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Efficient milk production under heat stress condition

Published: September 19, 2016
By: Dr. Israel Flamenbaum / Cow Cooling Solutions, Ltd, Israel
Heat stress is now considered to be the cause of the largest economical loss to the world’s dairy sector. The reasons for this are global warming, the increase in milk output per cow and the “immigration” of dairy sectors from temperate to tropical and sub-tropical regions, where the demand for milk in most cases is increasing.
 
Heat stress negatively affects the global dairy sector along the production, processing and commercialization chain.
 
At dairy farm level, heat stress negatively affects the cows in all stages of lactation (including dry cows):
 
  • Milk production efficiency is reduced due to the negative effect heat stress has on the cow’s annual production, the reduction in milk fat and protein content and an increased milk SCC.
  • Reproduction efficiency: the cow’s conception rate is negatively affected, which leads to seasonality in calving rate and in the milk supply to the market. It also leads to an increase in calving interval, above the optimal level.
  • Animal health: heat stress leads to an increase in health disorders.
  • Feed efficiency is affected when the cow’s energy demand for maintenance increases (more feed required to produce determined amount of milk).
 
A lot of research has been done in the last decades, mostly in intensive dairy sectors located in warm regions, in order to develop effective systems to mitigate heat stress in dairy cows, trying to adapt them to different climate zones and dairy farm types.
 
In the dry regions of the world, and where farms require closed buildings (due to very cold winter conditions), “indirect” cooling systems (cooling the air around the cows) have been developed. These systems are based on the evaporation of water inside the building, created by high pressure misters or evaporative pads. Lowering the air temperature allows cows to loose more heat through convection means.
 
In humid regions (where most cows in warm regions are located) where cows are housed in open shelters, a “direct” cooling system was developed, based on a combination of forced ventilation of the cows combined with sequences of short wetting periods of the cow’s surface. In this treatment, cows loose heat through convective and evaporative means. Cows can be directly cooled in the holding pen (before, and sometimes between milking time) and in the feed line. In addition, cows can be provided forced ventilation in the resting area. According to the studies mentioned above, 6-8 cumulative hours of cooling per day, during all summer days, can increase the cow’s annual milk production and feed efficiency by 5-10% in the summer months.
 
Research and surveys carried out in different warm countries and published recently, compare cow’s performance with and without cooling in the summer. Intensive cooling allows the cows to maintain normal body temperature (< 39.0 C). As compared to non cooled cows, cooled dry and lactating cows increased their milk production by 10% annually, mainly by increasing cows in early lactation “peak” production and mid and late lactation cows persistency. Milk fat and protein content of cooled cows in the summer was 0.4% and 0.2% percentage units higher respectively and their milk SCC was reduced by 100,000/per ml of milk. Intensively cooled cows reached a summer milk production and  content almost equal to that obtained in winter months. Cooling dry cows during summer increased their subsequent lactation, mainly by increasing their “peak” lactation by 5 kg/d.
 
Intensively cooled cows almost doubled their summer conception rates compared to the non-cooled cows, but it was still 10 -15 percentage units lower that those obtained in the winter.
 
Cooled cows required less feed energy for their maintenance, a fact that leads to a 10% improvement in their summer feed efficiency (kg feed required to produce 1 kg of milk).
 
Based on these results, economical studies were recently carried out to evaluate the costeffectiveness of the implementation of cooling means in different farm conditions. These studies took into account on one hand the cost of cooling (installation and operational cost, as well as additional feed required for the extra milk produced) and on the other hand, the economical benefits due to cooling the cows (additional milk produced, improved milk fat and protein content, doubled regular summer heat detection and conception rates and improved feed efficiency).
 
Under all examined conditions (farms in different climates, different farm types and different prices for feed, energy and milk), most of the cooling expenses were covered almost completely by the improvement in feed efficiency. When all the economical benefits were taken in account, per cow net annual profit was increased by more than 20% above that obtained in farms that did not cool their cows in the summer.
 
