Международная научно
-
практическая конференция
«ПЕРСПЕКТИВЫ КРОЛИКОВОДСТВА: ПРОБЛЕМЫ И РЕШЕНИЯ»
207
EXTERIOR PARAMETERS OF HOLSTEIN-BREEDING COWS OF
GERMAN BREEDING
Kholjigitov Askar Marifjonovich, Yangiboyev Abdimalik Eshmurodovich
Samarkand State Veterinary Medicine, Tashkent branch of the University of
livestock and Biotechnology Department” Zooinjenery and silkwork"
, x.f.f.d., (PhD)
Abstract:
Little variation was observed between the div sizes of the cows in the
experiment. For example, the fat height of cows in experimental groups I and II was 3.3
cm or 2.5% (P<0.05) and 7.8 cm or 5.7% (P<0, 05), wither height by 2.5 cm or 1.8% (P<
0.05) and 5.4 cm or by 3.8% (P<0.05), chest width by 1.8 cm or 2, 93% (P<0.01) and 2.2
cm or 4.2% (P<0.05), breast depth 1.2 cm or 1.7% ( P<0.01) and 2.7 cm or by 3.7%
(P<0.01), chest circumference by 3.9 cm or 1.9% (P<0.01) and by 5.4 cm or 2.6% (P<
0.05), the oblique length of the div by 0.8 cm or 0.5% (P<0.01) and 2.6 cm or 1.7%
(P<0.05), the width of the hind femur by 0.7 cm or 1.9% (P<0.05) and 1.8 cm or 3.4% (
P<0.05) and leg circumference 0.2 cm or 0.9% and 1.6 cm or 6.9%.
Keywords
div dimensions, hip height, chest width, chest circumference, leg
circumference. hind femur, oblique length of the div, elongated div structure,
tallness indices.
Enter
In increasing the milk yield of cows, complete nutrition is important in
increasing the production of milk products. Because when such feeding is
provided, dairy cows are provided with nutrients, minerals, vitamins and other
important elements required for the div, which in turn helps to maintain their
health, div strength, it is important in increasing resistance to various factors,
improving fertility and increasing milk yield. Such opinions can be seen from the
conclusions made by many authors based on the results of their research.
Products of well-digested animal husbandry, is considered extremely important
in human evolution to meet the demands of humans on the earth for livestock
products. Fulfillment of this factor is primarily carried out at the expense of
improving the productivity and quality of livestock products, feeding livestock
and improving the breed. Purpose
of the research is
to improve the main
economic characteristics and productivity characteristics of Holstein cows
imported from abroad in the conditions of the Tashkent region by increasing the
amount of the feeding ration by 10-15%. is to learn the secret.
Research results and analysis
The study of external indicators of dairy cows is considered important in
determining their productivity trends and evaluating constitution types. We
studied the div size of cows in experimental groups at different feeding levels,
the results of which are shown in Table 1
Международная научно
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практическая конференция
«ПЕРСПЕКТИВЫ КРОЛИКОВОДСТВА: ПРОБЛЕМЫ И РЕШЕНИЯ»
208
As can be seen from the data in Table 1, there was a slight difference
between the div sizes of the experimental cows. For example, the fat height of
cows in experimental groups I and II was 3.3 cm or 2.5% (P<0.05) and 7.8 cm or
5.7% (P< 0.05), wither height by 2.5 cm or 1.8% (P<0.05) and by 5.4 cm or 3.8%
(P<0.05), breast width 1.8 cm or 2.93% (P<0.01) and 2.2 cm or 4.2% (P<0.05),
breast depth 1.2 cm or 1.7% ( P<0.01) and 2.7 cm or 3.7% (P<0.01), chest
circumference 3.9 cm or 1.9% (P<0.01) and 5.4 cm or by 2.6% (P<0.05), oblique
div length by 0.8 cm or 0.5% (P<0.01) and by 2.6 cm or 1.7% (P<0.05), femur
width by 0.7 cm or 1.9% (P<0.05) and 1.8 cm or 3.4% (P<0.05) and calf
circumference by 0, 2 cm or 0.9% higher and 1.6 cm or 6.9% higher.
