DEVELOPMENT OF BLACK-MOTLEY HEIFERS FROM BIRTH TO 9 MONTHS OF AGEBY DIFFERENT FEEDING LEVELS AND HOUSING CONDITIONS
DOI:
https://doi.org/10.32636/10.32636/agroscience.2025-(4)-3-7Keywords:
heifers, growth and development, feeding level, housing conditions, microclimateAbstract
The indicators of the main body measurements of heifers in the control and experimental groups were almost the same, indicating that the inclusion of WMR into the main diet of the animals did not negatively affect their growth and development. An analysis of the morphological indicators showed that the level of erythrocytes and the degree of their hemoglobin saturation in heifers of all groups were within the physiological norm. There was also no significant difference in total protein content between the groups.
It should be noted that the heifers in the control group surpassed those of the experimental groups by 3.8% and 5.3% respectively at 3 months of age, while at 9 months, the live weight of the animals in the control group was 2.6% higher compared to the experimental groups. Heifers from both the control and experimental groups met the breed standard. The replacement of whole milk with WMR in their diet while compensating for energy with a mixture of concentrated feeds did not negatively affect the growth of the young animals.
Since animals spend a greater amount of time indoors, it is necessary to create an environment with optimal microclimate parameters that positively influences their productivity and health status. Using a psychRometric hygrometer VIT-1, it was found that the air temperature in the room where the calves were kept during the study period (spring) ranged from 16 to 21ºC, while the relative humidity fluctuated between 68 to 75%. Using the Dozor-S-M-5 device, the presence of CO2 was detected in the air of the livestock building. Its concentration in different parts of the room varied, being highest in the middle section at 0.18–0.19%, which does not exceed the maximum allowable standards
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