Resumen

VARGAS-LEITON, Bernardo; MARIN-MARIN, Yamil  y  ROMERO-ZUNIGA, José. Bioeconomic  comparison of breed types  Holstein, Jersey and Holstein×Jersey in Costa Rica. Agron. Mesoam [online]. 2012, vol.23, n.2, pp.329-342. ISSN 2215-3608.

The objetcive of this work was to compare the bio-economic performance of Holstein, Jersey and F1 Holstein×Jersey cattle from  the Premontane Wet Forest lifezone in Costa Rica. According to the model, an average Holstein cow produces  448 and 1393 kg of  milk per year above the F1 or Jersey cow, respectively. An average F1 cow produces 24 and 115 more kg of milk solids than  the Holstein or Jersey cow. On an average herd with 80 adult cows,  the F1 is expected to produce 3863 and 382 kg more kg of milk solids than Holstein or Jersey. An  average Holstein herd is expected to produce 667  and 1468 more kg of meat per year than an F1 or Jersey herd. The expected annual income for an F1 herd is  US$20644 and US$34434 higher than a Holstein or  Jersey herd. The expected  annual  cost  for  the  F1  herd  is  US$3697  and US$10848 higher than a Holstein or Jersey herd. Expected gross margin  for the F1 herd is  US$16946 and US$23586 higher  than  a  Holstein  or Jersey  herd.  Expected  benefit/ cost ratio for the F1 herd was  0,10 and  0,15 higher than a Holstein or Jersey herd. Variables with positive  significant effects  on  benefit/cost  ratio  were  the   production  level, lactation length, fat and protein content, cows/milkmen ratio and  herd  size. Variables  with  negative  significant effects on benefit/cost were days open, base salary for agricultural workers and price of concentrate.

Palabras clave : simulación estocástica; cruces lecheros; modelo bioeconómico; stochastic  simulation; dairy   crosses; bioeconomic model.

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