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Heat Stress and Its Effects on Dairy Cows
Release time:
2020-04-29
Lodge licking brick magnesium element can prevent heat stress. Magnesium is an effective activator in the rumen of dairy cows, which can maintain normal rumen flora, protect rumen health, participate in nerve regulation and calcium and phosphorus together, promote rumen peristalsis, regulate yin and yang ions, prevent heat stress, balance rumen PH value, and improve feed conversion rate.
Heat stress in dairy cows (Dairy Heat Stress) refers to the sum of a series of non-specific physiological responses of cows to the thermal environment. The reason why cows are afraid of heat mainly comes from the following two points: First, the cow has many sources of heat. A large amount of heat is released in the process of rumen digesting food and converting feed into milk, followed by poor heat dissipation in dairy cows. Cows have large body weight, small body surface area per unit weight, and underdeveloped sweat glands. Heat stress in cows is mainly caused by the combined effect of temperature, humidity, wind speed and solar radiation in the external environment. The heat stress of dairy cows will bring serious economic losses to the pasture, in order to better understand the heat stress of dairy cows, reduce the loss of pasture and prevent and control the heat stress, this paper expounds the cows under the influence of heat stress.“Special”of change.
The changes of dairy cows under heat stress can be summarized as the following three aspects:“Temperature rise, milk drop, restlessness, dyspnea”, respectively introduced as follows:
“temperature rise milk drop”Refers to the increase in body temperature and decrease in milk production in cows. The heat production and heat dissipation of dairy cows under heat stress are unbalanced, and the excess heat accumulation in the body leads to the increase of body temperature of dairy cows. The body temperature of a cow usually refers to the core body temperature of the cow. Studies have shown that the critical value of body temperature for cows under heat stress is38.8~39.0 ℃That is, when the body temperature exceeds the critical value, the cow is under heat stress.
At the same time, under the state of heat stress, the milk yield of dairy cows will be significantly decreased, and the relationship between body temperature and milk yield can be found that every increase in body temperature0.55 ℃Decreased milk production.1.8kg.
“fidgeting”Refers to the effect of heat stress on the distribution of standing, walking and lying time in dairy cows. When the weather is hot, we tend to be restless and restless, and the same is true for cows. The normal lying time of the cow is10-14Hours/Days, that is, the cow will use half a day to lie down, the length of lying time can be used to reflect the comfort of the cow. Studies have shown that heat stress leads to an increase in standing time and a decrease in lying time, from no heat stress to moderate heat stress, and the proportion of lying time (lying time/18hours) from51.3%reduced42.3%, standing time correspondingly from45.9%Elevated55%. This is mainly because standing will increase the contact area between the cow's body surface and the external environment, which is more conducive to the cow's heat dissipation through the body surface.
“upset asthma”Refers to the effect of heat stress on the heart rate and respiratory rate of dairy cows. At present, there are different opinions on the effect of heat stress on the heart rate of dairy cows. Part of the conclusion is that heat stress has a significant effect on the heart rate of dairy cows, However, there are also some claims that there is no specificity in the heart rate of cows, that is, the heart rate of cows will rise in the short term, and the heart rate will drop due to the adaptation to the environment when suffering from long-term heat stress. Breathing rate refers to the number of times a cow breathes in one minute. Under the influence of thermal stress, the cow takes away the heat in the body by increasing the number of breaths. The cow's breathing rate under normal conditions is20Times/min, mild heat stress50~60Times/min; moderate heat stress80~120Times/min, severe heat stress120~160Times/min.
The hot climate environment in summer and autumn is easy to cause heat stress in dairy cows, and the occurrence of the disease has caused huge economic losses to the dairy farming industry in China. Dairy farms (households) must improve the awareness of heat stress prevention and control, specifically from two aspects: one is to improve the external environment of dairy cows, such as physical cooling of dairy cows, supply sufficient drinking water, adjust feeding time and improve health management level, etc.; the second is to carry out nutrition control for dairy cows, such as adjusting the diet structure and improving the supply rate of energy feed and green feed, adding a certain amount of Chinese herbal medicine or stress relief additives in the diet,IncreaseLick brickThe free lick of food,Rocky Lick BrickMagnesium can prevent heat stress.MagnesiumIt's milkThe effective activator in the rumen of cattle can maintain the normal rumen flora, protect the health of the rumen, participate in the joint action of nerve regulation and calcium and phosphorus, promote rumen peristalsis, regulate yin and yang ions, prevent heat stress, balance the rumenPHvalue to improve feed conversion rate.
Lodge Lick Brick is imported products. Lodge licking brick production process has reached the international leading level. It has been sold in more than 50 countries around the world.
Phosphorus-rich RockyLick bricks, also known as "pregnancy-promoting Rocky", are specially designed and produced for breeding livestock, especially in the high-yield period of dairy cows, phosphorus, calcium, zinc, magnesium, iron, cobalt, iodine, manganese, selenium, sodium and other minerals The interaction of trace elements plays a very important role in improving the health index, reproduction rate and milk yield of dairy cows, and will affect the final profit and return.
phosphorus rich rocky lick brick significant efficacy:
1: Solve the problem of maternal reproduction (for example, long interbirth time, repeated mating infertility, frequent abortion)
2: extend the peak period of lactation; improve milk production.
3: Extend the life of the female animal; (one annual output8,000 liters of cows lost in their milk production60 kg of minerals)
4: Improve the comprehensive health index of dairy cows and reduce the incidence of dairy cows (e. g. mastitis, hoof disease).
5: Cow pica disappears (gnawing wood,Licking hair,Licking urine,gnawing plastic), with smooth fur.
6: to promote food digestion, improve feed utilization, saving concentrate.
Physical cooling
Install awnings in dairy barns, or raise the roof. Installing fans in summer dry milk houses to relieve heat stress can significantly improve their subsequent milk production and health. The milking parlor is second only to the area to be milked by heat stress, to consider the cows, but also consider the milker. This area is mainly ventilated and cannot be sprayed.
Pay attention to the prevention and treatment of cow diseases
Do a good job in the cattle house environmental hygiene, adhere to regular inspection, injection of epidemic fever vaccine, to ensure the health of cows.
Adequate drinking water
In the hot weather of summer and autumn, the amount of drinking water for cows is normal.1.2-2.0Therefore, in the high heat environment, we should try to provide sufficient clean and sanitary drinking water for the cows.
Strengthen the management of feeding
Design a diet for summer cows and improve feeding management, increase feeding times, such as recommended feeding in areas with severe heat stress.4～6times, every2Hour material pushing1Times.
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