These obtained data indicate that the bodies of cows in experimental groups
I and II are well developed.
Analysis of the data in Table 2 shows that cows in experimental groups
I and II have slightly larger bodies than cows in group III, which is 0.8 and 2.8%
of their long-leg index, respectively, compared to cows in group III. got a high
score. We can also see from the elongation index that cows in all groups have
almost the same level of elongated div.
Elongation div composition index of cows in experimental groups I and
II had a lower index of 2.3 and 1.7%, respectively, compared to that of the same
cows in the control group.
The exterior of dairy cows is important in creating productive herds of cows
with high milk production. Cows that are proportionate in appearance are usually of
the milk type and are prolific. It is important to study the features of the exterior in
determining the positive correlation between the exterior of cows and milk yield, and
based on the obtained results, it is of great practical importance for breeders to
improve the selection of their exterior according to acceptable features.
Table 1
Body dimensions of first-born cows in the experiment during the 90-day
lactation period, cm
Body dimensions
Groups
Basic Ration +10%
Group I
Main ration +15%
Group II
Basic ration
Group III
X
±
S
x
C v, %
X
±
S
x
CV, %
X
±
S
x
CV,
%
Height at withers
136, 3
±1.7
6
4.87
131, 8
±1,
76
4.06
128,5
±1.2
7
2.82
Height at sactum
18,5
±1
. 41
4.5 5
135, 6
±
1,5 7
3.95
133,1
±1,
41
2.88
Chest width
52,1
±
0,45
6,7 5
51, 7
±
0, 5 3
5,7 1
49.9 ±
0,4 2
6.35
Chest depth
71,9
±0,
49
7.46
7 0, 4
±0,
5 3
6.0 1
69,21
±
0, 41
6.9
Chest circumference
208,9
±
1,87
3.1 3
207,4
±
1, 62
4.0 5
203,5
±
1,1 1
4.7 3
The oblique length of
the div
152 3
±
0.5 9
3.9 6
150,5
±
0, 48
2.7 7
149,7
±0.8
6
3.94
Posterior femur width
51.7 ±
0,5 5
11.09
50.6 ±
0.58
8, 7 1
49,9
±
0,4 6
9.37
The circle of the train
22, 9
±
0.38
3.40
2 1, 5
±0.4
0
2,21
21, 3
±0.3
7
2.07
Note: *P<0.05, **P<0.01
Международная научно
-
практическая конференция
«ПЕРСПЕКТИВЫ КРОЛИКОВОДСТВА: ПРОБЛЕМЫ И РЕШЕНИЯ»
209
According to the data of Table 2, it was found that the div size of the cows
of the I-group was higher than that of the cows of the III- and I- experimental
groups. In particular, the height of the cows in our experimental group I and III is
7.8 and 3.3 cm, the height of the withers is 1.4 and 1.7 cm, and the depth of the
chest is 1.4 and 2..3 cm, chest circumference of 1.7 and 1.6 cm, oblique div length
of 1.7 and 0.9 cm will have high indicators.
The proportional development of the div structure of dairy cows can be
evaluated by analyzing the div indices of dairy cows
Conclusion
The analysis of the div size at birth of Holstein German breeding cows in
the experiment shows that the cows of the I and II experimental groups have a
slightly larger div compared to the cows of the III group, which means that they
are 0.8, respectively, compared to the cows of the III group. and 2.8% had a higher
index of leg length. We can also see from the elongation index that cows in all
groups have almost the same level of elongated div.
Table 2
First-born cows in the experiment, %
Body indexes
Groups
Basic Ration +10%
Group I
Main ration +15%
Group II
Basic ration
Group III
Long-leggedness
47, 2
46,5
46,14
Expansibility
11 1,7
114,1
116,4
Chest
72,46
73,43
72,09
Density
13 7, 1
137,8
135,9
Bony
16, 8
16,3
16,57
Growth
101,6
102,8
103,5
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