TROPICAL GEOGRAPHY ›› 1993, Vol. 13 ›› Issue (4): 314-319.

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THE CORRELATION BETWEEN HOLSTEIN MILK PRODUCTIVITY AND MAIN CLIMATIC FACTORS AROUND GUANGZHOU AREA

Lin Ji-sheng1, Luo Jin-ling1, Wang Qian2   

  1. 1. Institute of Applied Climatology, Guangzhou Meotelogical Centre, 510080;
    2. Guangzhou Intitute of Cow
  • Received:1992-11-01 Online:1993-10-30 Published:1993-10-30

Abstract:

The correlation between the daily milk productivity of 113 lactescent cows around Guangzhou area and some meteorological factors such as daily mean temperature (T),daily highest and lowest temperature(TM and Tm),wet-bulb temperature(Tw),vapor pressure and tempe rature-humidity index (THI) is analysed in this paper. The main climatic factor that influences Holstein milk productivity is high temperature,the optimum and adaptive temperature range in early Iactescent stagC are summaried:
T 15.7℃,10.1~19.4℃;
TM 17.20℃,12.0~24.3℃
Tm 13.2℃,7.9~I8.4℃;
THI 62.0℃,52.7~71.3℃.
If the limit of the adaptive temperature is exceeded,an empirical formula for calculating descending productivity of lactescent cows is suggested:
Tm =0.25 [ΔT+(ΔT-1)2/2],(unit: kg/℃)

Key words: Climate factor, Holsteincow, Milk productivity, Guangzhou