منابع مشابه
Reproductive parameters of common carp (Cyprinus carpio L) spawners during natural season and out-of-season spawning.
Common carp spawning characteristics were compared between season and out-of-season periods. There were no differences in the percentage of ovulation, spermatozoa motility and embryo survival to the eyed-egg-stage between the spawning periods. Fish spawned during the season produced oocytes of higher total weight than those spawned out-of-season. On the day exogenous feeding began, larvae obtai...
متن کاملInside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning.
Background and Aims. A recently described Brazilian species, Lacandonia brasiliana, shares with its longer established putative sister species from Mexico, L. schismatica, inverted floral patterning (carpels surrounding stamens) that is almost unique among angiosperms. We present a detailed ontogenetic study of L. brasiliana for comparison with other members of the tribe Triurideae (Triuridacea...
متن کاملefficacy of gnrh or cidr on out of season reproductive performance of ewe
abstract: an investigation was under taken to evaluate the out of season reproduction performance of ewe. a flock consisting 119 ewes was synchronized via implementation cidr over a period of 12 days, following by injection of pmsg (400 iu). the ewes inseminated and divided to three experimental groups. group1: injection of gnrh (5ml) at day 12 post insemination, group 2: received cidr for 5 to...
متن کاملOut-of-season breeding of milk goats--the effect of light treatment, melatonin and breed.
The purpose of this study was to evaluate the effectivity of melatonin in addition to light treatment (exposure to 2 hours of light during the night = a long-day photoperiod) to modify the breeding season of Saanen and cross-bred milk goats and to compare the difference between the breeds. Twenty-two Saanen and 22 cross-bred does were randomly divided into 3 treatment groups. Group 1 (controls)...
متن کاملCarrion flowers
In this Quick Guide, Johnson introduces the reader to carrion flowers, which evolved to mimic rotting flesh. This adaptation attracts insects that facilitate pollination.
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ژورنال
عنوان ژورنال: Nature
سال: 1884
ISSN: 0028-0836,1476-4687
DOI: 10.1038/031013a0