Heat hits dry cows

Tasmanian Country - - THE STOCK REPORT -

HEAT stress can cause a dry dairy cow to pro­duce less milk dur­ing her next lac­ta­tion and af­fect her prog­eny for life, re­search from the US shows.

Univer­sity of Florida’s Ge­off Dahl, who has been pre­sent­ing his find­ings at work­shops in Vic­to­ria and NSW, said while the ini­tial ef­fect of heat stress on dry cows was bad, it had a sig­nif­i­cant car­ry­over to their next lac­ta­tion.

“Dry cows can pro­duce five litres of milk per day less dur­ing their next lac­ta­tion if they have been heat-stressed, com­pared to their herd mate who was cooled,” Dr Dahl said.

He said the cow’s im­mune sys­tem was also com­pro­mised.

Calves were born lighter af­ter heat stress and had a lower im­mune sta­tus and Dr Dahl said when that calf ma­tured it also pro­duced about 5L a day less than herd mates and passed that on to its off­spring

That es­sen­tially means one heat stress event can have an ef­fect over three generations.

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.