Some effects of reaction (pH) changes in a basaltic soil on the mineral composition of growing crops

✍ Scribed by J. W. B. Stewart; S. McConaghy

• Publisher: John Wiley and Sons
• Year: 1963
• Tongue: English
• Weight: 877 KB
• Volume: 14
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/jsfa.2740140903

✦ Synopsis

deficient birds treated with pituitary extract each laid an egg every day for at least 5 days after the first injection, although egg production by the calcium-deficient controls had virtuaUy ceased at this stage.

Conclusion

It may be concluded from this experiment that the cessation of egg production which occurs when hens are fed a calcium-deficient diet, is due to a failure of gonadotrophin secretion by the anterior pituitary. This mechanism serves to protect the skeleton from excessive depletion and it appears likely that, in birds susceptible to laying paralysis, this mechanism is relatively insensitive.

References