American Journal of Applied Science and Technology
145
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VOLUME
Vol.05 Issue 05 2025
PAGE NO.
145-147
10.37547/ajast/Volume05Issue05-30
Growth and Development of Daughters of Holstein
Cows of Danish Selection
Tursunboyev Shokhrukh Bobir ogli
Scientific-research institute of livestock and poultry, independent researcher, Uzbekistan
Received:
31 March 2025;
Accepted:
29 April 2025;
Published:
31 May 2025
Abstract:
The article presents an analysis of the results of scientific research on the growth and development of
Holstein cows of Danish selection.
Keywords:
Holstein cows of Danish selection, 1st generation daughters, female calves, live weight, growth,
development, indicators.
Introduction:
In later years in order to improve the productivity of
the cattle herd in the dairy farms of our republic,
pedigree cattle of various breeds with high genetic
potential are being imported from abroad. As a result,
the weight of pedigree cattle in these farms has
increased, and the milk yield from each cow is
significantly increasing. In particular, farms with a
solid feed base and qualified specialists are achieving
8-9 thousand kg of milk per year from each cow and
80-90 healthy calves from every 100 heads of mother
cattle.
Scientists conclude that the formation of milk
productivity of young cattle replenishing the herd can
be achieved primarily through full-value feeding [4].
Researchers note that Holstein heifers imported from
abroad have demonstrated high adaptability and
growth performance in the conditions of the
Samarkand region, their live weight exceeds the
standard indicators established for the breed, which
will ensure that milk productivity will be at the
required level in the future [1].
Relevance
. The growth and development of Holstein
cows of the first generation, milk productivity, and
the extent to which they can transmit the high
selection traits of their parents to the first generation
daughters have not been studied. Therefore, this
topic is relevant.
In order to study the growth and development of the
daughters of the first-generation Holstein cows, first
imported to Uzbekistan from Denmark, as well as the
degree to which they can transfer the high selection
traits of their parents to the daughters of the first
generation, studies were conducted on the daughters
of cows of Danish selection at the “Sultan” farm in the
Syrdarya district of the Syrdarya region. In order to
bring the live weight of the calves to 360-380 kg at 14-
15 months and artificial insemination, they were
raised using intensive technology. First, the calves in
the experiment were fed specially developed rations
for the summer and winter periods, balanced in terms
of nutrients. This, in turn, ensured the rapid growth
and development of the calves according to the
intensive growth plan.
The ultimate goal was to replenish the herd with
young and productive cattle at the expense of
daughters of highly productive cows imported from
abroad. Those calves this promising It was maintained
with a purpose in mind.
METHODS
In conducting scientific-research, generally accepted
methods in zootechnics were used to determine live
weight indicators. Initially, the growth and
development of female calves were studied. The
increase in live weight of cattle them every three per
month one times on the scales pull to go It was passed
through.
RESULTS AND DISCUSSION
In zootechnical science and practice, the change in
live weight of a young, growing organism is an
important biological process, and one of the research
American Journal of Applied Science and Technology
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American Journal of Applied Science and Technology (ISSN: 2771-2745)
tasks is to study these processes in comparison with
the daughters of cows of different lines. One of the
main tasks is to study and analyze the dynamics of live
weight of female calves in the experiment. Because
the analysis of live weight gain is of great importance
for the rapid growth of female cattle, their early
calving weight reaching 360-380 kg at 14-15 months
of age, their effective artificial insemination, and the
early replenishment of the herd with young
productive cows.
Table 1. The live weight of calves in the experiment increased
driving dynamics, kg (n=15)
Age, month
Experience groups
I
II
III
X̅±Sx̅
C
v,
%
X̅±Sx̅
C
v,
%
X̅±Sx̅
C
v,
%
Average live
weight
at
birth
38.2± 1.56
6.03
38.9± 1.7
6.57
40.1±1.10
4.25
3
105.5±1.64
6.34
104.2±1.9
7.35
103.6±1.58
6.11
6
182.1±2.73
10.5
178.2±2.38
9.21
175.6±2.1
8.12
9
254.1±2.2
8.51
248.1±3.34
12.9
243.1±2.75 10.64
12
321.6±3.58
14.0
313.1±3.5
13.5
306.4±2.8
10.83
15
384.7±3.1
12.0
373.5±3.45
13.4
364.2±3.3
12.8
**( P >0.99)**(P>0.999)
From the data in Table 1, it can be seen that, as a
result of intensive technology, carcasses of various
lines of Danish selection reached a live weight of 364-
385 kg at the age of 15 months. If we analyze by
growth period, although the live weight at birth was
slightly lower, during the experiment, the bodies
belonging to the Oman Justi line in group I, compared
to their peers in other lines, at the age of 6 months,
the average weight of the bodies in the II-
experimental group was 3.89 kg or 2.14% (P>0.99)
higher than the bodies in the III-experimental group,
by 6.49 kg or 3.56% (P>0.99), by the age of 12 months,
the bodies in the II-experimental group were 8.55 kg
or 2.7% (P>0.999) higher than the bodies in the III-
experimental group, by 15.25 kg or 5.0% (P>0.999), at
the age of 15 months, the bodies in the II-
experimental group were 11.22 kg or 3.0% (P>0.999)
higher than the bodies in the III-experimental group,
by 15 months, the bodies in the II-experimental group
were 11.22 kg or 3.0% (P>0.999) higher than the
bodies in the III-experimental group, by 15 months,
the bodies in the III-experimental group were 11.22
kg or 3.0% (P>0.999) higher than the bodies in the II
It gained 20.52 kg or 5.6% (P>0.999) more live weight.
CONCLUSION
It should be noted that Danish Holstein dairy cattle
and their 1st generation daughters can adapt well to
the hot summer and cold winter climatic conditions
of Uzbekistan and, when intensively bred,
demonstrate high daily growth rates in all growth
periods. At the age of calving, i.e. 14-15 months, the
cows will have a live weight of 365-385 kg and can be
effectively artificially inseminated.
REFERENCES
Nurmukhamedova R., Kurbanova Sh., Orzieva D.
Growth indicators of imported heifers // Agro-
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nutrition on the growth and development of offspring
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American Journal of Applied Science and Technology (ISSN: 2771-2745)
2014, p. 36-38.
