Bogor, 16-10-2018       Indonesia Version

 Crossbreeding between PO and Bali cattle was expected to improve viability or to produce animals with combination of good characteristics of the two breeds.

 Crossbreeding between local cattle breeds has been done by farmers in many regions. Crossbreeding between local breeds with improved breeds is an attractive method because the average performances of the population can be improved rapidly, especially for traits with low heritability. The improvement of traits in the F1 crossbreds is due to heterotic effects, though not in all cases. Other advantages of crossbreeding are to enable combination of desired traits and to avoid unprofitable traits.

Crossbreeding in beef cattle in Indonesia, including in East Java, was aimed at improving the quality of beef cattle population genetically. However, the program has not been directed to develop a new breed, but more toward commercial purpose. In beef cattle, crossbreeding program can be based on two, three or more different breeds as the base population. However, three-way crossing has a higher heterosis than two-way cross.

Two-way crossing is expected to improve viability or to produce animals with a combination of good traits from the two breeds. Offspring from crossing between PO and Bali cattle was expected to have higher body weight, higher carcass percentage, good mothering ability, higher fertility, and resistant to various diseases especially Jembrana disease. 

 Crossing between male PO and female Bali cattle was conducted in June 2015. Natural mating was practiced under IAARD Model’ group pen. Pregnancy test using rectal palpation conducted in October 2015 showed 35 Bali cows (58.33%) pregnant, 12 cows dubious or uncertain (20%), and 13 cows (21.67%) not pregnant. 

Parturition occurred between March and July 2016. Results showed some normal birth, abortion, and distochia. Until June 2016, 35 calves were safely born, but 5 of them died. Seven calves were aborted, and 4 calves could not be saved due to distochia and terminated on recommendation of the veterinarian.

The average birth weight of the calves was 21.7 kg. One of the calves had an extremely low birth weight, 12 kg, but it had a short life span between April 14-27 2016. The coat color of the PO and Bali crossbred cattle was predominantly brown mixed with white, 23 calves (65.71%), and white mixed with brown, 12 calves (34.29%). In general, the dominant color was at the body, legs and head; and the minor color was at the head and inner legs.