DOI: 10.36871/vet.zoo.bio.202008005
UDC 57.021: 57.017.5
Authors
M. S. Lodyanoy
Candidate of Biological Sciences, Associate Professor,
Nizhny Novgorod State Agricultural Academy,
Nizhny Novgorod, Russian Federation
A. I. Erzutov
Graduate student, Nizhny Novgorod State Agricultural Academy,
Nizhny Novgorod, Russian Federation
Abstract
As a result of research and production experience in the economy of the Nizhny Novgorod region,
the effect of three-time administration of the drug «Selenopiran» at a dose of 300 mg during the
dry season on the ease of calving, milk productivity and reproductive functions of cows was studied.
For this purpose, two groups of cows (n=10) were selected: an experimental group and a control group.
Starting from the confirmation of 6-month pregnancy, 25% oil solution of the drug «Selenopiran» at a
dose of 30 ml was administered three times at intervals of 5–6 days to animals of the experimental
group. 14 days after last injection from experimental and control animals were taken blood samples
for haematological study determined the red blood indices: the number of red blood cells and hemoglobin,
white blood: white blood cell count and leukocyte formula, and lysozime and bactericidal activity
of blood serum. Further, the animals were monitored both during calving and postpartum period,
and during subsequent artificial insemination and lactation, the duration of independent and manual
separation of the afterbirth, the frequency of occurrence, form, duration of the course and outcome of
specific diseases of the postpartum period (endometritis and early mastitis) were recorded.
Fruitful insemination was determined based on the results of rectal studies. Based on these
observations, the main indicators of herd reproduction were calculated, i.e. the insemination index
(the number of inseminations per 36 fruitful), the duration of the period and the interbody period.
As a result, the service period in the experimental group decreased by 113,7% relative to the control
animals (178,2 days versus 2,3), the insemination index also improved in the experimental
group – 3,8, against 1,6 in the control group. The average daily milk yield in the experimental group
is 2,9 kg higher, and the live weight of calves at birth is XNUMX kg. A comparative analysis of hematological
parameters of experimental and control cows obtained a higher level of markers of nonspecific
immunity in the experimental group. Consequently, along with relatively rapid recovery of
reproductive organs and shortening of the service period, the cows of the experimental group also
had higher indicators of non-specific resistance compared to the cows of the control group.
Keywords
dry period, selenium, reproduction, insemination index, service period.
