Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Mayhew
1952
Experimental
Mallard
E 12
Eggs from Gibson Game Farm, Route 2, Box 336,
St. Helena, California.
Candling
(4/7/52)
Candling
(3/21/52)Relative No. set Fertile Doubtful Infertile Develop Infertile Develop stopped condition when stopped
Humidity (3/4/52) all stages from "heat spots" To formation of down.
40% 17 10 3 4 3 3 7
65% 12 4 2 6 3 0 3 1 heat spot"
2 dead embryos.
75% 12 8 2 2 6 2 2 2 dead embryos.
85% 11 7 2 2 7 2 0
90% 12 7 3 2 5 2 3 3 dead embryos.
condition of broken eggs
Relative No. Date condition of broken eggs (no weights)
Humidity Hatched Hatched eggs broken open (4/27/52) % of fertile eggs % of fertile eggs that hatch
40% 0 — 0 3 60 50 57 mm; 53.8gms; 98 mm.; 28.7 gms.
101 " ; 33.3 "
65% 0 — 0 3 50
75% 0 — 0 6 67 74; 12.0 91; 25.6 105; 29.5 (picked)
82; 15.5 69; 10.4
85% 0 — 0 7 63 90; 22.8 48; 4.2 50; 7.2 47 mm (partly decomposed)
100; 30.3 88; 22.1 80; 16.6
90% 0 — 0 5 67 102; 24.4 82; 13.7 98; 30.5
95; 40.8 (yolk under inside body) 93; 20.0