Position Of Egg Research Articles

The Relationship of Oviposition Time, Clutch Position, Barometric Pressure, and Egg Weight to the Incidence of Blood Spots in Eggs

THIS experiment was designed to determine if ovulation time (based on oviposition time) was different for eggs containing blood spots than for normal eggs. In addition, the experiment was set up to discover if there was an influence on the incidence of blood spots due to egg clutch position, barometric pressure, egg weight, and egg albumen height.Some studies of this nature have been reported in the literature; however, none of them reported the influence of ovulation time on blood spots. Quinn and Godfrey (1940) found no significant correlation between the percentage of blood spots and egg production, egg weight, or body weight. Jeffrey (1945) studied the relationship between the size and color of meat spots and the position of the abnormal eggs in the clutch. He found that the percentage of large red meat spots was highest in the eggs in clutch position 1 followed by a sharp decline …

Quantitative Changes in the Hen’s Oviduct Associated with Egg Formation

IN A previous report (Smith et al., 1957), the weight of the oviduct in the normal laying hen was compared with the secretory state of the magnum, as estimated by the position and condition of eggs found in the oviduct on autopsy. The oviduct was considered “pre-secretory” if it contained a hard-shelled uterine egg since these birds, if not sacrificed, soon would have deposited albumen on a new egg; it was considered “post-secretory” when a soft-shelled uterine or isthmian eggs were found. Assuming that albumen is accumulated in the magnum during the intersecretory period (as is indicated by histological findings; Richardson, 1935), one would expect the weight of the “pre-secretory” oviduct to exceed that of the “post-secretory” oviduct by approximately the weight of the deposited albumen (i.e., 20 gms.). Since this anticipated difference in oviduct weight was not found (Smith et al., 1957), another experiment, reported herein, was carried out …

Emergence of Larvæ from Sealed Cysts of the Potato Root Eelworm, Heterodera rostochiensis Wollenweber

INVESTIGATION of the distribution of hatching among the eggs contained in the cysts of the potato root eelworm showed that hatching is not random ; eggs near the cyst wall tend to hatch sooner than eggs nearer the centre of the egg mass1. It also appeared that the position of eggs in relation to either of the two natural openings, the neck and vulva, was without influence on the hatching distribution : further work has confirmed this finding, for it has now been shown that sealing either of the openings has no detectable effect on the distribution. Moreover, emergence from cysts with only one effective opening appears to take place as rapidly as from normal cysts.

The Distribution of Hatching within the Cyst of the Potato Root Eelworm, Heterodera rostochiensis

ABSTRACT A serial-sectioning technique is described for cysts of the potato root eelworm. The distribution of hatching among eggs contained in the cysts is investigated by this technique. It is shown that there are significant differences in the numbers of larvae emerging from different parts of the cyst, i.e. hatching is not random. There is a tendency for eggs near the cyst wall to hatch sooner than eggs nearer the centre of the egg mass. The position of eggs in relation to the natural openings of the cyst, at the neck and vulva, is apparently without influence on the distribution of hatching. Although the cyst wall is permeable to the hatching stimulant it is argued that the hatching pattern is more likely to be due to a gradient of oxygen tension within the cyst.

A Comparison of Certain Methods of Estimating Shell Strength

THE strength of egg shell is an important factor in egg quality particularly in its relation to handling and transportation of eggs. Furthermore, Munro (1940, 1942) has shown that shell strength may be indicative of the hatching power of eggs. Shell strength is an extremely variable characteristic being influenced by numerous environmental and physiological factors such as diet, rate of egg production, length of period of egg production, position of egg in the clutch, breeding and climatic conditions.Most tests for strength or thickness of shell involve physical or chemical measures which require the egg to be broken. However, the specific gravity method of Olsson (1934) provides a measure of percentage shell without injury to the intact egg whether it be used for hatching or goes into market channels. The specific gravity method has been used satisfactorily in shell quality experiments for a number of years at Ottawa. Since resistance .

The biological position of birds' eggs

The biological position of birds' eggs

Multiple Turning and Orienting Eggs During Incubation as They Affect Hatchability

TURNING eggs has long been known to be necessary in artificial incubation to secure satisfactory hatches. Until the development of Mammoth incubators, however, little attention was given to the manner of turnings eggs or to the number of times they were turned a day. Eycleshymer (1907) appears to be one of the first to report the effect of not turning eggs. He found that he obtained only a 15 percent hatch when the eggs were not turned as compared to 45 and 58 percent hatches when the eggs were turned two and five times per day, respectively. He further states “that position of egg is a factor of little importance.” Jackson (1912) found that eggs turned twice daily hatched slightly better than those moved only once a day and also that “eggs laid flat and turned twice daily gave better results than those kept in any other position.” Comparisons between .