Ifemiuelry Agrrieulturail E.E[)CI'f}ll0llIt Startion 13
amount of calcium carbonate. Presumably, the carbon dioxid I
in solution in water reaches the shell by diiusion through the
membranes and there forms calcium bicarbonate in solution,
which diffuses back into the contents of the shells. In this
way the growing embryo may obtain the needed calcium above
that already contained in the white and yolk.
Feeding Various Forms of Milk to Laying Hens. The
I feeding experiments with White W5*andottes in which the con-
densed and dried forms of buttermilk were compared with
sour skim milk and meat scrap were concluded this year. The
winter and yearly egg production of the pens receiving con-
densed and dried buttermilk are given in the following table:
Ramon Wd 1:121-22 | 1922-23 iema-24 Q I
(Grain uniform z-I sa ' . :.. bt;.
¤ ma11pens> lg g   Q 
. az 2 if E 5 E   22
4 Mash andlcondensed I I I I I I I
buttermilk .............,......,.... 34 145 I 31 I 102 I 45 163 I 37
5 Condensed butter- I I I I I I
milk only ........................... 40 I 154 I 28 I 88 I 49 I 164 I 39 I
6 Mash with dried I I I I I I  
buttermilk .....,.,...............,. —— —— I 48 I 124   41 I 149 I 45 I
A summary of the three years’ work shows that there is _
no value in the addition of a dry mash of ground grains and
mill feed to a ration of grain and condensed butte'rmilk. This
bears out the previous experimental work in which the addi-
tion of such a mash to a ration of grain and sour skim-milk
proved of no value. If the high protein feed is omitted from
the dry mash, the entire mash may just as well be omitted
from the poultry ration.
A Comparison of the Common Grains as Supplements to
I Skim—IVIilk. The food consumption per hen. for the past two
years, in each of the pens of Barred Plymouth Rocks, compar-
ing corn, wheat and oats in various proportion as supplenn~n1s
to sour skim-milk, together with the winter and yearly egg
production and feed cost, is given in the following table: