Environmental Parameters of Cold Season Enclosures and Their Relationships with Body Weight Gains of Barn-Feeding Yaks in Alpine Region of Tibet
In order to deeply understand the relationship between environmental parameters of enclo-sure in the cold season and weight gain of yaks in the alpine region of Tibet,twenty yaks were randomly selected from typical yak farms in Linzhou county,Dangxiong county and Nimu county in Lhasa city for 79 days of Whole house feeding from January to March,and the temperature,humidity,CO2,PM2.5 and PM10 environmental parameters and daily weight gain of yaks in the enclosure were monitored.The results showed that there was significant difference in sheds'temperature and humidity among the three counties during the experimental period.The average temperature and humidity were the highest in Nimu county with 3.96℃ and 38.19%,respectively,Linzhou county temperature and humidity were 1.50℃ and 25.33%,and Dangxiong county temperature and humidity were-3.83℃ and 36.21%.The highest CO2 concentration was found in Nimu county(961.19 mg/m3),followed by Dangxiong county(879.35 mg/m3),and Linzhou county(837.65 mg/m3).The concentrations of PM2.5 and PM10 were the highest in Linzhou county,fol-lowed by Nimu county,and the lowest in Dangxiong county.From January to March,the temperature of all counties showed an upward trend,and the change trends of humidity,CO2,PM2.5 and PM10 concentra-tions were inconsistent.There were significant differences in daily weight gain of yaks among different counties,with Nimu county having the highest(587.91 g/d),flowed by Dangxiong county(321.53 g/d),and Linzhou county having the lowest(262.14 g/d).The regression analysis results showed that the daily weight gain of yaks was positively correlated with the temperature and CO2 concentration inside the cow-shed,but not directly related to humidity,PM2.5 and PM10 concentrations.It can be seen from the above results that improving the cattle shed environment was beneficial to improve yak production performance in the alpine region of Tibet with long cold seasons.
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