Showing papers in "Poultry Science in 1935"

TL;DR: A series of papers by Pearl and Curtis (1909-12) form a basis for most of our textbook material on the subject of egg formation in the domestic hen as discussed by the authors.

TL;DR: The method presented in this paper consists of a manual elicitation of an ejaculatory response which is undoubtedly reflex in nature and can be obtained in a short period of time.

TL;DR: The lengths of time between fertilization and the first cleavage and the rates at which the early cleavage follow one another may differ decidedly among the eggs of even closely related forms, and are probably fundamentally connected with differences in chemical structure of the egg substances.

TL;DR: It is found that feeding hens dessicated thyroid caused them to lay smaller eggs, the effect on the yolk being most consistent, but the effect in this case persisted for only about a week after thyroid feeding was discontinued and is probably not to be compared with the effect produced by substances such as alcohol.

TL;DR: A review of shell structure studies can be found in this paper, but no such review has been published to date, and no such study has been conducted in the last few decades.

TL;DR: Buckner, Martin, and Peter as mentioned in this paper showed that the causal factor for the deposition of calcium on the egg was a mechanical one, and they sutured the large intestine to the oviduct anterior to the shell gland and found that the faeces were then covered with a calcareous deposit.

TL;DR: In this paper, it has been demonstrated that many chick embryos dying on the eighteenth day of incubation or later and examined generally on the twenty-second day are not in the normal position for hatching.

TL;DR: A brief report on the effect of age on the egg production and hatching results of Bronze turkey females during the period 1927 and 1933 inclusive and some data are presented on the comparative mortality and rate of growth of the progeny.

TL;DR: In this paper, a discussion of two such statistics, based on two distinct points of view regarding the kind of information to be extracted from a given set of data, together with methods for computing valid estimates of their standard errors are presented.

TL;DR: It was decided to raise chicks to maturity by feeding them affected grains, and then if possible, secure hatchable eggs, in this way the question of unknown stock would be removed.

TL;DR: If species in which the female is heterogametic, as is the case in the domestic fowl, also show greater male mortality, then the hypothesis of harmful sex-linked factors must be abandoned.

TL;DR: The results of the investigations of Hughes and his associates found that ultra-violet irradiation had a markedly beneficial effect on the production and hatchability of eggs and that the quantity of vitamin D stored in the egg could be affected by diet, as well as by ultra-V Violet irradiation of the chickens.

TL;DR: The extensive use of milk products and leafy green plants such as alfalfa in the poultry ration indicates that poultrymen have found them essential, but the underlying cause of the benefits derived from these products was not understood until recently.

TL;DR: The purpose of this paper is to demonstrate the application of variance analysis, a suitable, accurate method of analyzing the data of chick nutrition experiments, and to show its application in poultry nutrition experiments.

TL;DR: Martin and Insko (1934) have shown that in White Leghorn females good fertility was maintained up to seven years of age, although the groups of birds representing different ages were not strictly comparable since there was some selection each year.

TL;DR: In the experiment reported herein, the distribution of embryo mortality in turkey eggs has been determined and compared with that of the fowl and found that embryo mortality of the common pigeon, ring dove, and wild dove, when plotted on a comparable basis with those of chickens, showed the same patterns.

TL;DR: Unpublished data from the Pennsylvania Experiment Station indicate that the antirachitic requirement of growing turkey poults and game birds—vitamin D requirements is higher than previously thought.

TL;DR: A study on the digestibility of Argentine flint corn was conducted in this article, where the authors found that it is the hardest grain that can be used to any extent in animal feeding.

TL;DR: It is concluded that the removal of the preen gland from adult birds caused a disturbance of the feather growth and an impairment of general health, while in young birds its removal caused rickets, in spite of normal feeding and sunshine treatment.

TL;DR: A large number of hen’s eggs at different stages of incubation and with various dosages are rayed in an effort to ascertain more clearly the destructive as well as the stimulating qualities of Roentgen rays.

TL;DR: In this article, the effect of modifying the calcium-phosphorus ratio of three rations for poults by adding certain calcium salts at levels to contribute 0.8 percent and 1.6 percent calcium respectively is included in this report.

TL;DR: Eleven farms were visited during the spring and summer of 1932 and 1933 and eggs were secured from each for studying the storage quality, with average daily temperature 90 to 100°F.

TL;DR: The results of one phase of a group of experiments and observations to determine the causes of malposition in chick embryos at hatching time show that early orientation might affect hatching position.

TL;DR: Eggs have been studied as a source of vitamin A and are among the animal products now receiving increased attention concerning variations in this vitamin due to ration, breed, season and rate of production.

TL;DR: Work at this Station and at other stations has shown specifically that the annual egg record depends upon a number of inherited characteristics and upon environmental influences.

TL;DR: In the randomized block agronomic experiment, the land to be used is divided into a number of blocks which in turn are subdivided into small plots of the same shape and of equal size as mentioned in this paper.

TL;DR: It is suggested that the usual period of 5 to 6 weeks used in vitamin D assay involving the chick could be reduced materially because a very wide spread in bone ash between chicks receiving no vitamin D and those receiving an ample supply is obtained as early as the second week.

TL;DR: Keenan, Kline, Elvehjem, Hart and Halpin have shown not only that chicks may be grown on a simplified diet, but suggests that vitamin B4 is a potent factor for their growth, in both of these important contributions, liver has been fed as one of the main supplements.