da Costa M J, da Silva R G, de Souza R C
Dept. Melhoramento Genético Animal, FCAV/UNESP, Jaboticabal, SP Brazil.
Int J Biometeorol. 1992 Oct;36(4):218-22. doi: 10.1007/BF02726401.
Thirty-two Polwarth ewes, of ages up to 1 year, were observed in a climatic chamber (24 to 45 degrees C) for eight periods of 5 h each. The observations were made through a window in the chamber wall. All animals were observed four times, then shorn and observed four times again. The animals were given weighed quantities of water and feed consisting of commercial concentrate plus Rhodes grass (Chloris gayana) hay. The water and feed remaining after 5 h of observation were weighed. The following traits were analysed: time eating hay (TEH), time eating concentrate (TEC), time drinking water (TDW), weight of hay eaten (WHE), weight of concentrate eaten (WCE), volume of ingested water (VIW), ruminating time standing up (RTS), ruminating time lying down (RTL), idling time standing up (ITS), and idling time lying down (ITL). Shearing had a significant effect for all traits except ITS. Shearing resulted in higher values for all traits except for ITS and ITL. Ingestion of hay (TEH and WHE) decreased with increased air temperature and humidity, while the ingestion of concentrate (TEC) and WHE) and water (TDW and VIW) increased. Rumination decreased with increased air temperature and humidity, and was higher in shorn than in unshorn sheep.
对32只年龄在1岁以下的波尔华斯母羊在气候箱（24至45摄氏度）中进行观察，每次观察5小时，共进行8次。观察通过气候箱壁上的窗户进行。所有动物均被观察4次，然后剪毛，之后再观察4次。给动物提供经称重的水和饲料，饲料由商业浓缩饲料加罗德草（Chloris gayana）干草组成。观察5小时后，对剩余的水和饲料进行称重。分析了以下性状：采食干草时间（TEH）、采食浓缩饲料时间（TEC）、饮水时间（TDW）、采食干草重量（WHE）、采食浓缩饲料重量（WCE）、摄入水量（VIW）、站立反刍时间（RTS）、躺卧反刍时间（RTL）、站立空闲时间（ITS）和躺卧空闲时间（ITL）。剪毛对除ITS外的所有性状均有显著影响。剪毛后，除ITS和ITL外，所有性状的值均升高。随着气温和湿度升高，干草摄入量（TEH和WHE）减少，而浓缩饲料（TEC和WCE）和水（TDW和VIW）的摄入量增加。反刍随着气温和湿度升高而减少，剪毛羊的反刍时间高于未剪毛羊。
