Open AccessLEVEL OF FEEDING AND THE DYNAMICS OF MILK YIELDS OF AYRSHIRE BREED OF COWS AFTER FIRST CALVING
Author(s) -
O.V. Zelenina,
E.V. Ermoshina,
Maria Gerasimova,
Zarya Jsc
Publication year - 2021
Publication title -
učenye zapiski kazanskoj gosudarstvennoj akademii veterinarnoj mediciny im. n.è. baumana
Language(s) - English
Resource type - Journals
ISSN - 2413-4201
DOI - 10.31588/2413-4201-1883-246-2-81-87
Subject(s) - lactation , ice calving , breed , zoology , dry matter , biology , pregnancy , genetics
Evaluation of the nutritional value of feed mixtures for lactation periods of the Ayrshire first-calf breed showed that in the first period there is an excess of dry matter and easily digestible protein in the diet, and a lack of sugar in all periods. The consumption of energy and nutrients for the synthesis of 1 kg of milk was optimal. For 305 days of lactation, an average of 7653 kg of milk per cow was obtained after the first calving, and the maximum daily milk yield was recorded in the second month of lactation. The research of lactation curves showed that highly productive cows have a more pronounced peak of milk yield in the first lactation months; the level of milk productivity remains high up to 9-10 months of the lactation period.