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The objective of the research was to study effects of feed energy of concentrate relationship with environment on physiological response of dairy heifers. The study used four dairy heifers with four treatments of concentrate energy in latin square design 4x4. The treatments of total digestible energy (TDN) were : P1 (TDN 60%), P2 (TDN 65%), P3 (TDN 70%), and P4 (TDN 75%) with crude protein (CP) 12-15%. The research was carried out for 4 periods consisting of 21 days each period. Variables observed were environment factors such as air temperature, air humidity, THI, wind speed, and solar radiation; physiological response, TDN intake and growth of dairy heifers. Data were analized by variance and regression analysis followed by the LSD for any significant difference among treatments. Results showed that TDN intake for P1, P2, P3, P4 were 3.7, 3.8, 3.7 and 3.7 kg, resvectively. The treatment was no difference on growth of dairy heifers (P>0.05). There was a variation on environmental factors on any periods. The treatments were significant on physiologis response (P<0.01); P4 gave effect of more heat stress than else. Based on the result could be concluded that using feed energy TDN 6570% gave optimum growth of dairy heifers without experience severe heat stress. Combination environment and high feed energy increased heat load to dairy heifers.

Respon Fisiologis Sapi Perah Dara Fries Holland yang Diberi Konsentrat dengan Tingkat Energi Berbeda