Effect of Photoperiods on Testicular Growth and Onset of Egg-laying in the Guinea Fowl.
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The weight of testis of the guinea fowl under 12L:12D and 6L: 18D was found to be greater at 30 weeks of age than that under 18L: 6D, although smaller at 10 and 20 weeks of age. The age at first egg-laying under 12L: 12D was 283 days which was the longest among the groups. It was about 157 days and about 129 days and 129 days longer under 12L: 12D and 6L: 18D than that under 18L: 6D or 14L: 10D, respectively. The weight of the first egg and of its yolk was greater in hens under 12L: 12D or 6L: 18D than those under 18L: 6D or 14L: 10D. The greater testicular growth and the remarkable delay in the onset of egg-laying in hens under 12L: 12D and 6L: 18D may be characteristic of the guinea fowl.Keywords:
Guinea fowl
Fowl
Yolk
Guinea fowl
Fowl
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Fowl
Guinea fowl
Complement fixation test
Complement factor B
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Guinea fowl
Fowl
New guinea
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Guinea fowl
Fowl
Erythrocyte fragility
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COMPARATIVE CYTOMORPHOLOGICAL, CYTOCHEMICAL AND CYTOENZYMIC STUDY ON BLOOD CELLS OF DOMESTIC FOWL, GUINEA FOWL AND PIGEON
Guinea fowl
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During fowl egg's incubation period,the variation of calcium content of each component shows up its certain regularity.Before 12 day ages,the calcium content of eggshell,albumen or yolk varies little.But after that,the calcium content of eggshell varies more than that of albumen and yolk,What's more,the calcium of eggshell turns into the main resource of calcium during the growth of fowl egg.From the experiment,we also discover that the calcium content of yolk before incubation is not quite a contrast to that of the left yolk when fowl comes to its birth.But about 18 day ages,the calcium content of yolk rises to a great extent.The result verifies that yolk can focus calcium.And it is great bencfit to what fowl's embryo need during its growth.
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Fowl
Incubation period
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A preliminary study was conducted to investigate the contents in yolk and albumen of trace minerals Al, Br, Ca, Cl, K, Mg, Na in eggs from Domestic chicken, Guinea Fowls and Ducks. These courtyard birds were fed on cereals, legumes, grass and swill. Trace element contents in yolks were generally higher than those in albumen except for Br and Cl. The highest content of Ca in yolks was in Guinea fowl. Cl concentration was highest in chicken yolk. The concentration of K was highest in Guinea fowl yolk, and Na contents were highest in duck yolk. Mg was seen only in the chicken eggs with the higher concentration in the yolk than in albumen. The results provide baseline measurements of trace mineral contents of eggs and suggest measurable differences amongst the eggs from chicken ducks and guinea fowls; these differences are discussed in details.
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Guinea fowl
Fowl
Egg albumen
Trace Minerals
Trace Minerals
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An attempt was made to form a heterologous guinea fowl-domestic fowl radiation chimera. Young guinea fowls exposed to whole-body irradiation with doses of 830 to 1200 r were given a therapeutic dose of chicken embryonic spleen cells. The results showed that this treatment is ineffective, evidently because the mechanism of death is not the same in birds as tn rodents, in which a similar therapeutic system proved very satisfactory. The temporary erythrocyte chimerism found in three guinea fowls exposed to sublethai irradiation did not affect their immunological reaction to the donor species. (auth)
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Heterologous
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The length of rapid growth phase of ovum in the guinea fowl was estimated by the number of colored rings of the yolk of eggs obtained after daily feeding with Sudan Red 7 B and Sudan Black B alternatively at a definite time of each day. The length of the rapid growth phase ranged from 7 to 11 days. It was 8-10 days in one third of the birds, and in about two third of which it was 9 days. The diameter of the yolk of boiled eggs was about 3 cm, and a little smaller in the yolk showing 7 or 8 rings than in that showing 9 or 10 rings. The daily increment of yolk mass, calculated on the basis of radius of the colored ring, was greater in the yolk showing a lesser number of rings. It increased from day to day, but showed a plateau during the last 3 days in the yolk of 8 or 9 rings, or during the last 4 days in the yolk of 10 or 11 rings.
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Fowl
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Guinea fowl
Fowl
Gallus gallus domesticus
Cholinesterase
Meleagris gallopavo
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