The aim of every dairy cow herd owner is to maximise the milking yield.
For a breeder that invests in high-yielding dairy cows, milking yield losses will largely result from the maintenance of improper barn temperature in summer. The most comfortable environment for cows is from 12°C to 18°C. However, the accepted principle is that barn temperature should be at most 10°C higher or lower than outside temperature.
Although cows easily bear low ambient temperatures, down to -10°C, at temperatures above 25°C they are exposed to thermal stress. Thermal stress effects include: reduction of the milking yield by up to 30%, lower protein and fat content in milk and lower reproduction statistics. Correct and effective building insulation is crucial for maintaining high production profitability also in summer.
THERMANO AGRO boards, with the low lambda of 0.023 [W/mK] and special aluminium coatings, perfectly protect the barn interior from high temperatures. In thermal stress, animals are apathetic, move slower, eat less and drink more. The impact of heat waves on milking yield reduction is particularly apparent in highest-yielding cows that have an increased metabolism due to their high milking yield.
When the ambient temperature increases to 30°C, cows consume 1.5 kg less dry weight and yield 3-5 kg less milk per day. An increase of body temperature also increases rumen temperature, which inhibits the growth processes of the microflora that is necessary for milk production.
High temperatures have an adverse impact on feed quality. Heated feed causes reduced resistance and mild toxin poisoning in cows, which lowers the fat content in milk. Thermal stress also causes worse liver functioning, thus reducing the synthesis of resistance proteins. In connection with the accumulation of free radicals, it leads to a significant reduction in resistance. Thus it is considered that thermal stress significantly increases the susceptibility to limb and udder inflammation, lameness, bearing retention, as well as metabolism diseases and maw displacement. Thermal stress also causes outward movement of more blood from the inner body (to dissipate heat), which disrupts the functioning of intestines and the absorption of nutrients.
High barn temperatures have an adverse impact on reproduction. The abnormalities are caused by a negative energy balance (lower feed intake), as well as the impact of heat on the reproductive system. Less energy means reduced secretion of the LH hormone that is responsible for ovarian follicle maturation and ovulation.
Immature follicles produce less estradiol, contributing to less intense estrous cycle symptoms and poor mating results. The disruption of the hormone balance lowers embryo quality, while uterus overheating causes embryo mortality.