Resumo em Inglês:

Two 50 R. I. R. chicken groups were contrasted, both receiving the same basic-ration differing only in the content of wheat bran or corn cobs meal. One ration had 10% of wheat bran and in the other one the 10% of wheat bran has been substituted by 10% of corn cobs meal. It was found on the final weight a significant advantage of 12,8% with wheat bran. However, the development of chikens receiving corn cobs meal was quite normal.

Resumo em Inglês:

The data reported in this paper are in accordance with the hypothesis previously established (2) of the interaction of a main pair of alleles as controlling the inheritance of black, blue and blue-splashed plumage in chickens received from the State of Goias, Brazil. The black plumage is relatively uniform but the blue and blue splashed plumages indicate the action of other genes regulating the lack of uniformity.

Resumo em Inglês:

The effect of "Capastrol", pellets of diethilstilbestrol at 0,015 g., in 12 weeks S. C. W. Leghorn cockerels, was studied. The results secured are in accordance with those obtained by other authors and can be resumed as follows: 1) paleness and shrunken of the comb, whose size is reduced, in comparison with the controls; 2) no differences in the total weight gain between control and treated lot; 3) size of testis greatly reduced in treated males; 4) improvement of meat by fat deposition in chickens that received treatment.

Resumo em Inglês:

This paper deals with experiments on the yolk color of chicken eggs. The results obtained can be summarized as follows: a) no differences were observed when different breeds (S. C. W. Leghorn and Rhode Island Red) were fed whith the same ration: yellow corn grains or green feed. b) 30% of yellow corn grain (orange or yellow) in the ration are sufficient to give satisfactory color to the yolk eggs.

Resumo em Inglês:

Two groups of 51 one day chickens were placed on a diet in which 10% of corn meal in the ration has been substituted by cane molasses. It was found that in the diet with cane molasses the chickens had a better development and the difference was found to be statistically significant. Since corn meal is more expensive than cane molasse, that substitution is recommended.

Resumo em Inglês:

Four years of inbreeding and its effects on fertility, hatchability, viability and egg production in the new bred "PPPP" (Pescoço Pelado Preta Piracicaba) (naked neck and black plumage, Piracicaba) were reported in this paper. It was observed a decrease in fertility, hatchability, viability and egg production as the inbreeding increases. The black plumage naked neck homozygozous chickens are now submitted to a system of uncontrolled mating in the hope that the natural selection will reduce some of the undesirable factors providing abundant material for pedigree control.

Resumo em Inglês:

The author proves that equation, Σy n ΣZx | ΣxyZx ΣxZx ΣxZ2x | = 0, Σy ΣZx Σy2x | where Z = 10-cq and q is a numerical constant, used by Pimentel Gomes and Malavolta in several articles for the interpolation of Mitscherlih's equation y = A [ 1 - 10 - c (x + b) ] by the least squares method, always has a zero of order three for Z = 1. Therefore, equation A Zm + A1Zm -1 + ........... + Am = 0 obtained from that determinant can be divided by (Z-1)³. This property provides a good test for the correctness of the computations and facilitates the solution of the equation.

Resumo em Inglês:

The photometric determination of ascorbic acid with the "E. E. L. portable colorimeter" can be carried" out rapid and conveniently using either 3% HPO3 or 0,4% (COOH) 2 as protective agent. The standards would contain from 2 to 20 micrograms of ascorbic acid per ml of metaphosphoric or oxalic acid solutions. We mix 10 ml of these solutions with 3 ml of the adequate citrate buffer solutions, and we pipet 5 ml of the resulting mixture to a matched test tube containing 5 ml of sodium - 2,6 - dichlorobenzenoneindophenol (80 mg per liter); then we shake well and after 15 seconds the extintion is read using green filter. The readings are subtracted from the blank one. Designating the differences by x and the concentrations of ascorbic acid/ml in the standards by y, we get, with the acid of the method of least squares, the following regression equations: for the metaphosphoric acid Y = 0,543x + 0,629 for the oxalic acid Y = 0,516x + 0,422, which permit, by interpolating, the determination of the ascorbic acid content in plant materials.

Resumo em Inglês:

A short, report on the chromosomes of three species of Brasilian Orthoptera is given in the present paper. Meroncidius intermedins Brunner, belonging to the Pseu-dophyllidae, differs from the species already studied in the Family in having 30 instead of 34 autosomes and a metacentric sex chromosome. "Of the autosomes, 4 showed to be metacentric. The author believes that the present species may be originated from one having 34 acrocentric autosomes by means of centric fusions. The origin of ths metacentricity of the X is not discussed. Oxyprora flavicornis Redtb.,belonging to the Copiphori-dae, has spermatogonia with 29 chromosomes. Of the autosomes, 4 seemed to be metacentric. The X has the form of a V of subae-qual arms. Neoconocephálus injuscatus (Scudd.), also belonging to the Copiphoridae, is provided with secondary spermatocytes of 13 -j- X and 13 chromosomes. The heterochromosome is metacentric. In the spermatogonia, whose chromosome number has not been counted, there are a lot of metacentric elements. In the opinion of the present writer species provided with 31, 33 and 35 chromosomes should exist in the Copiphoridae.