(1) Data were obtained on hen-day egg production, egg weight, egg mass, egg specific gravity, Haugh units, feed consumption, and feed efficiency.
(2) No significant differences were observed in feed consumption, body weight gain, egg production, egg weight, haugh units, shell deformation, or egg shell thickness between treatments.
(3) Egg weight, egg mass, Haugh units, and feed efficiency were not affected (P greater than .05) by LDC or photoperiod treatments.
(4) Traits analyzed were body weight at 8, 18, 39, and 55 wk of age; shell deformation; Haugh units; egg weights at 32 and 55 wk of age; sexual maturity; egg production; and male fecundity.
(5) There was no effect of waterer type on egg weight or Haugh units.
(6) Values (in Haugh units) were increased by ascorbic-acid supplementation at the 200 ppm level and by the lower relative humidity.
(7) Spur length was negatively correlated phenotypically with egg production, egg weight, specific gravity, and Haugh units.
(8) No significant dietary effects were observed between treatments with regard to body weight at 20 or 64 weeks, age at first egg, egg weight, Haugh score or egg shell thickness.
(9) Egg shell deformation and albumen Haugh values were highest with the complete mash and lowest for the cafeteria system, while the complete mixture was generally between these extremes.
(10) Further, the internal quality (Haugh units) and shell quality of eggs laid by the AIBV-challenged hens was significantly (P less than 0.005) inferior to those from the unchallenged hens.
(11) Albumen weights were not affected, and because the eggs from albinos were smaller, Haugh unit scores were higher.
(12) The plastified eggs and controls were stored under laboratory conditions at 22 degrees C, and the following variables were studied in relation to time: pH of the thick and fluid white, and of the yolk, loss of weight, diameter, yolk index and Haugh units.
(13) In both experiments, injection of cGH did not affect (P greater than .05) percentage of daily egg production per hen, Haugh units, or BW during the injection period compared with preinjection hens.
(14) No significant differences were observed among treatments for days to return to 50% production, hen-day and hen-housed production, egg weight, grams egg per hen-day, grams of feed per gram egg, mortality, or Haugh units during the 22-week experimental period.
(15) At 10 ppm, added V significantly reduced albumin quality as measured by Haugh units; and at 30 ppm and 100 ppm, respectively, significantly reduced rate of lay and feed consumption and also increased body weight loss.
(16) Egg production, hatchability, Haugh units and specific gravity did not differ between lines.
(17) Nicarbazin reduced egg production, depressed egg weight, reduced shell thickness, and caused egg-yolk mottling; but internal egg quality, as measured by Haugh Units, was unaffected.
(18) The addition of KIC and Leu to the hen diets did not affect percentage egg production, egg weight, shell thickness, or Haugh units.
(19) Three ppm V caused a slight decrease in Haugh units, while 6 ppm V reduced Haugh unit score (HU) by 6 to 15 units when fed to hens 29, 44, or 80 weeks old.
(20) Yolk color, Haugh units, hen livability, and reproductive parameters were not different among the dietary treatments.