The effects of sprinkler plus fan, fish meal or dietary fat on milk yield and milk composition of dairy cows in mid lactation during summer


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Serbester U. , Gorgulu M., Kutlu H. R. , Yurtseven S., Arieli A., Kowalski Z.

JOURNAL OF ANIMAL AND FEED SCIENCES, vol.14, no.4, pp.639-653, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 4
  • Publication Date: 2005
  • Doi Number: 10.22358/jafs/67143/2005
  • Title of Journal : JOURNAL OF ANIMAL AND FEED SCIENCES
  • Page Numbers: pp.639-653
  • Keywords: heat stress, protected fat, fish meal, sprinkler plus fan, cooling, HOLSTEIN COWS, SUPPLEMENTAL FAT, PROTEIN, PERFORMANCE, ENERGY, SHADE, DEGRADABILITY, MODERATE

Abstract

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 hear stress in dairy cows in mid lactation. The studies were carried out in 2 x 2 factorial arrangement, in a 4 x 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 Meal 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.