Effect of hotly summer in Assiut on health status, productivity and behavior of friesian dairy cattle and the evaluation of traditional ways to relief [electronic resource].

Includes references.

Thirty mid.-lactation Friesian cows, 178 day post-partum were randomly assigned to three equal groups (N= 10 per group). All animals were blocked for age (6 year old), stage of milk yield and average body weight. The experiment was carried out during the months of July and August, 2007 in which the first group of the experimented- animal was left in loose box without shade and expressed to heat stress while the second group was left in shaded box (white galvanized metal roof, 4 meters above the ground and covered about 70% of the yard area). However the later group left in a box supported with shade plus fans (fans were installed regularly at height of 2.4 meters above the ground and spaced 1.5 meters along the manger shed). Our study revealed that provision of shade had no significant effect on temperature-humidity index (THI) while providing shade and fans had significantly lowered THI. At the same time the shade and fans had a significant effect on daily milk production but shade alone had no significant effect on milk yield. Milk yield was slightly increased with shade (insignificant) and tended to be greater for shaded and cooled cows (significant) as compare to non shaded animals.

Summary in Arabic.