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

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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&lt;0.001). Fat and protein production differed also significantly (364.0 kg vs 329.5 kg, P&lt;0.001; 312.2 kg vs 279.7 kg, P&lt;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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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&lt;0.001). Fat and protein production differed also significantly (364.0 kg vs 329.5 kg, P&lt;0.001; 312.2 kg vs 279.7 kg, P&lt;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.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

40201 - Animal and dairy science; (Animal biotechnology to be 4.4)

Projekt

<a href="/cs/project/QJ1530058" target="_blank" >QJ1530058: Vytvoření systému hodnocení biosecurity, welfare a zdraví hospodářských zvířat pro produkci zdravotně nezávadných surovin a potravin živočišného původu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Animal Physiology, Nutrition and Welfare 2018

ISBN

978-80-7394-715-6

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

10

Strana od-do

252-261

Název nakladatele

Jihočeská univerzita v Českých Budějovicích, Zemědělská fakulta

Místo vydání

České Budějovice

Místo konání akce

České Budějovice

Datum konání akce

21. 11. 2018

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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