The effects of sprinkler+fan, fish meal or dietary fat on milk yield and milk composition of dairy cows in mid lactation during summer
U. Serbester 1,   M. Görgülü 1  
,   H. R. Kutlu 1,   S. Yurtseven 1,   A. Arieli 2,   Z. M. Kowalski 3
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University of Cukurova, Faculty of Agriculture, Department of Animal Science, 01330 Adana, Turkey
Department of Animal Science, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76-100, Israel
The Agricultural University of Cracow, Department of Animal Nutrition, Al. Mickiewicza 24-28, 30-059 Kraków, Poland
M. Görgülü   

University of Cukurova, Faculty of Agriculture, Department of Animal Science, 01330 Adana, Turkey
Publication date: 2005-10-17
J. Anim. Feed Sci. 2005;14(4):639–653
Two studies were conducted to evaluate 1. the effectiveness of sprinkler+fan (SF) and fish meal (FM) and 2. SF and protected fat (PF) in alleviation of heat stress in dairy cows in mid lactation. The studies were carried out in 2 × 2 factorial arrangement, in a 4 × 4 Latin square design on four multiparous lactating dairy cows. The treatments in the first trial were 1. no SF and no FM, 2. no SF and 3.67% FM in the diet (on DM basis), 3. SF and no FM and 4. SF and 3.67% FM. The treatments in the second trial were 1. no SF and no PF, 2. no SF and 2.54% PF in the diet (on DM basis), 3. SF and no PF and 4. SF and 2.54% PF. Cows were fed with isoenergetic and isonitrogenic TMR, containing 2.52 Mcal ME/kg DM and 180 g CP/kg DM. The cows received mild heat stress for 9 h (from 07.00 to 10.00 and from 17.00 to 23.00) and moderate heat stress for 7 h (from 10.00 to 17.00) daily for the entire experimental period. SF decreased (P<0.05) rectal and skin temperature and respiration rate. SF improved milk yield for 2.21 kg in the first trial (P<0.07, 19.24 vs 21.45 kg d-1) and 1.22 kg in the second one (P=0.15, 19.47 vs 20.69 kg d-1). FM had no effect on milk yield of neither cooled nor no cooled cows, but tended to increase (P=0.12) milk protein, independently from SF application. Additionally, PF increased FCM and fat yield (P<0.05) and tended to increase (P=0.07) milk fat content independently from SF application. The results of both studies suggest that applying sprinklers plus fan can improve milk yield better than nutritional manipulation using either FM or PF. The results also suggested that PF could be more beneficial than FM under heat stress condition when the dietary protein level is high.
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