The Niacin Requirement of the Hen

A Study of the Niacin Requirement of the Laying Hen

“…These results are not in agreement with Ringrose et al (1965) who reported that a daily intake of 0.80 mg. of niacin was needed for satisfactory egg production. The basal ration suppled 602 (Jig.…”

The Availability of Niacin in Corn, Soybean Meal and Wheat Middlings for the Hen

“…The average soybean niacin intake of group SNo was 0.78S mg. per hen per day and the average hatchability recorded was 93.6 percent for the five weeks. Combined data reported by Manoukas (1963) and Ringrose et al (1965) shows that 0.830 mg. of niacin intake per hen per day from a purified diet supported hatchability equal to 83.4 percent during a period of five weeks. This information indicates that 0.785 mg. of niacin could not support 93.6 percent hatchability for a period of five weeks.…”

“…by Ringrose et al (1965), with various levels of crystalline niacin, was fed to White Leghorn hens for at least ten weeks and several variables were studied. It was found that hatchability of eggs was a recognizable linear function of niacin intake over a wide range of intake; thus it was chosen as the independent variable to be estimated in the assay.…”

“…White Leghorn hens were used in all experiments. A description of the niacin deficient diet, experimental design and housing of the hens has been reported by Ringrose et al (1965). The niacin deficient basal diet was adapted to make the assay diets.…”

Improvement of flock productivity through supply of vitamins for higher laying performance and better egg quality

“…Thus, it is obvious, that a dietary supplementation of hens with niacin is necessary. The minimum requirement, indicated by NRC (1994), is 10 mg niacin per kg feed, based on studies by Ingrose et al (1965). In a review carried out by Whitehead (2001) the practical level of supplementation for layers was found to be 50 ppm niacin.…”