Rat Fat Research Articles

The Absorption and Retention of Carotene and Vitamin A by Hens on Normal and Low Fat Rations: One Figure

The Absorption and Retention of Carotene and Vitamin A by Hens on Normal and Low Fat Rations: One Figure

The Intake and Output of Fat by the Hen on Low Fat and Normal Ration

BALANCE studies of various dietary factors have been conducted with the chicken as the experimental subject, but scarcely any consideration has been given to the intake and output of fat by this species. Guntherberg (1930) has reported on the digestion of the fat of cereals by hens. The object of the present investigation was the determination of the intake and output of fat by the laying and non-laying hen on normal and low fat rations, to determine the effect of the deprivation of fat on egg production, and the extent to which the chicken can synthesize fat for egg production.EXPERIMENT 1This experiment was planned to determine the relation between egg production and the fat consumption and output when a normal ration is fed. Throughout the paper the word “fat” is used for convenience instead of the term crude fat or ether extract, which was actually determined. Also the .

A METHOD OF ASSAYING THE POTENCY OF ANTERIOR PITUITARY EXTRACTS WHICH INCREASE LIVER FAT

It was observed by Best and Campbell (1) that anterior pituitary extracts were capable of producing an increase in the liver fat of fasting rats. In order to study the purification and properties of the active material from the glands it was decided to seek a suitable method of assay. Further work showed that, for this purpose, mice were more suitable than guinea pigs, rats or chickens (2). In the present paper a mouse assay of the substance or substances which are present in anterior pituitary extracts and which cause upon injection an increase in liver fat is described. The coincident effects of the extracts on liver glycogen and the resistance to insulin are also shown. The term ‘liver fat’ refers to the amount of fatty acids plus unsaponifiable fats determined by the direct saponification method described previously.