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The influence of castration on the growth process and change of plumage in birds

, : The influence of castration on the growth process and change of plumage in birds. Biol. Zbl, 55: 562-571

THIRTY-TWO White Leghorn and Rhode Island cockerels were castrated at 30-40 days. The growth rate of the remiges and rectrices increased in the capons as compared with normal control animals, e.g. in the rectrices of the third generation by as much as 25.2% in one series, 30.2% in another. The greatest difference in the growth rates was noticed in the periods July-September and February-April, when the sexual activity of the cocks is most intense.


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Thexton, A.J., 1974: A modification of the French and Stein neural analog. Swedish abortion statistics for the year 1973 compared with 1972 are discussed. The number of abortions increased 7.8%. 87% of the candidates for abortion were granted abortions. In 1973, 85.4% of the abortions performed were granted by certificat...

Anonymous, 1784: A Case of Painful Menstruation, Attended with Vomiting. London Medical Journal 5(2): 183-186

Landini, P.; Busby, S.J., 1999: The Escherichia coli Ada protein can interact with two distinct determinants in the s70 subunit of RNA polymerase according to promoter architecture: identification of the target of Ada activation at the alkA promoter. Three basic amino acids in region 4 of the RNA polymerase subunit s70 that affect Ada-activated transcription of alkA were identified. The mutation of Lys-593, Lys-597, and Arg-603 to alanine resulted in reduced Ada-dependent RNA polymerase bindin...

Nose, Y.; Komori, K.; Inouye, H.; Nomura, K.; Yamamura, M.; Tsuji, K., 1980: Relationship between hla d and in vitro and in vivo responsiveness to candida albicans allergen. In vitro reaction to C. albicans allergen was studied in 100 normal healthy Japanese and related to HLA. A significant association was found between the low responder group (< 7000 cpm) and HLA-B15 and the high responder group (> 7000 cpm) a...

Murphy Vincent J., 1986: Engineering geophysics; an overview. Pages (unpaginated 1986

Voronkov, M.G.; Rasulov, M.M., 2007: Trecrezan: Progenitor of a new class of adaptogens and immunomodulators. Information on the pharmacological activity of trecrezan - a new domestic adaptogen and immunomodulator are presented. Brief history of the drug creation, its chemical structure, and the immunostimulator and antistressor effects are considered. T...

Bhattarai, A.; Wilczura-Wachnik, H., 2015: Size and diffusion phenomena of AOT/alcohol/water system in the presence of morin by dynamic light scattering. Presented paper is a continuation of our studies on morin interaction with AOT (sodium bis(2-ethylhexyl) sulfosuccinate) reversed micelles solutions in two solvents: ethanol and n-decanol. Now we focused on morin influence on size and diffusion ph...

Kuwata, H.; Ishihara, K.; Kakei, M.; Ohara, S.; Okabe, H.; Hotta, K., 1985: Correlation of quantitative changes of gastric mucosal glycoproteins with ethanol-induced gastric damage in rats. Nihon Shokakibyo Gakkai Zasshi 82(1): 28-33

Bilger A.; Nehlig A., 1991: Regional activity of cerebral energy metabolism enzymes in the developing rat. Archives Internationales de Physiologie de Biochimie et de Biophysique 99(5): A96

Curtin, N.A.; Woledge, R.C., 1975: Energy balance in DNFB-treated and untreated frog muscle. 1. Heat production and chemical changes were measured in untreated and dinitrofluorobenzene (DNFB)-treated muscles during isometric tetani. Levels of total creatine (Ct), free creatine, ATP, ADP, AMP, inorganic phosphate, glucose-1-phosphate, gluc...