A Study of the Physiological Mechanisms Affecting Specific Gravity of Chicken Eggs

Effect of Long-Time Feeding of Certain Arsonic Acids to Chickens

“…It will be recalled that Migicovsky et al (1951) and Ross et al (1952) showed that penicillin improved the uptake of calcium by chicks. Gabuten and Shaffner (1954) found that penicillin increased blood calcium levels in adult fowl. Lindblad et al (1952) reported that dietary aureomycin increased the efficiency of utilization of calcium and phosphorus in young chicks.…”

Effects of Chemicals on Egg Shell Formation

“…Cortisone, which is not known to occur in the fowl, increased shell thickness in one experiment (141) but not in another (142). When the aldosterone anatagonist spironolactone was injected daily at dosages of 4 to 9 mg per hen, shell weight decreased initially by 12 to 24% but then returned gradually to control values (28).…”