NationalLibraryOfScotland/medical-history-of-british-india huggingface dataset:
June, 1958 ] V. N. AMBLE, K. S. KRISHNAN AND J. S. SRIVASTAVA 61
2.5—TRANSMITTING ABILITY OF BULLS
For sire evaluation, four characters, viz. the lactation yield, the yield per day of
lactation, the yield per day of calving interval and the lactation period were taken.
Calving interval and the age at first calving were omitted for the present study as
the estimates of heritability for these characters were found to be low (vide Section
3.2). Twelve of the fourteen bulls having six or more daughters with records out
of a total of 36 used in the herd were tested. The transmitting ability of the remain-
ing two sires, viz. Mahmood and Raju could not be evaluated as they were used
mostly on foundation cows whose early records corresponding to those of their
daughters were not available.
2.5.1—Progeny testing
The results of the progeny testing (Table XIX ) indicated that (i) the daughters
of the bull Victory were substantially higher yielders than their dams. The increases
in the average performance of the daughters over their dams were as high as 1,240
lb. per lactation, 3.5 lb. per day of lactation and 2.4 lb. per day of calving interval.
(ii) The daughters of the bull Unique gave a significantly higher average yield
of about 1.7 lb. per day of lactation over their dams. Increases of about 580 lb. per
lactation and about 1.5 lb. per day of calving interval were also registered by the
daughters of this bull over their dams, but these gains were not significant.
(iii) The daughters of the bull Xavier gave higher average yield than their dams
as measured by all the three milk characters, the lactation yield, the yield per day of
lactation and the yield per day of calving interval; but the changes were not signi-
ficant. In this case the variations in the individual daughter-dam differences were
observed to be relatively larger and the average production level of the mates of this
bull was the lowest.
(iv) The daughters of bull Sikandar were substantially poorer yielders than their
dam, the order of fall being about 850 lb. per lactation, 3.2 lb. per day of lactation
and 3.0 lb. per day of calving interval.
(v) The yield per day of lactation period of the daughters of the bulls Hosur
Raj and Erab was significantly lower than that of their dams by about 2.2 lb. and
1.3 lb. respectively. The yield per day of calving interval of the daughters of Erab
was also lower than their dams by 1.8 lb.
(vi) The production level of the daughters of Erio was lower than that of their
dams in respect of all the three milk characters; but none of the differences was
significant at 5 per cent level. The mates of this bull with which their progeny
were compared were also relatively higher yielders compared to the mates of the
other bulls.
(vii) The production levels of the daughters of the other five bulls tested, viz.
Sulaiman, Hosur Gulam, Ziman, Tazman and Warrior were not materially different
from those of their dams.
(viii) The daughter-dam difference in respect of lactation period was not sign-
ficant for any of the bulls tested.
62
STATISTICAL STUDIES ON BREEDING DATA [Vol. XXVIII, Part II,
TABLE XIX
Progeny testing of Sindhi bulls at Bangalore
Serial
No.
1
1
2
3
4
5
6
7
8
9
10
11
12
Bull's name
Victory
Unique
Warrior
Tazman
Xavier
H. Gulam
Sulaiman
Ziman
Erab
Erio
Sikandar
H. Raj
Daughter
dam pairs
3
6
19
7
10
9
12
10
18
23
13
12
6
Lactation yield (lb.)
Average
for
dams
4
3,010
2,901
3,717
3,016
2,369
2,701
2,896
3,050
3,269
3,828
2,946
2,822
Daughter-
dam
difference
5
1,241*
582
17
227
1,318
—97
147
—165
—339
—1,052 @
—852*
—736
S.E.
6
353
480
680
412
814
391
398
364
227
574
381
468
Yld./day of lactation (lb.).
Average
for
dams
7
10.72
9.68
12.70
10.98
9.23
10.66
10.89
11.33
11.62
12.60
12.18
10.15
Daughter-
dam
difference
8
3.50**
1.69*
0.36
0.06
1.43
—0.72
—0.42
—0.83
—1.26*
—2.22
—3.16*
—2.23*
S.E.
9
0.37
0.77
1.24
0.86
1.67
0.92
0.74
0.96
0.49
1.34
1.04
0.84
Yld./day of calving interval
Average
for
dams
10
7.82
6.27
9.33
7.38
5.72
6.48
7.10
6.63
8.13
9.84
7.74
6.83
Daughter-
dam
difference
11
2.42@
1.47
—0.30
1.22
1.09
—0.86
—0.47
—0.70
—1.79**
—2.32
—3.04*
—1.80
S.E.
12
1.05
0.88
1.96
1.29
1.75
1.05
0.99
0.56
0.63
1.77
1.21
1.28
Lactation period (days)
Average
for
dams
13
270
280
289
265
236
245
258
249
278
295
230
272
Daughter-
dam
difference
14
42
23
12
27
77
5
—7
19
—8
—48
—13
38
S.E.
15
31
35
26
27
53
23
23
20
15
33
24
48