Ovarian follicles during infancy in Romanov and Ile-de-France ewe lambs
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چکیده
منابع مشابه
Resistance of Santa Inês and Ile de France suckling lambs to gastrointestinal nematode infections.
A trial was carried out to determine the resistance to natural infection by gastrointestinal nematodes in 12 Santa Inês and nine Ile de France lambs before weaning. Faecal samples were obtained for faecal nematode egg counts (FEC). Blood samples were collected to determine packed cell volume (PCV), total plasma protein levels and peripheral eosinophil counts. Most Ile de France lambs (77.8%) we...
متن کاملA comparison of the changes in LH, FSH and testosterone in spring-born ram lambs of two different breeds.
LH, FSH and testosterone variations were compared during the prepubertal period in Romanov and Ile-de-France ram lambs born in the spring. Mean plasma LH levels increased significantly between the 1st and 8th week of age in the Romanov and between the 1st and 12th week of age in the Ile-de-France. At 1 month of age, the number of LH and testosterone pulses per hour was higher in Romanov than in...
متن کاملThe measurement of daylength in the Ile-de-France ram.
Two groups of 12 adult Ile-de-France rams were exposed to artificial 6-month light cycles in which daily illumination was provided in one or two photofractions. In Group I, daylength increased linearly from 8 to 16 h in 3 months and decreased similarly from 16 to 8 h. The daily increment or decrement (5.33 min/day) was constant. In Group II, 8 h of light were given in two parts: the main one, 7...
متن کاملFraction of proliferating cells in granulosa during terminal follicular development in high and low prolific sheep breeds.
During terminal development of antral follicles, granulosa cells progressively lose their proliferative activity. Romanov (ovulation rate = 3) and Ile-de-France (ovulation rate = 1) breeds of sheep were compared for fractions of proliferating granulosa cells, determined by in vitro continuous [3H] thymidine labelling. In both breeds, the fraction of proliferating cells decreased with increasing...
متن کاملVariations in patterns of follicle development in prolific breeds of sheep.
Prolific breeds of sheep (Romanov, Finn and Booroola Romanov crosses heterozygous for the Booroola gene (F+) were compared with breeds of lower prolificacy (Ile-de-France, Finn X Scottish Blackface, Merino X Blackface and Booroola X Romanov not carrying a copy of Booroola gene (++] by in-vivo monitoring of follicular kinetics by ink labelling during the late luteal phase and follicular phase of...
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ژورنال
عنوان ژورنال: Reproduction
سال: 1987
ISSN: 1470-1626,1741-7899
DOI: 10.1530/jrf.0.0810241