A study on productivity of local and imported Friesian cattle raised by small holder farmers was carried out in Pangalengan, West Java. Milk yield was measured at monthly intervals using a 24-hour sampling method. Data on lactation length, calving interval and service period (period between calving and next pregnancy) were also collected. The data were analyzed by a least squares method for unequal subclass numbers. Results of the study showed that milk yields of imported and local Friesian cattle were 4757 +_ 152.5 and 4168 ± 211.2 kg, respectively, and the difference was significant (P < 0.05). Parity (lactation number) v/as an important source of variation for milk yield (P < 0.05), but season of calving was not. The mean of lactation lengths for imported and local Friesian cattle were 303.5 +^8.09 and 321.8 11.2 days, respectively, but the difference v/as not significant. Parity and season were not important sources of variation of lactation length. Calving interval and service period of local an imported Friesian cows are 400.2 + 14.08 and 401.4 + 9.77 days, and 120.4 + 11.77 and 123.7 +_ 8.53 days, respectively, and the difference were not significant. Both calving interval and service period were not influenced by parity and season. The study indicates that imported Friesian have higher lactation yields compared to the local Friesian. Lactation lengths and calving interval were similar for both types of cows. However the calving interval is slightly longer than ideal which suggests that improvement of the productivity both local and imported Friesians could achieve through improved breeding management.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 539–543, 1986
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