GALAXY INTERNATIONAL INTERDISCIPLINARY RESEARCH JOURNAL (GIIRJ)
ISSN (E): 2347-6915
Vol. 10, Issue 5, May. (2022)
1058
CONCLUSION
The features of lactation period of imported Holstein breeds, which are different breeds rather
than geno type species of different
selections, which were obtained
by crossing of black and
white and Holstein breeds.
It should be noted that it is necessary to provide cross-breeding of different breeds with
adequate quality diets and to ensure proper preservation, keeping and management of animals
using effective energy-saving technologies.
THE
LIST OF USED LITERATURE
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breed in hot climates.Dissertation for the degree of D.Sc. in agricultural sciences. Tashkent,
1994, pages 15-20.
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N.Narzullaev, U.Salimova.The productivity of cows of different breeds.
Journal of
Uzbekistan’s agriculture. // 2004. Publication №2. Page 17.
3.
M.H.Dosmuhamedova. Conditions of tolerance to heat and milk productivity of cows with
different genotypes of Holstein breeds.//Zooveterinary 2008. Publication №9,pages 30-31.
4.
A.K.Kakharov, M.K.Narbaeva, Sh.E.Kurbonova, O.A.Mahmadiyorov.Zoocultural and
economic efficiency of animal husbandry in production of Holstein breeds. // “Zooveterinary”
2013. Publication № 1. Pages 46-47.
5.
A.K.Каkhаrоvand others. The milk productivity of Black and white Holstein breed cows. //
“Zooveterinary” 2015. Publication № 6. Pages 30-32.
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J.N. Hujamov. The measures to increase milk productivity of cows of different breeds and
co-breeds. // Dissertation for the degree of D.Sc. in agricultural sciences. Samarkand 2019,
pages 12-14.