(s):

Robin J Tassell ◽

JP Kennedy ◽

M Bindon ◽

LR Piper

Keyword(s):

Litter Size ◽

Ovarian Follicles ◽

Multiple Births ◽

Primordial Follicles ◽

New Born

Ovaries were obtained from 78 new-born lambs (12 singletons, 25 twins, 28 triplets, 10 quadruplets and 3 quintuplets) from flocks selected for (T902, T903 and Booroola) or against (0) multiple births. Sections of the ovaries were examined with a projection microscope and the numbers of all types of follicles were estimated. There were no differences between genetic lines in the number of primordial follicles, after adjustment for litter size and sire; however, there were significantly more of these follicles in single-born lambs than in lambs born in litters of two or more within genetic lines. The number of vesicular follicles was lower in Booroola than in 0 lambs.

Download Full-text

The expression of angiotensin and endothelin family members in mature ovarian follicles during periovulatory period after GnRH in the cow

Experimental and Clinical Endocrinology & Diabetes ◽

10.1055/s-2006-933024 ◽

2006 ◽

Vol 114 (S 1) ◽

Author(s):

B Berisha ◽

A Miyamoto ◽

H Welter ◽

D Schams ◽

HHD Meyer

Keyword(s):

Family Members ◽

Ovarian Follicles

Download Full-text

THE AUTORADIOGRAPHIC DISTRIBUTION PATTERN AFTER ADMINISTRATION OF DIETHYLSTILBOESTROL COMPARED WITH THAT OF NATURAL OESTROGENS

Acta Endocrinologica ◽

10.1530/acta.0.0430561 ◽

1963 ◽

Vol 43 (4) ◽

pp. 561-570 ◽

Cited By ~ 18

Author(s):

Gösta Bengtsson ◽

Sven Ullberg

Keyword(s):

Distribution Pattern ◽

Adrenal Cortex ◽

Natural Compounds ◽

Ovarian Follicles ◽

Interstitial Tissue ◽

Specific Accumulation ◽

Natural And Synthetic

ABSTRACT The distribution in mice of 14C- and 3H-diethylstilboestrol has been investigated autoradiographically. The results have been compared with those which have been previously reported for natural oestrogens. Many similarities have been demonstrated between the synthetic and natural compounds. Thus a specific accumulation has been observed in the endometrium, the granulosa layer of large ovarian follicles, the adrenal cortex. the interstitial tissue of the testes, and the hypophysis. Natural and synthetic oestrogens differ widely concerning the penetration into and the distribution within the foetus.

Download Full-text