Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Mayhew
1952
Experimental Eggs from Russell Thomas, 6030 Blank Road,
Sebastopol, California.
Mallard
E 17
Candling
(4/21/52)
Candling
(4/7/52)
Relative Humidity (3/29/52) No. set Fertile Doubtful Infertile Develop. Infertile Develop. stopped Condition when stopped
40% 14 4 5 8 1 3 4 "heat spots" 52 mm; 5.2 gms.
45 mm; 3.5 gms.
71 " 8.9 "
65% 16 9 3 10 0 2 3 "heat spots" 45 mm; 3.9 gms.
13 "
75% 20 10 6 8 2 6 2 dead embryos (very small) 45 mm; 3 gms.
15 mm.
85% 18 10 5 9 0 6 2 "heat spots" 23 mm. — 9 gms.
2 dead embryos (very small) 1 mm. — 5 ms.
90% 15 7 6 3 1 7 2 "heat spots" 3 mm. 5 mm.
2 dead embryos (very small) 13 " 15 "
1 blood ring 12 "
Relative Humidity No. Hatched Hatch Date % of fertile eggs that hatch % of fertile eggs broken open condition of broken eggs
40% 0 — 0 78 8 (see page E18)
65% 1 4/27 8 75 10
75% 2 4/27 14 70 5
85% 0 — 0 83 3
90% 0 — 0 67 3