Effect of evaporative cooling and altitude on dairy cows milk efficiency in lowlands

Kód výsledku v IS VaVaI

RIV/60076658:12220/19:43899764 - isvavai.cz

Výsledek na webu

https://link.springer.com/content/pdf/10.1007%2Fs00484-019-01828-5.pdf

DOI - Digital Object Identifier

10.1007/s00484-019-01828-5

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of evaporative cooling and altitude on dairy cows milk efficiency in lowlands

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Effect of evaporative cooling and altitude on dairy cows milk efficiency in lowlands

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

QK1910438: Snížení aplikace antibiotik využitím ekologicky šetrných prebiotických a probiotických krmných aditiv ve výživě telat

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

International Journal of Biometeorology

ISSN

0020-7128

e-ISSN

—

Svazek periodika

64

Číslo periodika v rámci svazku

listopad

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

"433–444"

Kód UT WoS článku

000498005200001

EID výsledku v databázi Scopus

2-s2.0-85075376386