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| Articles
by
Khurshid. A. |
Total Records (
1 ) for
Khurshid. A. |
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Khurshid. A.
,
M. Farooq
,
F. R. Durrani
,
K. Sarbiland
and
N. Chand
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The present study was conducted on eggs of Japanese
quail maintained in cages at the research unit, NWFP, Agricultural University,
Peshawar, Pakistan. Five hundred eggs selected at random were broken to
record data on egg weight (g), egg length (cm), egg width (cm), shell
weight (g) and shell thickness (mm). Another 500 eggs were put in the
incubator after discarding undesirable eggs and recording data on egg
weight, egg length and egg width. Egg weight was better predictable from
egg width and length. Following equations were developed to predict egg
weight from egg length and width; (Equation 1) Ŷ= - 3.3133600 + 1.835144(X1)
+ 2.655127(X2), (Equation 2) Ŷ= 1.970096 + 2.252730(X3)
and (Equation 3) Ŷ= - 1.0109318 + 3.616882(X4). Where; `Ŷ
`was predicted egg weight, X1 and X3 the egg length
and X2 and X4 the egg width for every equation separately.
Following equations were developed for predicting eggshell weight from
egg weight, length and width; (Equation 4) Ŷ=- 0.521102+0.310761(X5)
+0.4074 (X6), (Equation 5) Ŷ=0.138189+0.062933(X7)
+0.233078(X8) and (Equation 6) Ŷ=- 0.001150+0.071568(X9)
+0.311496(X10). Where Ŷ was predicted eggshell weight, X5
and X8 were egg length, X6 and X10 are
egg width and X7 and X9 were egg weight (g), respectively.
Shell thickness was predictable with sufficient accuracy from egg weight,
width and length and following equations were developed to predict it;
(Equation 7) Ŷ= 0.154646 + 0.076448(X11) and (Equation 8)
Ŷ= 0.154721 + 0.000694(X12) + 0.073939(X13). Where
`Ŷ ` was predicted eggshell thickness, X11 and X13
the egg width and X12 the egg weight for each equation separately.
Weight of egg albumin was predictable from the following equations; (Equation
9) Ŷ= - 0.685557 + 0.460613(X14) + 0.079842(X15)
+ 0.412241(X16), (Equation 10) Ŷ= - 0.553150 + 0.468198(X17)
+ 0.426649(X18), (Equation 11) Ŷ= 0.279557 + 0.468198(X19)
and (Equation 12) Ŷ= - 2.128934 + 0.925133(X20) + 1.63522(X21).
Where `Ŷ ` was the predicted weight of egg albumin, X14, X17
and X19 the egg weight, X15 and X20 the
egg length in cm and X16, X18 and X21
the egg width in cm for each equation separately. Weight of egg yolk could
be predicted from the following equations; (Equation 13) Ŷ= - 0.618041
+ 0.339520(X22) + 0.156591(X23), (Equation 14) Ŷ=
- 0.303204 + 0.355813(X24), (Equation 15) Ŷ= 0.003214 + 1.141682(X25)
and (Equation 16) Ŷ= 0.050845 + 0.921437(X26). Where, Ŷ was
predicted weight of egg yolk, X22 and X24 were the
egg weight in grams, X23 and X25 the egg width in
cm and X26 the egg length in cm for each equation separately.
Weight of the newborn chick was better predictable from egg weight, width,
length and egg shape index (equation 17). Ŷ = -5.558612 + 0.629504(X27)
- 0.839306(X28) + 1.246874(X29) + 0.050482(X30)
. Where; `Ŷ ` will be the predicted weight of the new born chick, `X27`
the egg weight, `X28` the egg width, `X29` the egg
length and `X30` the egg shape index. The equations developed
for each trait are to be used in the order given to ensure better accuracy
of the results. |
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