Effect of temperature on the silk production of the Eri silkworm, <i>Attacus ricini</i> Boisd. in Egypt

Gomaa, A. A.

doi:10.1111/j.1439-0418.1973.tb01808.x

Cited by 3 publications

(1 citation statement)

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“…The data in Table (2) showed means ,standard error (S.E) of age at sexual maturity , egg weight at sexual maturity (E.W) and hatchability in hens divided into three groups according to ASM Enab (1996), Gomaa (1997), and Abou-Elewa (2010). Table (2) shows that hatchability in adult early group was greater than others.…”

Section: Resultsmentioning

confidence: 99%

Sexual Maturity of Male Chickens According To Early Response of Semen Collection

E.M¹,

Enab²,

Abdou³

2017

IOSR JAVS

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91±0.0, 104.7±0.55 and 120.17±1.2d. of G1,G2 and G3 respectively ,There were highly significant differences among three groups. Female age at sexual maturity means were 144±162.05 d., 162.05±0.4 d. and 196±6.3 d. of G1,G2 and G3 respectively. ,with highly significant differences among three groups. There were no significance differences in semen quality traits at sexual maturity among all groups. Fertility in early group was greater than others. Hatchability in early group was greater than others. Males showed earlier sexual maturity than female, but differences between female groups were greater than male groups.

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Section: Resultsmentioning

confidence: 99%

Sexual Maturity of Male Chickens According To Early Response of Semen Collection

E.M¹,

Enab²,

Abdou³

2017

IOSR JAVS

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Effect of photoperiodism on the weight of Attacus ricini Boisd. (Lepidoptera, Saturiniidae)

Gomaa

Megalla

1974

Zeitschrift für Angewandte Entomologie

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The effect of photoperiodic regimes (complete darkness, 4, 8, 12, 16, 20 and 24 hours light per day) on the weight of different stages of the Eri silk worm, Attacus ricini Boisd. had been studied. The highest weight of L1 was recorded at 20 hours and of L5 at 8 hours light daily. In the L2, L3 and L4, the maximum weight was obtained when larvae were kept in complete darkness. The minimum weight of all instars were recorded at continuous illumination. There were no significant differences between the weights of silk glands picked out from full grown larvae reared under different photoperiods. The heaviest weight of male and female pupae was obtained when insects were exposed to complete darkness and 4 hours of light per day respectively, however, the minimum was recorded for the preceding sexes at 12 hours of light and continuous illumination respectively. The maximum weight of fresh cocoon was given in complete darkness, the maximum weight of dry cocoon and cocoon cortex were however obtained when insects were exposed to 4 hours of light per day. The minimum weight of cocoons were recorded when insects were kept at continuous illumination. Zusammenfassung Über die Wirkung der Photoperiode auf das Gewicht des Seidenspinners Attacus ricini Boisd. (Lepid., Saturiniidae). Es wurde die Wirkung von Dauer‐Dunkelheit sowie 4, 8, 12, 16, 20 und 24 Stunden Licht/Tag auf das Gewicht der Entwicklungsstadien von A. ricini untersucht. Bei den Erstraupen wurde das Höchstgewicht unter 20 Stunden, bei den L5 unter 8 Stunden Licht/Tag erzielt. L2, L3 und L4 zeigten ihr Höchstgewicht bei Aufzucht in völliger Dunkelheit. Das geringste Gewicht trat bei Dauerlicht auf. Beziehungen zwischen der Photoperiode und dem Gewicht der Spinndrüsen bei den erwachsenen Raupen bestanden nicht. Bei den ♂ Puppen wurde das höchste Gewicht unter Dauerdunkelheit, bei den ♀ unter 4 Stunden Licht/Tag erzielt. Das Minimalgewicht zeigten die ♂ Puppen unter 12 Stunden Licht, die ♀ unter Dauerbelichtung. Frische Kokons erreichten ihr Maximalgewicht unter Dauer‐Dunkelheit, trockene Kokons und Kokonmäntel dagegen unter 4 Stunden Licht. Das Minimalgewicht wurde auch bei den Kokons durch Dauer‐Beleuchtung hervorgerufen.

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Biological studies on the Eri silk worm, Attacus ricini Boisd. (Lepid., Saturniidae)

El-Shaarawy

Gomaa

El-Garhy

1975

Zeitschrift für Angewandte Entomologie

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The effect of feeding the larval stage of the Eri silk worm, Attacus ricini Boisd. on two castor‐bean varieties upon the weight of pupae and adults and the number of deposited eggs had been studied. Highly significant negative correlations were obtained for the effect of either maximum or minimum temperature on the duration of the larval stage. However, this correlation was not significant and positive for the mean percentage of relative humidity. The female pupae and adults were heavier than males. The weights of pupae and moths as well as the number of deposited eggs laid by moth fed in the larval stage on the red variety were significantly higher than those of larvae fed on the green variety. The high weights of pupae were obtained in the second, fourth and fifth generations, however, in moths this occurred only in the fifth generation. The high number of deposited eggs were recorded in the first, fourth and fifth generations. All of corresponding generations in the second year seemed to be similar to those of the first one. Zusammenfassung Biologische Untersuchungen über den Seidenspinner Attacus ricini Boisd. Es wurden die Wirkungen von verschiedener Nahrung (2 Varietäten der Ricinusbohne) auf das Gewicht der Puppen und Falter sowie der Zahl abgelegter Eier von A. ricini untersucht. Hochsignifikant war die Beeinflussung der Raupenentwicklungszeit durch die Temperatur, nicht jedoch durch die Luftfeuchtigkeit. Die ♀ Puppen und Falter waren schwerer als die ♂. Das Puppen‐ und Faltergewicht sowie die Zahl abgelegter Eier waren nach Fraß an der roten Varietät der Bohne signifikant höher als nach Fraß an der grünen Varietät. Höhere Puppengewichte und Eizahlen wurden in der 2., 4. und 5. Generation erzielt. Die entsprechenden Generationen im 2. Jahr verhielten sich ähnlich wie jene des 1. Jahres.

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Effect of temperature on the silk production of the Eri silkworm, Attacus ricini Boisd. in Egypt

Cited by 3 publications

References 1 publication

Sexual Maturity of Male Chickens According To Early Response of Semen Collection

Sexual Maturity of Male Chickens According To Early Response of Semen Collection

Effect of photoperiodism on the weight of Attacus ricini Boisd. (Lepidoptera, Saturiniidae)

Biological studies on the Eri silk worm, Attacus ricini Boisd. (Lepid., Saturniidae)

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