This study compared the adaptation traits in common crosses of crossbred dairy cattle in
central Brazil. Twenty animals of each of three genetic groups were used: zebu (Bos
indicus), Simmental x Zebu (SZ) and Holstein x Zebu (HZ). The test measured variations in
rectal temperature (RT), respiration rate (RR) and heart rate (HR) of animals in the shade
and after exposure to the sun, as well as mean daily milk production throughout the lactation
period. The procedure was repeated three times. There were significant interactions …

This study compared the adaptation traits in common crosses of crossbred dairy cattle in
central Brazil. Twenty animals of each of three genetic groups were used: zebu (Bos
indicus), Simmental x Zebu (SZ) and Holstein x Zebu (HZ). The test measured variations in
rectal temperature (RT), respiration rate (RR) and heart rate (HR) of animals in the shade
and after exposure to the sun, as well as mean daily milk production throughout the lactation
period. The procedure was repeated three times. There were significant interactions …