Heritabilities and genetic trends for productive and reproductive traits of the new breed Mambi de Cuba were estimated in two regions: Matanzas (M) (42 981 lactations and 20 371 calving intervals) and Havana (H) (4 114 lactations and 3 654 calving intervals), in a period of 18 to 26 years. The MTDFREML program was applied using a single-trait Animal Model including the fixed effects (herd-year-4 month period and lactation order or parity) and the permanent environment effect. Estimates of heritability of M y H were: total milk yield .17 .01 and .19.00, lactation length .07 .01 and .09 .03, calving interval .05 .01 and .07 .03. The genetic trends for total milk yield in cows was similar in both regions (3.50 and 4.97 kg/year) while for bulls was lower in Havana (1.65 kg/year). In spite of difficult economic conditions the genetic gains in this breed were positive which can be improved if the progeny tests are restored.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.46, 2006
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