author(s)
Shiv Kumar, Harish K Gulati, Harish Rohila and Sushil Kumar

abstract
A study was conducted on 24 Murrah buffalo calves of either sex between 6 to 9 months of age at animal Farm, LUVAS, Hisar during the summer season from July 15, 2015 to October 15, 2015 (90Days). Experimental calves were divided into four treatments having six animals in each treatment viz. Loose housing system + 100% feeding level (T1), Loose housing system + 120% feeding level (T2), Conventional barn housing system + 100% feeding level (T3) and Conventional barn housing system + 120% feeding level (T4). There was significantly higher (p<0.05) temprature and temprature humidity index in conventional house than loose house. The analysis of variance revealed that there were significant (P<0.05) difference in dry matter intake per kg body weight gain between loose house and conventional barn housing system. It is higher in conventional barn housing system that mean animals in conventional barn required more dry matter to gain 1 kg body weight as compared to loose house. Corresponding to that same as dry matter (DM), crude protein (CP) and total digestible nutrient (TDN) requirement per kg body weight gain is also higher in conventional barn housing system. There were no significant effect of feeding level on feed conversion efficiency. Higher feed conversion efficiency in loose house may be due to a comfortable environment to the animals in reference with the low temperature and low temperature humidity index in a loose house as compared to conventional barn housing system.