In addition to its economical value, heat abatement by cooling the cows also has other beneficial aspects, which have become increasingly important in the last decades, namely the improvement in animal welfare and environmental sustainability
 
Heat stressed cows tend to spend more hours standing and crowded, which reduces rumination time (as consequence of reduce activity and feed consumption). Cooled cows, although “being obliged” to spend more time per day standing (when being cooled), tend to spend more hours per day laying down and ruminating, two main symptoms related to improvement in cow welfare.
 
Increased production per cow allows the production of the same amount of milk with less cows and replacement heifers, saving maintenance costs and reducing Green House Gases (GHG) mainly methane, emission to the atmosphere. Therefore, cooling the cows in the summer, in spite of its use of electricity for fan operation, can also be considered “environmentally friendly”, as it reduces total GHG emission in the milk production process.
 
In conclusion, heat stress abatement, through cooling the cow, in any convenient system improves cow’s performance and farm profitability, improves animal welfare and at the same time, helps lessening the impact on the environment by reducing GHG emission to the atmosphere per unit of milk produced.

This article was originally published at Milkproduction.com
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Authors:
Israel Flamenbaum
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Israel Flamenbaum
12 de octubre de 2016
Hello Philip You are right in your observation and it will be better use crossing in case you can't provide cows with good feeding , housing, veterinary care and effective cooling. Anyhow, my experience in these same tropical regions is that, once you manage giving all these factors, then HF is able to manifest its potential and be superior over other breeds or crosses.
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Hassan Khan
4 de octubre de 2016

Well, this varies depending upon the conditions and humidity and also on the ability of the animals beyond which it cannot be tolerated and the animals feel under stressed, where its production go down day by day.

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Israel Flamenbaum
3 de octubre de 2016
Dear Rajesh, I have very poor knowledge on cold stress. Hopefully, one of the members can answer your question
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Israel Flamenbaum
3 de octubre de 2016
Fat (by pass usually) can be a good mean to supply the cow with more energy when suffering from heat stress. If cow is properly cooled, then the amount of fat in the diet can be reduced significantly, to the level provided in cooler days
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Israel Flamenbaum
1 de octubre de 2016

Thanks Aziz for the warm words.
To all members, you can see in another article of mine published in Engromix (Summer to Winter ratio Index) that there are dairy farms in Israel who reach same milk production per cow in summer as in winter (above 40 kg/cow/day) without any manipulation in feeding, just intensive cooling!!!
These farms also double summer conception rate, as compared with non cooling farms.

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Israel Flamenbaum
1 de octubre de 2016

To the question of the friend from Indonesia:

The combination of wetting with forced ventilation works the same goodin dry as in warm and humid climates. I have farmes usin this system in South China, Vietnam, El Salvador and other tropical regions of the worls with very good results in overcoming heat stress negative impact on pure Holstein cows.

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Israel Flamenbaum
29 de septiembre de 2016

I think that Dr. Mukesh Sharma is missing the point from the principal message of my article
Cows can be cooled easily, in a cheap manner and all kind of climate and management to reduce great part of the negative impact of hear stress on the cows. I think that this issue must be the basic one to be discussed. Obvious, if you don't or can't cool the cows, then you must manipulate feeding and maybe genetics, but this is always more expensive and less effective than just cooling the cows, also in very extensive and small dairy farms in countries like India and Pakistan.

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Shifali Sharma
20 de junio de 2019
Heat stress is now considered to be the cause of the largest economic loss to the world’s dairy sector. The reasons for this are global warming, the increase in milk output per cow and the “immigration” of dairy sectors from temperate to tropical and sub-tropical regions, where the demand for milk in most cases is increasing.
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PRADEEP BHATIA
BIOGOLD INDUSTRIES
1 de enero de 2017

Heat stress condition can be reduced by using active energy molecules cattle feed supplement from plant extracts.

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Rajeshwaran
10 de noviembre de 2016
Acidosis directly stems from excess feeding of grains. The better alternative is to reduce the ill effects of high temperature by cooling of the body by just spraying water on the body three or four times between 11 to 4 pm with a gunny sack on the torso. Reduce exposure to radiation heat in these timings. Crossbred cows form less than 25% of total female bovines. Rest 75% are generally unaffected by heat stress.
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