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Sattorov, F. R., Rakhimov, U. T., & Abdikhalilov, A. S. (2022). Dependence of
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Web of Scholars: Multidimensional
Research Journal
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1
(6), 11-13.
UDC: 338:636
Level of feed consumption by milk productivity in experimental cows in the second
lactation
U.T.Rakhimov
-(PhD),
R.G.Pardayev
-(PhD),
E.G.Pardayev
-student.
Samarkand State University of Veterinary Medicine, Animal
Livestock and Biotechnology
Abstract. In the research, it was found that the milk yield of Holstein cows depends on the
live weight at the first calving, and the cows with a live weight of 481 kg and above at the first
calving have high milk yield, and the milk amount of the cows of the experimental group III in
the II lactation 465.3 kg (P>0.99) and 256.5 kg, milk fat output 15.6 kg (P>0.999) and 8.4 kg,
milk protein output 14.9 kg (P>0.999) and 8.0 kg, 4% milk was 389.3 kg (P>0.999) and 209.9
kg higher.
Also, studies have shown that the degree of milk coverage of cows depends on milk yield,
and cows of experimental group III with high milk yield produce 1 kg of milk of natural fat
content compared to cows of experimental groups I and II, respectively, 0.05 feed units and
0.02 feed. unit, and for 1 kg of 4% milk used 0.99 feed units and 0.04 feed units or 3.8 percent
compared to the equivalent price; spent 0.02 feed units or 1.9 percent less.
Key words: breed, Holstein, cow, milk, feed, herd, live weight,
Annotatsiya. Tadqiqotlarda golshtin zotli sigirlarning sut mahsuldorligi birinchi
tug‘ishidagi tirik vazniga bog‘liqligi aniqlangan va birinchi tug‘ishida tirik vazni 481 kg hamda
undan yuqori bo‘lgan sigirlar yuqori sut mahsuldorligiga ega bo‘lganligi va ularning II
laktatsiyada III tajriba guruhidagi sigirlarining sut miqdori I va II tajriba guruhlaridagi
tengqurlarinikidan tegishlicha 465,3 kg (P>0,99) va 256,5 kg, sut yog‘i chiqimi 15,6 kg
(P>0,999) va 8,4 kg, sut oqsil chiqimi 14,9 kg (P>0,999) va 8,0 kg, 4%-li sut 389,3 kg
(P>0,999) va 209,9 kg yuqori bo‘ldi.
Shuningdek tadqiqotlar sigirlarning ozuqani sut bilan qoplash darajasi sut
mahsuldorligiga bog‘liqligi va yuqori sut mahsuldorligiga ega III tajriba guruh sigirlari 1 kg
tabiiy yog‘lilikdagi sut ishlab chiqarish uchun I va II tajriba guruhlaridagi sigirlarga nisbatan
tegishlicha 0,05 ozuqa birligi va 0,02 ozuqa birligi, 1 kg 4%-li sut uchun esa 0,99 ozuqa birligi
sarfladi va tengqurlpriga nisbatan 0,04 ozuqa birligi yoki 3,8 foiz; 0,02 ozuqa birligi yoki 1,9
foiz kam sarfladi.
Kalit so‘zlar: zot, golshtin, sigir, sut ,ozuqa,poda, tirik vazn,
Relevance of the topic.
To increase the production of livestock products in our republic,
it is of great practical importance to fully use the genetic potential of breeds in terms of
productivity, to increase it, to strengthen the feed base, to create productive herds of cows, and
to improve breeding work. In increasing the efficiency of milk production, the degree of milk
food consumption of cows is of particular practical importance and shows the efficiency of
using cows in a dairy herd. Studying the level of milk productivity of cows with different live
weights and evaluating the parameters of feeding with milk is considered one of the most
important and urgent tasks. The study of this index of the productivity of cows in relation to the
live weight at the first calving is also of great scientific and practical importance.
294
Research location and methods.
