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Effect of evaporative cooling and altitude on dairy cows milk efficiency in lowlands
J. Broucek, S. Ryba, M. Dianova, M. Uhrincat, M. Soch, M. Sistkova, G. Mala, P. Novak,
Jazyk angličtina Země Spojené státy americké
Typ dokumentu časopisecké články
Grantová podpora
APVV-15-0060
Agentúra na Podporu Výskumu a Vývoja
NLK
ProQuest Central
od 2003-03-01 do Před 1 rokem
Medline Complete (EBSCOhost)
od 2011-01-01 do Před 1 rokem
Health & Medicine (ProQuest)
od 2003-03-01 do Před 1 rokem
- MeSH
- laktace MeSH
- mlékárenství MeSH
- mléko * MeSH
- nadmořská výška MeSH
- poruchy vyvolané tepelným stresem * MeSH
- skot MeSH
- zvířata MeSH
- Check Tag
- skot MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
The objective of this current work was to determinate the effect of high temperatures on milk production of dairy cows in southern Slovakia in the year 2015. The hypotheses that milk production is influenced by the altitude and cooling were tested. Production data included 227,500 test-day records belonging to 34 Holstein breed herds situated in lowlands, 115 to 150 m above sea level (ASL) and kept in free-stall housing. Dairy farms were classified into groups based on cooling system. The first group of cows (19 herds) was cooled evaporative (foggers) and forced ventilation, and the second group (15 herds) was using cooled only forced 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 thermal humidity index value above 72.0, and on 34 days we recorded mean values above 78.0. The highest milk yields were recorded at the altitude 1 (115 m ASL) (9219.0 kg year-1; 10327.0 kg year-1) and the lowest at the altitude 2 (126 m ASL) (7598.7 kg year-1; 8470.21 kg year-1) (P < 0.001). Dairy cows cooled evaporative milked significantly more milk than cows cooled only with forced air flow (9650.4 kg vs. 8528.0 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 not only heat stress but also location farm above sea level can affect milk production. Evaporative cooling associated with increased air velocity is the appropriate protection against high temperatures.
Ministry of Agriculture and Rural Development of the Slovak Republic Bratislava Slovakia
Research Institute of Animal Production Praha Uhrineves Czech Republic
South Bohemia University Ceske Budejovice Czech Republic
The Breeding Services of the Slovak Republic Bratislava Slovakia
Citace poskytuje Crossref.org
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- $a Broucek, Jan $u National Agricultural and Food Centre, Research Institute of Animal Production Nitra, Hlohovecka 2, 951 41, Luzianky, Slovakia. broucek@vuzv.sk.
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- $a The objective of this current work was to determinate the effect of high temperatures on milk production of dairy cows in southern Slovakia in the year 2015. The hypotheses that milk production is influenced by the altitude and cooling were tested. Production data included 227,500 test-day records belonging to 34 Holstein breed herds situated in lowlands, 115 to 150 m above sea level (ASL) and kept in free-stall housing. Dairy farms were classified into groups based on cooling system. The first group of cows (19 herds) was cooled evaporative (foggers) and forced ventilation, and the second group (15 herds) was using cooled only forced 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 thermal humidity index value above 72.0, and on 34 days we recorded mean values above 78.0. The highest milk yields were recorded at the altitude 1 (115 m ASL) (9219.0 kg year-1; 10327.0 kg year-1) and the lowest at the altitude 2 (126 m ASL) (7598.7 kg year-1; 8470.21 kg year-1) (P < 0.001). Dairy cows cooled evaporative milked significantly more milk than cows cooled only with forced air flow (9650.4 kg vs. 8528.0 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 not only heat stress but also location farm above sea level can affect milk production. Evaporative cooling associated with increased air velocity is the appropriate protection against high temperatures.
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