The Influence of Cooling on Milk Yield and Composition in High-Yielding Cows

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12220%2F18%3A43898283" target="_blank" >RIV/60076658:12220/18:43898283 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
The Influence of Cooling on Milk Yield and Composition in High-Yielding Cows
Original language description
The study aimed to evaluate the effect of high temperatures on milk production of dairy cows. The hypotheses that milk yield is influenced by the evaporative cooling (fogger and fan) was tested. Production data included 227,500 test-day records belonging to 34 Holstein breed herds situated in lowlands (115 m to 150 m above sea level) and kept in free-stall housing. Herds were allotted into groups according to the manner of cooling. The first group of cows (19 herds) was cooled using evaporative and mechanical ventilation; the second group (15 herds) was cooled using only mechanical ventilation (automatically controlled fans in housing and feeding areas). During the period from May to September, 36 summer and 22 tropical days were recorded, 37 days had a mean temperature-humidity index (THI) value above 72.0, while on 34 days we recorded mean THI values above 78.0. Dairy cows cooled by fans with water foggers produced significantly more milk than cows cooled only with forced ventilation (9,650.4 kg vs 8,528.0 kg; P<0.001). Fat and protein production differed also significantly (364.0 kg vs 329.5 kg, P<0.001; 312.2 kg vs 279.7 kg, P<0.001). It can be concluded that heat stress can cause significant production reduction. We can justify that fan+spray cooling being better than fans only.
Czech name
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Czech description
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Type
D - Article in proceedings
CEP classification
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OECD FORD branch
40201 - Animal and dairy science; (Animal biotechnology to be 4.4)

Project
<a href="/en/project/QJ1530058" target="_blank" >QJ1530058: Creating a system for evaluation of biosecurity, welfare and health of farm animals for the production of health friendly foodstaffs of animal origin</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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