Researches were carried out in Holstein cattle herd of
the "K-Eldor" breeding farm in the Pastdargom district of the Samarkand region in cows of this
breed in the 2nd lactation. 15 cows with a live weight of 460 kg at first calving were selected
for experimental group I, 461-480 kg for experimental group II, and 481 kg or more for
experimental group III. The amount of milk, fat in milk, live weight and physiological condition
of the cows was organized taking into account the type of feeding of the cows. Productivity
indicators of cows during lactation were studied by methods generally accepted in zootechnics.
Research results.
Table 1 shows the milk yield of cows in II lactation.
Table 1
Milk yield of cows in the II lactation of experimental groups (n=15)
Indicators
Groups
I
II
III
X±Sx
C
v
, %
X±Sx
C
v
, %
X±Sx
C
v
, %
Milk quantity, kg
4740,2±92,6 7,31 4949,0±104,6 7,91 5205,5±113,5** 8,16
Fat in milk, %
3,91±0,03 2,54
3,89±0,03
2,75
3,86±0,04
3,61
Milk fat yield, kg
185,3±2,8 5,58
192,5±2,95
5,73
200,9±3,43***
6,44
Protein in milk, %
3,54±0,03 3,17
3,53±0,02
2,12
3,51±0,02
2,13
Milk protein yield, kg 167,8±2,12 4,72
174,7±1,86
3,98
182,7±1,54***
3,15
4 % milk
quantity, kg
4633,5±65,6 5,30
4812,9±74,9
5,83 5022,8±86,5***
6,50
Live weight, kg
497,1±5,48 4,13
523,3±6,74
4,82
552,4±6,70
4,54
Dry matter, %
12,41
12,39
12,35
Skimmed dry milk
residue, %
8,66
8,66
8,65
Milk sugar, %
4,50
4,50
4,50
Note : * *(P>0.9 9 ) * **(P>0.9 9 )
In table 1 shows that in II lactation, the amount of milk of cows in experimental group III
was 465.3 kg ( P >0.99) and 256.5 kg, milk fat yield 15 .6 kg ( P >0.999) and 8.4 kg, milk
protein yield 14.9 kg ( P >0.999) and 8.0 kg, 4% milk 389.3 kg ( P >0.999) and 209.9 kg was
high.
When evaluating the effectiveness of using cows in a dairy herd, their feed consumptive
for milk has a special place. We studied the degree of milk coverage of cows in lactation I in
experimental groups (Table 2).
Table 2
Feeding of cows in lactation with milk products to cover
characteristics (n=15)
Indicators
Groups
I
II
III
Every 1 head of lactating cow spent food unit, kg
4788,2
4865,2
4996,3
Amount of milk, kg
4740,2
4949,0
5205,5
4% - milk quantity, kg
4633,5
4812,9
5022,8
1 kg natural to milk production spent feed unit , kg
1,01
0,98
0,96
Used for 1 kg of 4% milk food unit, kg
1,03
1,01
0,99
Every 100 feeds to the unit work released:
natural in fat milk, kg
99,0
101,7
104,2
4% - milk, kg
96,76
98,92
100,5
It can be seen from the data of Table 2 that even in II lactation, cows of experimental
group III were superior to cows of experimental groups I and II in all parameters. For example,
295
cows in experimental group III used 0.96 feed units to produce 1 kg of natural milk and 0.05
feed units and 0.02 feed units for 1 kg of 4% milk compared to cows in experimental groups I
and II. spent 99 feed units and 0.04 feed units or 3.8 percent compared to the equivalent price;
consumed 0.02 feed units or 1.9 percent less but produced 104.2 kg of milk per 100 feed units
and produced 5.2 kg and 2.5 kg more milk than cows in experimental groups I and II
respectively
Conclusion.
Cows in the experimental groups showed a high degree of consumptive of
feed with milk products, which, in turn, is expressed by the efficiency of their use in milk
production in dairy herds.
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