מאמר בכתב עת: British Poultry Science

סוג הפרסום: מאמר בכתב עת
פורסם ע"י: אבי רוזנשטראוך , Degen, A., M. Kam
שנת הוצאה: 1992
שם הספר/כתב העת: British Poultry Science
שם המאמר: Effect of restricted cooled drinking water on the performance of broilerbreeder hens in a hot, dry climate
עמודים: 917-924
מספר גיליון: 33

Abstract

  • We tested the effect of cooled drinking water on the performance of broiler breeder hens maintained in a hot, dry climate. Hens from 24 weeks of age (mean body mass = 2.5 kg) were offered one of three treatments: cooled water (18.5°C, COLD) or tap water (27.5°C, CONR) twice a day for a total time of 2–5 h, or tap water ad libitum (CONA). Food was restricted for all hens.

  • Daily water influx in the COLD hens (120 ml/kg) was similar to that of the CONR hens (123 ml/kg), but was 36% lower than that of the CONA hens (163 ml/kg). The same pattern was found in the ratio of water drunk (ml/d) to food intake (g/d): 1.85 and 1.88 in the COLD and CONR hens, respectively, and 2.73 in the CONA hens.

  • There were no significant differences in body mass change among groups. Over the first 28 d of treatment, the COLD hens increased their body mass by 20.9 g/d, the CONR hens by 19.6 g/d and the CONA hens by 21.8 g/d.

  • When offered cooled water from 24 to 30 weeks, egg production decreased in the COLD hens. Egg production in this group was similar to controls during weeks 31 and 32, 1 to 2 weeks after treatment had stopped and at a time that all hens were receiving tap water ad libitum.